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5-14.

UNLEVELED RF OUTPUT ADJUSTMENTS (Cont’d)

Remove jumpers

A28W1 and A28W2 if they are installed on the A28 assembly. These jumpers

must be removed to

set the V/GHz circuit to 0.5V/GHz.

6.

If the A26 assembly has been replaced, preset the following pots to the position stated (see Figure

5-41):

Set the following fully clockwise:

A26R88 (MO)

Center the following:

A26R7 (BAL)

A26R43 (HET)

A26R45 (Xl)

A26R47 (X2)

A26R49 (X3)

A26R51 (X4)

A26R91 (GAIN)

0.5 V/GHZ ADJUSTMENT

7.

On the OUT, press [CW][1][0] [MHz].

Adjust A28R67 (V/GHz) for a DVM indication of 5 mV + 0.5

mV.

SYTM TRACKING AND UNLEVELED SRO BIAS ADJUSTMENTS

8.

On the OUT,

press the following key sequence:

[STARTFREQ] [6]

[.]

[9] [GHz]

[STOPFREQ] [1] [3]

[.]

[5] [GHz]

[POWERLEVEL] [0] [dBm]
(SWEEPTIME] [2] [0] [0] [msec]
[XTAL]
[SAVE][1]

9.

Connect the

oscilloscope and detector as

shown in Figure 5-40. Set the oscilloscope to A vs B

mode, horizontal sensitivity (CHAN B) to 1

V/Div dc, and vertical sensitivity (CHAN A) to 0.05 V/Div

dc. Adjust the horizontal and vertical position controls to view the entire swept RF output
response on the oscilloscope. Readjust the vertical sensitivity if necessary so that the trace
covers the maximum number of divisions possible.

Band 2 Adjustments

10. Adjust A28R82 (GAIN) to peak the power across the entire band (readjust the scope’s vertical

position and/or sensitivity if

necessary).

NOTE

In the following adjustments, turning the X2A/B, X3A/B, or X4A/B con-

trols clockwise when in the appropriate band will increase the SRD bias
and be closer to the squegging region’. If squegging occurs, turn the

above controls counter-clockwise until the RF output power is reduced

0.5 dB below the squegging region.

1.

The squegging region is an area where undesired oscillations of the YIG sphere or Step Recovery Diode (both internal to the SYTM) are
produced. Symptoms of squegging are power reversal (actual RF output power decreases as selected RF output power is increased), power
holes in the RE output, and spurious responses on the RE output.

5-76

Adjustments

HP 8340B/41B

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Summary of Contents for 8340b

Page 1: ...es Supplement Print Date 18 MAY 1988 Rev 8 Change 1 documents serial number prefix 2634A Change 2 documents serial number prefix 2643A Change 3 documents serial number prefix 2650A Change 4 documents serial number prefix 2730A Change 5 documents serial number prefix 2802A Change 6 documents serial number prefix 2804A Change 7 documents serial number prefix 281 2A Change 8 documents serial number p...

Page 2: ...pping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall payall shipping charges duties and taxes for products returned to HP from another country LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misus...

Page 3: ...duced documents must include the following legend and disclaimer Copyright Hewlett Packard Company HP Reproduced with liP permission Hewlett Packard makes no warranty ofany kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Hewlett Packard is not liable for errors contained herein or for incidental or conseq...

Page 4: ...PROCEDURES SECTION V ADJUSTMENTS Introduction Safety Considerations 5 1 5 1 Equipment Required Adjustment Tools Factory Selected Components Related Adjustments Location of Test Points and Adjustments Accessing and Storing Calibration Constants Introduction Procedure to Access Calibration Constants Procedure to Store the Calibration Constants 5 1 5 2 5 2 5 2 5 2 5 2 5 2 5 3 5 3 5 1 22 VDC Power Sup...

Page 5: ...ment other than that noted in the table may be substituted if it meets or exceeds the critical specifications indicated in the table TEST RECORD Results of the Performance Test procedures may be tabulated on the test record card located at the end of this section Each test lists all of the tested specifications and their acceptable limits The results recorded at incoming inspection can be used for...

Page 6: ...P8340B only 4 41 4 9 Single Sideband Phase Noise 4 45 4 10 Power Sweep Test 4 53 4 11 Pulse Modulation ON OFF Ratio Test 4 55 4 121 Pulse Modulation Rise and Fall Time Test 4 57 4 131 Pulse Modulation Accuracy Test 4 63 4 141 Pulse Modulation Video Feedthrough Test 4 67 4 15 Amplitude Modulation Test 4 71 4 16 FM Accuracy and Flatness 4 75 4 172 HP lB Operation Verification Test 4 83 1 This test i...

Page 7: ...nge Same as DUT Input Impedance 50 Ohms Frequency Accuracy time Base Accuracy 1 count Time Interval Range 100 ns to 200 s Frequency Range HP 8340B DUT 0 01 to 22 GHz HP 8341 B DUT 0 01 to 20 GHz Must have External Time Base Input Center Frequency Accuracy in 0 Hz Span Same asTime Base Accuracy Minimum Resolution Bandwidth 300Hz Residual FM 100 Hz Log Fidelity 1dB Must have Video Output Frequency R...

Page 8: ... HP Part No 00085 15003 For HP 8SF no substitute No Substitute Pulse Width 100 nS Rise Time 10ns Frequency 20 Hz to SO kHz Sinewave Amplitude 1Vrms Sinewave Frequency dc to 5 MHz Frequency Range 100 kHz to 1 3 GHz Gain 20 dB Frequency Range 2 to 20 GHz Gain 15dB 0 to 50 Vdc Voltage Drift in 1 hour 0 1 2 5 mV Frequency Range 1 GHz to maximum frequency of DUT 50 Ohm feedthrough Frequency Range same ...

Page 9: ... Female Type N Male to BNC Female BNC Female to Dual Banana SMB in to SMB in BNC Male Female Female SMB Male Male Male Input Impedance 100 KOhms Output Impedance 50 Ohms For HP 1121A Frequency Range 18 0 to 26 5 GHz Connectors APC 3 5 Female APC 3 5 Male Pass 100 MHz and below Reject 150 MHz and above Negative Frequency Range Same as DUT Peak Inverse Voltage 400V Average Forward Current 750 mA 100...

Page 10: ...djustment slot on components 8830 00242 T Service Cables BNC in to SMB f 2 required SMA in to SMA in Semi Rigid 61mm 2 ft 2 required SMB f to SMB f Delay Line SMA in to SMA in 1 meter 3 ft 85680 600932 08340 201242 5061 1 0222 08503 200382 P P A T T P Nut Driver 9 16 inch to replace front panel BNC nuts 08340 200992 T Wrench 5 1 6 inch slotted box open end 08555 200972 T Notch Filter At least 35 d...

Page 11: ... 2 2 2 2 2 2 2 2 1 P PerformanceTests HP lB HP lB Operation Verification Test A Adiustments T Troubleshooting 2 These parts are included in Service Kit HP Part Number 08340 60134 3 For best accuracy in the Pulse Modulation Rise and Fall Time and the Amplitude Modulation Performance Tests the Local Oscillator drive to the mixer should be 4 dBm The HP 8340A B Option 001 used as the LO will produce 4...

Page 12: ...e fre quency aftera new warmup cycle however in most cases the time base frequency will return to within 1 Hz of the original frequency Specification Table 4 3 Internal Time Base Aging Rate Specifications Description A reference signal from the HP 8340B 41 B under test is connected to the oscilloscope s vertical input A frequency standard with long term stability greater than 1x10 O is connected t...

Page 13: ...t Setup NOTE Be sure the HP 8340B 41B has been connected to the AC power line for 30 days before beginning this test If the instrument was disconnected from the ac power line for less than 24 hours itonly has to be connected to AC power for 24 hours before proceeding Procedure 1 Connect the equipment as shown in Figure 4 1 2 Adjust the oscilloscope external triggering controls for a stable display...

Page 14: ...en Aging Rate i cycle b MHz i 351s i 349s 24h 3h i 3O6x10 11 per day 6 Verify that the aging rate is less than 9 per day NOTE If the absolute frequencies of the frequency standard and the HP 8340B 41B Time Base oscillator are extremely close the measurement time in steps 3 and 4 Ti and T3 can be reduced by measuring the time required for a phase change of less than 360 degrees change 1 cycle in th...

Page 15: ... dividers work normally then CW mode frequency accuracy is essentially guaranteed In the following procedure the test frequencies are selected first to test the maximum frequency range and then to exercise each frequency related circuit throughout its CW range while holding all remaining circuits constant The test frequencies are grouped so that an abnormal indication would point to the circuit mo...

Page 16: ...st Setup 2 Press HP 8340B 41B INSTRPRESET then CW and enter 1 0 MHz Press POWER LEVEL and enter 1 1 0 dBmJ the counter should indicate 10 MHz 1 Hz the resolution of the counter 3 Check the high frequency endpoint FOR HP 8340B Connect the HP 8340B RF output to the 500 MHz 26 5 GHz counter input Press the HP 8340B CW key and enter 2 6 1 5 GHz Press POWER LEVEL 0 dBm The counter should indicate 26 5 ...

Page 17: ...inue this procedure to determine if any other conditions produce an error 5 Check the M N N Divider frequencies as follows a Select a step size of 200 MHz by pressing SHIFT CF 2 0 0 MHz Press CW to display the CW frequency in the ENTRY DISPLAY The CW frequency should be 2 300 000000 MHz b Using the up arrow key step to 6900 000000 MHz Check the counter indication at each step The counter should in...

Page 18: ...tep 6b rather than SHIFT Ml SHIFT M3 will display from left to right the PLL2 VCO frequency and the PLL3 Up Converter frequency the PLL3 UP Converter frequency display will be 0 since the PLL3 is not used in the swept mode d Select a step size of 10 kHz by pressing SHIFT CF 1 0 kHz Press CF to display the center frequency in the ENTRYDISPLAY the display should indicate 2 310S10 GHz e Using the up ...

Page 19: ...uency down to 2 319 870000 MHz Check the counter indication at each step The counter should indicate the DUT CW frequency 1 Hz the resolution of the counter NOTE The above steps set the output of the M N loop to 180 MHz where M 26 and N 13 The PLL1 VCO frequency is stepped up in 100 kHz steps This steps the 20 30 frequency up from 20 03 MHz in 10 kHz steps to 20 13 MHz The M N frequency remains co...

Page 20: ...nter should indicate the DUT CW frequency 1 Hz the resolution of the counter NOTE The above steps program the 20 30 frequency from 21 03 MHz to 29 03 MHz in 1 MHz steps and check the remaining Ni Divider programming bits 8 If frequency errors occurred the instrument requires service To troubleshoot the instrument determine what frequency related circuit is most likely to have caused the symptom i ...

Page 21: ... Counter selected for leading edgetriggering and the count begins At the end of a sweep the STOP SWEEP IN OUT signal changes from TTL high to TTLlow At this point INPUT B is triggered selected for trailing edge triggering and the count is complete After the Universal Counter has made several counts an accurate reading of the DUT sweep time is indicated on its display tiN I VERSAL COUNTER Equipment...

Page 22: ...e that an accurate sweep time indication is obtained from the HP 5316A in step 4 allow the DUT to complete at least three sweeps 4 On the HP 8340B 41B press SWEEP TIME 1 0 msec Verify that the sweep time displayed by the HP 5316A is within the limits shown in Table 4 6 5 Repeat step 4 for values shown in Table 4 6 Table 4 6 Sweep Time Accuracy Limits Selected Lower Limit Upper Limit 10 ms 9 S ins ...

Page 23: ...Division the CRT horizontal axis is now calibrated to approximately 0 5 of the swept frequency range per division The spectrum analyzer VIDEO OUT voltage to the oscilloscope is then maximum and the scope vertical position is adjusted to place the dot near the top of the CRT The HP 8340B 41B can now be set to sweep any frequency range and the oscilloscope center grati cule line will represent the c...

Page 24: ...both AF Mode and Start Stop Mode only Start Stop Mode swept frequency accuracy is tested NOTE The spectrum analyzer resolution bandwidth and DUT sweep time must be compatible to obtain the desired oscilloscope response OSCI LLOSCOPE Figure 4 4 Swept Frequency Accuracy Test Setup 4 22 Performance Tests HP 8340B 41B ...

Page 25: ...z for 80 Set FREQUENCY SPAN to zero Set RES BW resolution bandwidth to 3 MHz 4 Set HP 8340B 41B to have a sweep out voltage and at the same time a phase locked CW frequency that is proportional to a percentage of band as follows a Press START and enter 3 GHz b Press STOP and enter 5 GHz c Press MANUAL SWEEP and enter 3 4 GHz for 20 4 GHz for SO or 4 6 GHz for 800 0 ON Do not adjust the power suppl...

Page 26: ... DUT Spectrum Analyzer Test Limit kHz Start Freq 0Hz Stop Freq 0Hz Sweep Time ins center Frequency 0HZ Res BW kHz 20 of Band 50 of Band 80 of Band 2 3 2 300099 3000 2 3000198 2 3000495 2 300792 0 3 0 99 2 3 2 300101 3000 2 3000202 2 3000505 2 3000808 0 3 l 01 2 3 2 300499 1000 2 3000998 2 3002495 2 3003992 1 0 p4 99 2 3 2 300501 1000 2 3001002 2 3002505 2 3004008 1 0 5 01 2 3 2 30499 300 2 300998 ...

Page 27: ...OWER ACCURACY2 Bands and Approximate Frequency Ranges GHz see Frequency Ranges and Bandswitch Points for complete description Band 0 0 01 to 2 3 Bands 1 3 2 3 to 20 Band 4 20 to 26 5 STANDARD INSTRUMENT 18 to lOdBm3 10 to 9 95 dBm lOto 19 95 dBm 2Oto 49 9Sdbm SOto 79 95 dBm 80 to 100 dBm 0 9dB 1 2dB 1 5dB 1 8dB 2 1 dB 1 8dB 1 5dB 2 0dB 2 3dB 2 6dB 2 9 dB 2 3dB 2 0dB 2 5dB 2 8dB 3 1 dB 3 4 dB OPTIO...

Page 28: ...B 2 4dB 2 7dB 1 9dB 1 8dB 2 3dB 2 6dB 2 9dB 3 2dB OPTION 001 Front Panel Output w o Atten 18 to lOdBm3 1 lOto 10 dBm lOto 20 dBm I 0 6dB 0 8dB 1 0dB 0 9dB 1 5dB rl 4dB 1 3dB 1 9dB OPTION 005 Rear Panel Output w o Atten l8to lOdBm3 lOto lOdBm lOto 20 dBm 0 7dB 09dB 1 2dB 1 1dB 1 7dB 1 6dB 1 5dB 2 1dB 1 Applies only to HP 83408 NOTES 2 Internally leveled AM off The POWER dBm display monitors the act...

Page 29: ...sed to measure the RF signal level An oscilloscope connected to the power meter recorder output is used to find the frequencies where the maximum and minimum points of the response occur The DUT is set to a slow sweep to allow the power meter to respond to any power variations A marker is positioned at the maximum and minimum points on the oscilloscope display The DUT is then set to CW at each of ...

Page 30: ...gnal This RF feedthrough may be visible on the low frequency portion of the oscilloscope trace Also as the power in Band 0 is increased toward maximum leveled the level of the harmonics may increase and cause a perturbation in the swept response This will cause the maximum power indication on the oscilloscope to increase without causing the UNLEVELED indicator to light Therefore flatness is only s...

Page 31: ...inimum swept power point 7 Disconnect the 10 dB pad and crystal detector and connect the Power Sensor to the DUT RF output Set the Power Meter s calibration factor switch to include the frequency noted for M2 To obtain the most accurate Power Meter reading zero the Power Meter on the range being used To zero the Power Meter press the Power Meter RANGE HOLD press DUT RF off zero the Power Meter and...

Page 32: ...n factor switch to include this frequency The power meter indication is the minium power point Record the power meter indication on the work sheet pro vided in Table 4 10 NOTE For Band 0 10 MHz to 2 3 GHz if the minimum or maximum power occurred below 50 MHz use the HP 8481A Power Sensor to measure the power level 15 Press the CONT key to return to the sweep mode Press Ml and using the rotary knob...

Page 33: ... HP 8340B141B Indication Entry Display Step 14 Minimum ______________________________ Step 15 Maximum ____________________________ Step 18 Flatness Maximum Minimum 2 2 dB Standard 2 6 dB Option 004 1 8 dB Option 001 2 2 dB Option 005 Frequency Range 13 5 0Hz to 20 0 0Hz Power Meter HP 8340B141B Indication Entry Display Step 14 Minimum _____________________________ _________________________________...

Page 34: ... be used in the external leveling loop A negative crystal detector HP 8473C is used in this test but a crystal detector may be substituted The HP 8340B 41 B XTAL Leveling mode is selected to verify the instrument s external leveling specifi cation Nine different dBV values ranging from 6 dBV to 66 dBV are selected and the voltage accuracy at the EXT INPUT is checked with a DVM HP 8340B 41B UNDER T...

Page 35: ...tor shunting DVM input Allow the equipment to warm up for one hour NOTE In step 3 XTAL mode is selected In this mode the dB m terminator key selects dBV The dBV value selected corresponds to a voltage at which the DUT s EXT INPUT will be leveled see Table 4 14 The selected dBV is displayed in the ENTRY DISPLAY NOTE If a positive polarity crystal detector is being used for this test the volt ages g...

Page 36: ...ey to select 20 dB of attenuation for Option 001 or 005 instruments remove 10 dB attenuator installed in step 5 and replace it with a 20 dB attenuator 8 Repeat Step 3 for values shown in Table 4 14 Table 4 13 External Leveling Limits With 10 dB Attenuator dBV Selected DVM Indication mV Lower Limit Ideal Upper Limit 30 29 65 31 62 33 70 40 9 24 10 00 10 79 Table 4 14 External Leveling Limits With 2...

Page 37: ... 21 89 l3mV 3 1 413V 29 35 48mV 2 1 259V 30 31 62mV 1 1 122V 31 28 l8mV 0 1 OOOV 39 11 22mV 1 0 8913V 40 10 OOmV 2 0 7943V 41 8 913mV 3 0 7079V 49 3 548mV 4 0 6310V 50 3 162mV 5 0 5623V 51 2 818mV 6 0 5012V 59 1 122mV 7 0 4467V 60 1 OOOmV 8 0 3981V 61 0 8913mV 9 0 3548V 65 0 5623mV 10 0 3162V 66 0 5012mV 11 0 2818V 67 0 4467mV 4 36 Performance Tests HP 8340B 41B ...

Page 38: ...70 64 60 Power line related and spurious due to fan rotation within 5 Hz below line frequency and multiples thereof CW mode only all power levels STANDARD INSTRUMENT Offset 300 Hz from carrier Offset 300 Hz to 1 kHz from carrier Offset 1 kHz from carrier 50 60 65 50 60 65 44 54 59 40 50 55 38 48 53 1 Band 4 applies to HP 83400 only escription he HP 8340B 41B RF output signal is displayed on a spec...

Page 39: ...ur 2 Press INSTRPRESET on the DUT Press the STOPFREQ key and enter 2 3 GHz 3 Press the DUT s POWERLEVEL key and enter 0 dBm 4 Press the CW key and enter any frequency of interest within the selected frequency range S Set up the spectrum analyzer to view the DUT s RF output signal Set the reference level to place the peak of the DUT s RF output signal on the reference level at the top graticule lin...

Page 40: ... analyzer across its full frequency range Look for any spurious signals For each spurious response determine what mechanism generated the spurious response and what specification applies a Is the spurious response in question an integer multiple of the HP 8340B 41B RF output signal If it is the harmonic specification applies b Press the DUT s SHIFT key and then M2 to display from left to right the...

Page 41: ...ous Signals Test 20 to 26 5 GHz Specifications SPURIOUS SIGNALS Expressed in dB relative to the carrier level dBc at ALC level of 0 dBm Bands and Approximate Frequency Ranges See Frequency Ranges and Bandswitch Points for complete description Band 4 20 to 26 5 GHz Harmonics up to maximum output frequency 35 Subbarmonics and multiples thereof up to maximum output frequency 20 Non harmonically relat...

Page 42: ...O frequency that could fall within the 22 GHz to 26 5 GHz range are determined The LO is set to a CW frequency 50 MHz below each harmonic The specification is in dB below the carrier To establish the carrier level at the IF the DUT is temporarily set to the frequency of the harmonic and a reference level is established on the Spectrum Analyzer The DUT is returned to the original CW frequency The a...

Page 43: ...that could fall within the 22 to 26 5 GHz range Press SHIFT M2 to display from left to right the band number in POWER dBm display and the YO frequency Determine all possible YO harmonic frequencies that could fall within the 22 to 26 5 GHz range 4 Press the LO CW key and enter a frequency 50 MHz below the harmonic frequency to be tested Press the POWERLEVEL key and using the rotary knob increase t...

Page 44: ...requency from the HP 8340B 41B under test DUT to a 1 MHz IF The IF signal is amplified and for 30 Hz 100 Hz and 1 kHz offsets sent directly to a low frequency spectrum analyzer HP 3585A For 10 kHz and 100 kHz offsets a 1 MHz notch filter is inserted between the amplifier and the HP 3585Ato attenuate IF signal and obtain increased dynamic range on the HP 3585A Phase noise is measured using the OFFS...

Page 45: ...libra tion data and a 3 dB correction factor to obtain the actual phase noise The formula that is used is Actual Phase Noise MNL t IFCD CD 3 dB IFCD is the response of the 1 MHz notch filter at 1 MHz Since the filter is not installed during the 10 Hz 100 Hz and 1 kHz measurements IFCD 0 During the 10 kHz and 100kHz offset measurements the notch filter attenuates the IF causing the power difference...

Page 46: ...tant that the mixer be connected directly to the LO s RF Output connector Procedure 1 Connect equipment as shown in Figure 4 9 with the amplifier connected directly to the HP 3585A 50 Ohm input NOTE The foam pads shown in Figure 4 9 are required to isolate the DUT and LO from mechanical vibrations which could induce phase noise NOTE In this procedure the LO is programmed for 10 dBm At some points ...

Page 47: ...equency by 30 Hz IF 1 00003 MHz 0 9Hz 13 Allow one sweep of the HP 3585A to occur Adjust the HP 3585A marker to the peak of the IF Record the marker power level Cal Data into Table 4 19 Table 4 19 Phase Noise Calibration Data Step Offset Hz Cal Data dB 13 30 CD 14 100 CD 16 1K CD 19 10K CD 21 lOOK CD 22 0 IFDC 100 Hz Offset Calibration 14 Reduce the LO frequency by 70 Hz IF 1 0001 MHz 0 9 Hz Repea...

Page 48: ...just turns on and then increment it one step Allow one sweep to occur 30 Hz Offset not applicable to units equipped with Option 007 Relaxed Phase Noise Specifications 26 On the HP 3585A press MANUAL CLEAR A MKR CF COUNTER 27 On the HP 3585A press OFFSET ENTER OFFSET CF STEP SIZE 30 Hz MANUAL STEP UP key NOISE LVL The noise level measurement takes approximately 30 seconds For an accu rate reading a...

Page 49: ...he HP 3585A press FREQUENCY SPAN 2S kHz RES 8W 100 Hz Decrement the RANGE until the overload light just turns on and then increment it one step 34 Repeat steps 26 through 28 with a CF STEP SIZE of 10 kHz substituted in step 27 100 kHz Offset 35 On the HP 3585A press FREQUENCY SPAN 2S0 kHz RES BW 1 kHz 36 Repeat steps 26 through 28 with a CF STEP SIZE of 100 kHz substituted in step 27 37 Repeat ste...

Page 50: ...ing data was obtained for the 10 kHz offset at 2 202 GHz CD 25 6 dB obtained in step 19 IFCD 44 2 dB obtained in step 22 MNL 66 0 dB obtained in step 34 Therefore Actual Phase Noise MNL IFCD CD 3 DB 66 0 44 2 25 6 3 87 6 The value 87 6 would be entered into Table 4 22 Table 4 22 Phase Noise Test Results Actual 1 Single Sideband Phase Noise dBcIl Hz Offset Hz 2 202 GHz 6 902 0Hz 13 402 GHz 19 502 0...

Page 51: ...igure 2 in the HP 8340B 41B specification table Accuracy Starting Power Level Same as Output Power Accuracy Power Sweep Width and Linearity See Figure 2 in the HP 8340B 41B specification table In normal operation a the ALC does not operate below 9 9S dBm see Figure 3 in the HP 8340B 41B specification table and so the maximum power sweep range is the difference of 9 95 dBm and the maximum leveled p...

Page 52: ... 2 0 dBm ALC Power level to set the start of the power sweep at 20 dBm Press PWRSWP and enter 2 1 dBm to set the power sweep range to 20 dB The maximum power sweep range is from 20 dBm to maximum power 5 Press the MANUAL key Turn the rotary knob counterclockwise to find the beginning of the power sweep i e the power meter indication is at maximum and no longer changing Record the power meter indic...

Page 53: ...uency at 0 dBm The RF output level is viewed on a spectrum analyzer A reference level is set on the spectrum analyzer display the PULSE key is pressed ON NOTE The 50 ohm termination on the DUT s PULSE input simulates the RF OFF state when PULSE is selected ON The difference between the two spectrum analyzer displayed levels is the pulse ON OFF ratio HP 8340B 418 UNDER TEST SPECTRUM ANALYZER 50 fl ...

Page 54: ... hour warm up time 2 On the DUT press INSTRPRESET then CW 1 GHz The RF power level should be 0 dBm 3 Set the spectrum analyzer CENTER FREQUENCY to equal the DUT s CW frequency FRE QUENCY SPAN 200 Hz RES BW 30 Hz PEAK SEARCH MKR CF MKR REF LVL MKRA 4 Press the DUT s PULSE key ON The spectrum analyzer marker delta amplitude level should be greater than 80 dB S Repeat steps 2 through 4 at CW frequenc...

Page 55: ...to 50 MHz using a mixer and a local oscillator The 50 MHz IF signal is amplified and applied to an oscilloscope The DUT is pulsed using a pulse generator The pulse generator output is also applied to the oscilloscope The oscilloscope is used to measure the pulse envelope rise and fall times Refer to Figure 4 12 Pulse Definitions Tv TRF RF Pulse Length TV Input Pulse Length T 0 Delay Time Vp RF Pul...

Page 56: ... N 1250 1 744 1 required if DUT is HP 8341 B Type N in to APC 3 5 in HP P N 12S0 1743 1 required if LO is HP 8341A B SMA in to BNC f HP P N 1250 1 200 BNC Tee in f f HP P N 12S0 0781 Cable Semi Rigid SMA male to SMA male HP P N 08340 20124 10 dB Attenuator HP 8493C Opt 010 Mixer HP P N 0955 0307 Low Pass Filter LPF HP P N 913S 0260 NOTE It is important that the mixer be connected directly to the L...

Page 57: ...directlyto the localoscillator RF output to obtain maximum LO drive to the mixer Connect the BNC tee directly to the HP 8340B 41B PULSE IN connector Allow a one hour warm up time LOCAL OSCILLATOR HP 8340B1418 SYNTHESIZED SWEEPER XER Figure 4 13 Pulse Modulation Rise and Fall Time Test Setup HP 8340B 41B Performance Tests 4 59 ...

Page 58: ...scilloscope to trigger on this pulse trigger on channel B 4 Press INSTRPRESET on both the DUT and the LO On the DUT press CW 1 GHz and the PULSE modulation key On the LO press CW 9 5 GHz The IF frequency is then 50 MHz Set the LO for 10 dBin or maximum leveled output The DUT s RF power should be 0 dBm NOTE For best accuracy in this test the Local Oscillator drive to the mixer should be 4 dBm 5 Set...

Page 59: ...aveform so that the modulation envelope crosses the 90 graticule at a vertical graticule line similar to Figure 4 15 8 The 10 point should be 2S nanoseconds S divisions from the 90 point 9 Repeat steps 5 through 8 at CW frequencies of 3 9 15 and if the DUT is an HP 8340B 22 GHz Set the LO CW frequency to be 50 MHz below the DUT s frequency Figure 4 14 Pulse Modulation Rise Time Waveform Figure 4 1...

Page 60: ...tion Pulse Width Band 0 0 4 to 2 3 Bands I 4 2 3 to 26 5 100 to 200 ns 200 to 500 ns 500 ns 3 0 3 dB2 1 5 0 3 dB2 0 3dB 1 5 0 3 dB2 0 3 dB 0 3 dB 1 Band 41 20 0 to 26 5 GHz only applies to the HP 8340B 2 i 15 to 55 C Duty Cycle must be 0 010 0 Description The DUT s RF outputfrequency is down converted to 50 MHz using a mixer and a local oscillator The 50 MHz IF signal is amplified and applied to a...

Page 61: ...onnect equipment as shown in Figure 4 16 Connect the mixer directly to the LOs RF output connector to obtain the maximum mixer LO inputlevel Connect the BNC tee directly to the DUT s PULSE IN connector Allow a one hour warm up 2 Set up the 8012B Pulse Generator as follows PULSE PERIOD slide switch lj t TRANSITION TIME slide switch minimum Sn AMPLITUDE slide switch top position 5 0 PULSE DOUBLE NOR...

Page 62: ...output 5 Set the oscilloscope horizontal for 50 nanoseconds division and select channel A input only Adjust the channel A IF carrier input signal vertical sensitivity to view the entire RF envelope HP 8340B 410 UNDER TEST LOCAL OSCI LLATOR NOTE It may be necessary to reduce the vertical sensitivity and or adjust the DUT s RF output level at some frequencies Figure 4 16 Pulse Modulation Accuracy Te...

Page 63: ...ld be less than the specifica tion for this pulse width and RF frequency 9 Repeat steps S through 8 for pulse widths of 200 SOO and 1000 nanoseconds 10 To testthe Pulse Repetition Frequency range 100 Hz to 5 MHz set the pulse generator period to 10 milliseconds 100 Hz and pulse width to 1 microsecond duty cycle of 0 01 Repeat steps S through 8 Set the pulse generator period to 200 nanoseconds 5 MH...

Page 64: ...nvelope The video feedthrough is measured using an oscilloscope The measured voltage is related to the RF power by P 10 log V2 R 1 mW Where P DUT RF output level minus 10 dB and R SO Ohms Equipment Pulse Generator HP 8012B Oscilloscope HP 1741A Adapters APC 3 5 f to APC 3 5 f HP PN 5061 5311 1 required if DUT is HP 8340B Type N in to APC 3 S f HP P N 1250 1 744 1 required if DUT is HP 8341 B SMA i...

Page 65: ...ITION TIME slide switch minimum Sn AMPLITUDE slide switch top position S 0 PULSE DOUBLE NORMAL NORMAL PULSE DELAY slide switch minimum Pulse Delay VERNIER fully CCW LEADING EDGE control fully CCW PULSE WIDTH slide switch iOn TRAILING EDGE control fully CCW OFFSET OFF POLARITY OUTPUT NORMAL INT LOAD IN Figure 4 17 Pulse Modulation Video Feedthrough Test Setup 4 68 Performance Tests HP 8340B 41B ...

Page 66: ...only 4 On the DUT press INSTRPRESET followed by CW 4 GHz Press the PULSE key pulse ON 5 Press the POWER LEVEL key and enter the first power level 8 dBm 6 Adjust the oscilloscope channel A vertical sensitivity and vertical position to view the video feedthrough signal similar to Figure 4 18 7 The test limits for the three power levels are shown in Table 4 28 Note that the test limit is 5 of Vpk Tab...

Page 67: ...0 and 10 dBin 9 Repeat steps S through 8 at CW frequencies of 1 1 5 and 2 GHz NOTE For DUT frequencies above 2 3 GHz the videofeedthrough is typically so small that it is difficult to measure The following steps provide a means to verify that the video feedthrough is negligible 10 Remove the 10dB pad between the DUT and the low pass filter Press the CW key and enter any frequency from 2 3 GHz to t...

Page 68: ...n analyzer The modulating frequency is then set to the bandwidth specification 100 kHz and the modulation analyzer should indicate 3 dB this shows that the actual 3 dB point will occur at a frequency 100 kHz Finally the function generator output level is increased to obtain 90 modulation depth Equipment Local Oscillator HP 8340A Opt 001 or any HP 8341A B1 Modulation Analyzer HP 8901A Function Gene...

Page 69: ...o APC 3 S in HP P N 1250 1 743 1 required if LO is HP 8341A B Type N in to BNC f HP P N 1250 1 476 SMA in to BNC f HP P N 1250 1 200 BNC Tee in f f HP P N 1250 0781 Cable Semi Rigid SMA male to SMA male HP P N 08340 20124 20 dB Attenuator HP 8493C Opt 020 Mixer HP P N 095S 0307 RF OUTPUT HP 834081415 POWER METER LOCAL UNDER TEST OSCI LLATOR Figure 4 19 Amplitude Modulation Test Setup 4 72 Performa...

Page 70: ...plied to the sensor press the power meter RANGE HOLD Press the DUT s RF key to turn the RF OFF Zero the power meter Press the RF key to turn the RF ON 4 Using the DVM as an indicator set the function generator to output 0 Vdc If the function gener ator being used does not have this feature use a dc power supply Press the DUT s AM key AM ON Note the power meter indication S Simulate t30O omodulatio...

Page 71: ...o 50 MHz by pressing FREQ 50 MHz then press AM and AVE The modulation analyzer should indicate about 21 Note the DVM indication 12 Press the dB key As the modulating frequency is changed the modulation analyzer will indicate the flatness in dB relative to the 1 kHz reference 13 Set the function generator to 100 200 SOO Hz then 1 2 5 and 10 kHz Check the DVM indication and adjust the level of the m...

Page 72: ... the FM accuracy This is measured at a 100 kHz rate Equipment Spectrum Analyzer HP 8566B Digital Voltmeter HP 3456A Function Generator HP 3325A Adapters APC 3 5 f to TYPE N in HP P N 12S0 1744 1 required if DUT is HP 8340B 2 required if DUT is HP 8341 B APC 3 S f to APC 3 S f HP P N S061 S311 1 required if DUT is HP 834GB BNC f to dual banana HP P N 1251 2277 BNC Tee in f f HP P N 12S0 0781 Cables...

Page 73: ...nected directly to the DUT s FM input BNC 2 Set the function generator to a 100 kHz sine wave Set the DVM to ac volts 3 Press INSTRPRESET on the DUT and set up the following conditions Sweep Mode CW Frequency out 2 2 GHz Leveling NT RF Output 0 dBin RF Peaking PEAK ON FM ON FM Sensitivity 1 MHz V default condition Figure 4 20 FM Accuracy Setup 4 76 Performance Tests HP 8340B 41B ...

Page 74: ...input with the DVM Note this value on the test record card as Vin Calculate the actual FM sensitivity and then the percent error Actual deviation is equal to 2 404 times 100 kHz since the modulation index is at the first Bessel Null The actual FM sensitivity is then Actual FM Sensitivity 2404 Vin x 1 414 Error 100 x Actual FM Sensitivity Range Range Where Range 1 for 1 MHz V or 10 for 10 MHz V 8 S...

Page 75: ...that the cable delay causes a phase shift of 900 this will be explained in the procedure The outputof the discriminator is fed to the SO Ohm input of an HP 3585A spectrum analyzer Byusing the tracking generator output to drive the FM input of the DUT a swept response of FM Flatness will be seen on the spectrum analyzer CRT The response relative to 100 kHz is verified against the specification This...

Page 76: ...input of the HP 3585A The HP 3585A should not be connected to the mixer at this time 2 Press INSTRPRESET on the DUT and set up as follows Sweep Mode Frequency PEAK Leveling Power Out CW 2 2 GHz ON INT 6 dBm Set the HP 355D step attenuator to 30 dB SPECTRUM ANALYZER 0000 aaaaa O u 0000 a 0000 a aaa Co u 0000 O 0 0 ooa 00000 FM AMS CONNECTEO ONLY IN STEPS to THROUGH t3 CONNECTED ONLY IN STEPS B THRO...

Page 77: ...tom horizontal graticule Make sure the OVER RANGE message does not come on Turn off the Autorange function Adjust the RANGE if the OVER RANGE message comes on S Press CONT sweep to take a swept response of the signal path When a full sweep is com pleted press STOREA o B and A B Turn VIEW B OFF A strait line should be displayed across the center of the HP 3585A CRT Press SAVE 1 on the HP 3585A NOTE...

Page 78: ...l the marker is on the center horizon tal graticule If the OVER RANGE beep and message occur turn the rotary knob in the opposite direction Don t be concerned if the marker does not move at first it may take several complete turns of the rotary knob before any change is noticed on the CRT 12 Press CONT sweep on the HP 3585A The spectrum analyzer will now display the FM flatness from 50 kHz to 10 M...

Page 79: ...should be in LOCAL mode The procedure instructs the operatorto press specific HP 8340B 41 B front panel keys and perform certain functions which should set specific bits of the status bytes This procedure will test most of the bits in the two status bytes However if the instrument is working properly the status bitfor the Fault Indicator On the Oven Cold and the Self Test Failed will not be tested...

Page 80: ...tus bits that are set and press CONT 3 Press the DUT s CW key After the program goes through the output loop about three times all status bits should be 0 however status byte 1 bit 1 should have been set during one of the output loop passes Enter 1 5 GHz and the byte 1 status bits will change but after about 2 passes all status bits should be 0 5 Switch the DUT s rear panel FREQUENCY REFERENCE swi...

Page 81: ...HP lB Syntax Error SRQ on End of Sweep SRO on RE Settled SRO on Changed in Extended Status Byte SRO on Numeric Entry Completed HP lB or Front Panel SRO on Any Front Panel Key Pressed EXTENDED STATUS BYTE 2 BIT 7 6 5 4 3 2 1 0 DECIMAL VALUE 128 64 L 32 L 16 L 8 4 2 1 L FUNCTION Fault Indicator On RF unleveled Power Failure RF unlocked External Freq Ref Selected Oven Cold Over Mod ulation Self Test ...

Page 82: ...P 180 DISP 190 ENTER Ii USING B E7F 200 FORI 1T02 210 DISP I 220 IF 1 1 THEN N E 230 IF 1 2 THEN N F 240 FORJ 7TOOSTEP 1 250 A BIT N J 260 DISPA 270 NEXT J 280 DISPN 290 DISP 300 NEXT I 310 DISPUSING 4 A 320 KEY LABEL 330 GOTO 120 340 350 I Syntax Te5t 360 370 OUTPUT Ii XYZ 380 RETURN 390 400 Te tDataBit5 410 420 CLEAR 430 DSP USNG K TESTDATA BITS 440 FORC 0T07 4S0 B 2AC 460 OUTPUT Ii USING K B TI...

Page 83: ...T A NEXT J PRINT USING X SD N PR I NT NEXT I BEEP 200 01 GOTO Read status 10 20 30 40 50 60 70 80 90 100 110 120 130 140 160 Read status 160 OUTPUT I1 OS 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 Syntax 400 410 420 430 440 Data bit 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610 620 OUTPUT Ii XYZ GOTO Read etatus Clear screen TE...

Page 84: ...er Tested By SPECIFICATIONS TESTED Limits Step TEST Conditions Lower Limit Measured Value Upper Limit 4 1 Internal Time Base Aging Rate Time for 360 degree phase change T 2 Time between T1 and T3 T3 Time for 360 degree phase change Calculated Aging Rate 5 seconds hours seconds per day HP 8340B 41B Performance Tests 4 89 ...

Page 85: ...ounter Resolution Freq 4 Hz Counter Resolution MHz GHz GHz M N Divider Check M Divider M 8 N 13 9 4b Freq 1 Hz Counter Resolution 2490MHz 2480 MHz MHz MHz 10 11 2470 MHz 2460 MHz MHz MHz 12 2450 MHz MHz 13 2440 MHz MHz 14 2430 MHz MHz 15 2420 MHz MHz 16 2410 MHz MHz 17 2400 MHz MHz 18 2390 MHz MHz 19 2380 MHz MHz 20 2370 MHz MHz 21 2360 MHz MHz 22 2350 MHz MHz 23 2340 MHz MHz 24 2330 MHz MHz 25 26...

Page 86: ...esolution M 27 N 13 2300MHz MHz 14 2S00 MHz MHz 15 16 2700MHz 2900 MHz MHz MHz 17 3100MHz MHz 18 3300MHz MHz 19 3500MHz MHz 20 3700 MHz MHz 21 22 23 24 3900 MHz 4100MHz 4300 MHz 4500 MHz MHz MHz MHz MHz 25 4700 MHz MHz 26 4900 MHz MHz 27 5100MHz MHz 28 5300 MHz MHz 29 5500 MHz MHz 30 5700 MHz MHz 31 5900 MHz MHz 32 33 34 6100MHz 6300MHz 6S00 MHz MHz MHz MHz 35 36 6700 MHz 6900 MHz MHz MHz HP 8340B...

Page 87: ...2 31 6000 2 31 7000 2 318000 2 319000 2 32000 4 2 Frequency Range and cw Mode Accuracy Cont d 20 30 Loop Check N2 Divider DUT ENTRY DISPLAY CF Frequency 2 31 0500 GHz 2 31 0501 2 31 0502 2 310503 2 31 0504 2 310505 2 31 0506 2 31 0507 2 31 0508 2 31 0509 2 31 0510 2 31 0510 2 31 0520 2 31 0530 2 31 0540 2 310550 2 310560 2 310570 2 310580 2 310590 2 310600 2 310600 2 310700 2 310800 2 31 0900 2 31...

Page 88: ...der DUT ENTRY DISPLAY CW Frequency 2319 97 MHz 2319 96 2319 95 2319 94 2319 93 2319 92 2319 91 2319 90 2319 89 2319 88 2319 87 2319 87 2319 77 2319 67 2319 57 2319 47 2319 37 2319 27 2319 17 2319 07 2318 97 2318 97 2317 97 2316 97 2315 97 2314 97 2313 97 2312 97 2311 97 2310 97 7a 7c 7d 7e 7f 7g MHz MHz MHz MHz MHz MHz MHz ____ GHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MH...

Page 89: ...s Step TEST Conditions Lower Limit Measured Value Upper Limit 4 3 Sweep Time Accuracy 10 milliseconds 100 milliseconds 1 second 10 seconds 50 seconds 4 9 5 ms 95 ms 0 95s 9 S s 47 S s ms ms s s s 10 5 ms 105 ms 1 OSs 10 S s S2 S s 4 94 Performance Tests HP 8340B 41B ...

Page 90: ... this step only when testing an HP 8340B 8 2 3000198 2 3000202 2 3000998 2 3001002 2 300998 2 301 002 2 302 2 304 2 306 2 308 2 3098 2 31002 2 312 2 314 2 316 2 318 2 31998 2 32002 2 3998 2 4002 3 298 3 302 3 500 5 1304 5 84 6 75 7 14 0 99 1 01 4 99 5 01 49 9 100 02 200 400 600 800 998 1020 1200 1400 1600 1800 1980 2002 4990 5010 49900 50000 50000 50000 50000 50000 50000 2 30001881 2 30001919 2 30...

Page 91: ...his step only when testing an HP 8340B 8 2 3000495 2 3000505 2 3002495 2 3002505 2 302495 2 302505 2 305 2 310 2 315 2 320 2 3245 2 32505 2 33 2 335 2 34 2 345 2 34995 2 35005 2 5495 2 5505 4 795 4 805 5 300 9 376 11 15 13 425 14 4 0 99 1 01 4 99 5 01 49 9 100 02 200 400 600 800 998 1020 1200 1400 1600 1800 19 4J 2002 4990 5010 49900 50000 50000 1 50000 50000 50000 50000 2 30004851 2 30004949 2 30...

Page 92: ...his step only when testing an HP 83408 8 2 3000792 2 300808 2 3003992 2 3004008 2 303992 2 304008 2 308 2 316 2 324 2 332 2 3392 2 34008 2 348 2 356 2 364 2 372 2 37992 2 38008 2 6992 2 7008 6 292 6 308 7 1 13 6216 14 16 20 1 21 66 iO 99 1 01 4 99 5 01 49 9 100 02 200 400 600 800 998 1020 1200 p1400 1600 1800 1980 2002 4990 5010 i49900 50000 50000 iSOOOO 50000 50000 50000 2 30007821 2 30007979 2 3...

Page 93: ...Sweep Auto Sweep Time Single Sweep Auto Sweep Time Single Sweep 2 Second Sweep Time M2 Frequency Standard Instrument F P Out with Atten Option 001 F P Out No Atten Option 004 R P Out with Atten Option 005 R P Out No Atten Continuous Sweep Auto Sweep Time Single Sweep Auto Sweep Time Single Sweep 2 Second Sweep Time M2 Frequency Standard Instrument F P Out with Atten Option 001 F P Out No Atten Opt...

Page 94: ...e Upper Limit Continuous Sweep Auto Sweep Time Single Sweep Auto Sweep Time Single Sweep 2 Second Sweep Time M2 Frequency Standard Instrument F P Out with Atten Option 001 F P Out No Atten Option 004 R P Out with Atten Option 005 R P Out No Atten Continuous Sweep Auto Sweep time Single Sweep Auto Sweep Time Single Sweep 2 Second Sweep Time M2 Frequency Standard Instrument F P Out with Atten Option...

Page 95: ... Continuous Sweep Auto Sweep Time Single Sweep Auto Sweep Time Single Sweep 2 Second Sweep Time M2 Frequency Standard Instrument F P out with Atten Option 001 F P Out No Atten Option 004 R P Out with Atten Option OOS R P Out No Atten Continuous Sweep Auto Sweep Time Single Sweep Auto Sweep Time Single Sweep 2 Second Sweep Time M2 Frequency Standard Instrument F P Out with Atten Option 001 F P Out ...

Page 96: ...Frequency M2 Power Level Ml Frequency Ml Power Level dBm GHz dBm GHz dBm GHz dBm Minimum Power Frequency 13 M2 Frequency GHz Minimum Power Level Maximum Power Frequency Maximum Power Level 14 iS M2 Power Level Ml Frequency Ml Power Level dBm GHz dBm Band 3 Measurement Minimum Power Frequency Minimum Power Level Maximum Power Frequency Maximum Power Level Band 4 Measurement 1 13 14 15 M2 Frequency ...

Page 97: ...and 3 Calculation Band 4 Calculation1 18 1 2 dB Standard 1 4 dB Option 004 1 2dB Option 001 1 4 dB Option 005 2 2 dB Standard 2 6 dB Option 004 1 8 dB Option 001 2 2 dB Option 005 2 2 B Standard 2 6 dB Option 004 1 8 dB Option 001 2 2 dB Option 005 2 2 dB Standard 2 6 dB Option 004 1 8 dB Option 001 2 2 dB Option 005 3 2 dB Standard 3 6 dB Option 004 2 6 dB Option 001 3 0 dB Option 005 dB dB dB dB...

Page 98: ...er Limit 4 6 External Leveling Using Negative Crystal Detector Leveling Voltage dBv 6 3 1 883V V 2 114V 0 0 944V V 1 059V 10 0 2983 V V 0 3352 V 20 0 0942 V V 0 1061 V 30 29 65 mV mV 33 70 mV 40 9 24mV my 10 79mV 50 2 785 mV mV 3 550 mV 60 0 744 mV mV 1 259 mV 66 0 273 my mV 0 731 mV HP 8340B 41B Performance Tests 4 103 ...

Page 99: ...pper Limit 4 7 Spurious signals 10 MHz to 22 GHz HP 534GB 10 MHz to 20 GHz HP 83415 Frequency of Interest Selected 6 6 Refer to Table 4 16 for Specifications 4 8 Spurious Signals 22 to 26 5 GHz HP 83405 only Frequency of Interest Selected 6 6 Refer to Table 4 17 for Specifications 4 104 Performance Tests HP 8340B 41B ...

Page 100: ... 100 kHz 30Hz 100 Hz 1 kHz 10kHz 100 kHz 30Hz 100 Hz 1 kHz 10kHz 100 kHz 30Hz 100 Hz 1 kHz 10kHz 100 kHz 1 Pertorm this step only when testing an HP 8340B 38 ______ dBc ______ dBc d Bc d Bc d Bc ______ dBc ______ d Bc ______ dBc ______ dBc dBc ______ dBc ______ dBc dBc dBc ______ dBc dBc dBc ______ dBc ______ dBc ______ dBc ______ dBc dBc ______ dBc ______ dBc ______ dBc 64dBc 70 dBc 78 dBc 86 dBc...

Page 101: ...EST Conditions Lower Limit Measured Value Upper Limit 100 Hz 1 kHz 10kHz 100 kHz 100 Hz 1 kHz 10kHz 100 kHz 100 Hz 1 kHz 10kHz 100 kHz 100 Hz 1 kHz 10kHz 100 kHz 1 Perform this step only when testing an HP 8340B 38 dBc d Bc dBc dBc ______ d Bc ______ d Bc d Bc d Bc dBc d Bc dBc ______ dBc dBc dBc ______ dBc ______ d Bc d Bc d Bc ______ d Bc ______ dBc 67 dBc 75 dBc 83 dBc 107 dBc 67 dBc 75 dBc 83 ...

Page 102: ...evel 5 dBm End Level 6 dBm Power Sweep Range 7 Must be 20 dB difference 20 dB dB 10 GHz Start Level 5 dBm End Level 6 dBm Power Sweep Range 7 Must be 20 dB difference 20 dB dB 15 GHz Start Level End Level Power Sweep Range 7 7 Must be 20 dB difference 20 dB dBm dBm dB 26 GHz 1 Start Level 5 dBm End Level 6 dBm Power Sweep Range 7 Must be 20 dB difference 20 dB dB t Perform thia step only when test...

Page 103: ...should be 25 nanoseconds from 1 0O o point nsec nsec 25 nsec 25 nsec 3GHz Rise Time Fall Time 8 8 Fall Times 100 0 point should be 25 nanoseconds from 900 o point nsec nsec 25 nsec 25 nsec 9GHz Rise Time Fall Time 15GHz 8 8 nsec nsec 25 nsec 2snsec Rise Time 6 nsec 25 nsec Fall Time 8 nsec 25 nsec 22 GHz 1 Rise Time Fall Time 8 8 nsec nsec 25 nsec 25 nsec 1 Pertorm this step only when testing an H...

Page 104: ...er Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 ENTRY DISPLAY Power Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 ENTRY DISPLAY Power Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 4 13 Pulse Modulation Accuracy DUT CW Freq 1 GHz PRF 100 kHz Pulse Width 100 ns Pulse Width 200 ns Pulse Width 500 ns Pulse Width 1000 ns Pulse Repetition Freq Range DUT C...

Page 105: ... between steps 6 and 7 ENTRY DISPLAY Power Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 ENTRY DISPLAY Power Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 4 13 Pulse Modulation Accuracy Cont d Pulse Repetition Freq Range DUT CW Freq 3 GHz Minimum PRF PRF 100 Hz PW 1 microsecond Maximum PRF PRF 5 MHz PW 100 nanoseconds DUT CW Freq 9 GHz PRF 100 kHz Pulse Width 100 ns...

Page 106: ...ISPLAY Power Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 ENTRY DISPLAY Power Level ENTRY DISPLAY Power Level A Power between steps 6 and 7 0 3 dB O 3 dB 0 3 dB 0 3 dB 0 3 dB 0 3 dB dBm dBm dB dBm dBm dB dBm dBm dB dBm dBm dB dBm dBm dB dBm dBm dB i 1 5 dB 0 3dB 0 3dB rO 3 dB 0 3dB rl 5 dB HP 8340B CW Freq 22 GHz PRF 100 kHz Pulse Width 100 ns Pulse Width 200 ns Pulse Width 500 ns...

Page 107: ...q 22 GHz 10 Perform the following steps only when testing an HP 8340B Minimum PRF PRF 100 Hz PW 1 microsecond 6 ENTRY DISPLAY Power Level dBm 7 ENTRY DISPLAY Power Level dBm 8 A Power between steps 6 and 7 0 3 dB dB 0 3dB Maximum PRF PRF 5 MHz PW 100 nanoseconds 6 ENTRY DISPLAY Power Level dBm 7 ENTRY DISPLAY Power Level dBm 8 A Power between steps 6 and 7 0 3 dB dB 1 5 dB 4 112 Performance Tests ...

Page 108: ... dBm 0 dBm 10 dBm 7 Oscilloscope peak voltage mV mV mV 12 mV 5mV 1 6mV DUTCWFreq 1 GHz Power Level i 8 dBm 0 dBm 10 dBm DUTCWFreq 1 5GHz Power Level 8 dBm 0 dBm 10 dBm DUTCWFreq 2GHz Power Level 8 dBm O dBm 10 dBm 7 7 7 mV mV mV mV mV mV mV mV mV 12 mV 5mV 1 6mV 12 mV 5mV 1 6mV 12 mV SmV 1 6mV DUTCWFreq 2 3GHz Power Level 10 dBm Any Frequency Selected 10 mV O 2mV HP 8340B 41B Performance Tests 4 1...

Page 109: ...2 18 dB 2 91 dB 3dB 9o0 4 15 Amplitude Modulation AM Sensitivity DUTFreq 1 5GHz Power 5 dBm j 30 Modulation 30 Modulation DUT Freq 1 5 GHz Power 5 dBm 300 o Modulation 300 o Modulation DUT Freq 4 5 GHz Power 5 dBm 300 o Modulation 30 Modulation DUT Freq 4 S GHz Power 5 dBm 30 Modulation 30 Modulation DUT Freq 1 5 GHz AM Frequency Response Funct Gen 1 kHz 100 Hz 200 Hz 500 Hz 1 kHz 2 kHz 5 kHz 10 k...

Page 110: ...ct Gen 100 kHz Adjust output level to that noted in Step 11 AM Depth Funct Gen 1 kHz DUT Freq 9 GHz AM Frequency Response Funct Gen 1 kHz 100 Hz 200 Hz 500 Hz 1 kHz 2 kHz 5 kHz 10kHz AM Bandwidth Funct Gen 100 kHz Adjust output level to that noted in Step 11 AM Depth Funct Gen 1 kHz DUT Freq 15GHz AM Frequency Response Funct Gen 1 kHz 100 Hz 200 Hz 500 Hz 1 kHz 2 kHz 5 kHz 10kHz AM Bandwidth Funct...

Page 111: ...GHz AM Frequency Response Funct Gen 1 kHz 100 Hz 200 Hz 500 Hz 2 kHz 11 12 13 Note DVM Indication Flatness read on Modulation Analyzer Vrms dB dB dB dB dB i 0 2 dB i 0 2dB ziO 2dB i 0 2dB 0 2dB S kHz 10 kHz dB dB 0 2dB 0 2dB AM Bandwidth Funct Gen 100 kHz Adjust output level to that noted in Step 11 14 Modulation Analyzer Indication 3 dB dB AM Depth Funct Gen 1 kHz 15 Maximum Modulation Depth 90 O...

Page 112: ...tion ACCU RACY CW Freq 2 2 GHz FM Sensitivity 1 MHz V FM Sensitivity 10 MHz V CW Freq 2 5 GHz FM Sensitivity 1 MHz V FM Sensitivity 10 MHz V CW Freq 6 9 GHz FM Sensitivity 1 MHz V FM Sensitivity 10 MHz V CW Freq 13 4 GHz FM Sensitivity 1 MHz V FM Sensitivity 10 MHz V CWFreq 18GHz FM Sensitivity 1 MHz V FM Sensitivity 10 MHz V FLATNESS FM Sensitivity 1 MHz V CW Freq 2 2 GHz CW Freq 2 5 GHz CW Freq ...

Page 113: ...CW Freq 2 2 GHz 13 Worst Case Power Level dB 3 dB CW Freq 2 5 GHz 13 Worst Case Power Level dB 3 dB CW Freq 6 9 GHz 13 Worst Case Power Level dB 3 dB CW Freq 13 4 GHz 13 Worst Case Power Level dB 3 dB CW Freq 18 GHz 13 Worst Case Power Level dB 3 dB CW Freq 20 GHz 1 13 Worst Case Power Level dB 3 dB 1 Perform this step only when testing an HP 834GB 4 118 Performance Tests HP 8340B 41B ...

Page 114: ... instrument in safe condition Service and adjustments should be performed only by qualified service personnel NG Adjustments in this section are performed with power supplied to the instrument while protective covers are removed There are voltages at many points in the instrument which can if contacted cause personal injury or death Be extremely careful Adust ments should be performed only by trai...

Page 115: ... locations of assemblies containing adjustments and locations of those adjustments within the assemblies are contained within the adjustment procedures where they apply Also major assembly and component location illustrations are located in volume 3 ACCESSING AND STORING CALIBRATION CONSTANTS Introduction The HP 8340B 41 B contains three memory areas reserved for calibration constants These areas ...

Page 116: ...o select a different calibration constant number The ENTRY keyboard or the front panel rotary knob can be used to change the value After the new value has been entered press the Hz key to retain the new values in working memory area Procedure to Store the Calibration Constants After adjustments of the calibration constants are completed the data thus stored in the working memory area should be cop...

Page 117: ...acy and FM Overmod Adjustment YO Delay Compensation A54 3 7 GHz Oscillator A8 Marker Bandcross A57 Sweep Generator A58 Unleveled RE Output Adjustments ALC Adjustments Leveled RE Output Adjustments RE Output Power Flatness and Adjustment Pulse Adjustments External Module Leveling Adjustment 5 1 5 2 5 3 5 4 5 5 5 6 5 7 5 8 5 9 5 10 5 11 5 12 5 13 5 14 5 15 5 16 5 17 5 18 5 19 5 13 5 15 S 19 5 23 5 2...

Page 118: ...n is 100 MHz A30L4 0 22 0 68 mH 5 3 Centers Oscillator at 100 MHz A30R67 110 825 Ohms 5 3 Part of attenuator to set 400 MHz output at 10 dBm A30R68 6 8 61 9 Ohms 5 3 Part of attenuator to set 400 MHz output at 10 dBm A30R69 110 825 Ohms 5 3 Part of attenuator to set 400 MHz output at 10 dBm A39C49 8 2 16 PF 5 5 Sets range of 050 so midposition is 160 MHz A48C22 100 160 PF 5 8 Selected to tune RLC ...

Page 119: ...RD Bias and ALC Loop Gain None SRD Bias and ALC Loop Gain None None None None Pulse Adjustment 1 The highest Band available with an HP 8341B is Band 3 2 Assemblies which are not listed do not require adjustment 5 14 and 6 16 A24 and A26 adjustments only 5 14 and 5 16 A24 and A26 adjustments only 5 18 Al Alpha Display A2 Display Driver A3 Display Processor A4 Not Assigned AS Keyboard A6 Keyboard In...

Page 120: ...ustments A22 Not Assigned A23 FM Driver A24 Attenuator Driver SRD Bias A25 ALO Detector A26 Linear Modulator A27 Level Control A28 SYTM Driver A29 Reference Phase Detector A30 100 MHz VCXO A31 M N Phase Detector A32 M N VCO A33 M N Output A34 Reference M N Mother Board A35 Rectifier A36 PLL1 VCO A37 PLL1 Divider A38 PLL1 IF A39 PLL3 Upconverter A40 PLL2 VCO A41 PLL2 Phase Detector A42 PLL2 Divider...

Page 121: ...61 Not Assigned A62 Main Mother Board A63 90 dB RF Attenuator YO Adjustment Delay Adjustment and YTM Delay Flatness Adjustment None YO Adjustment and Delay and YTM Adjustment and Delay Sampler Adjustment YO Loop and FM Adjustments None 10 MHz Standard Adjustment None None YO Pretune YO Main Driver and YO Delay Compensation SYTM Delay Compensation YO Adjustment None Marker Bandcrossing Adjustment S...

Page 122: ...2252 0160 2253 0160 2254 0160 2255 0160 2256 0160 2257 0160 2258 0160 2259 0160 2260 0160 2261 0160 2262 0160 2263 0160 2264 0160 2265 0160 2266 0160 2306 0160 2199 8 9 8 4 5 6 7 8 8 0 2 3 6 7 8 9 0 2 3 4 5 8 9 0 2 3 4 8 2 33 36 39 43 47 51 56 62 68 75 82 91 100 110 120 130 150 160 180 200 220 240 270 300 330 360 390 430 470 510 560 620 680 0160 2150 0160 2308 01 40 01 90 0160 2200 0160 2307 0160 ...

Page 123: ...3 48K 3 83K 4 22K 4 64K 5 11K 5 62K 6 19K 6 81K 7 50K 8 24K 9 09K 10 0K 11 0K 12 1K 13 3K 14 7K 16 2K 17 8K 19 6K 0698 0082 0757 0416 0757 0417 0757 0418 0757 0419 0757 0420 07S7 0421 07S7 0422 07S7 0280 07S7 0424 0757 0274 0757 0317 0757 1 094 0757 0428 07S7 0278 0698 0083 0698 0084 0698 3150 0698 008S 0698 3151 0757 0279 0698 3152 0698 3153 0698 3154 0698 3155 0757 0438 0757 0200 0757 0290 0757 ...

Page 124: ...819 0757 0159 0757 0820 0757 0821 0698 3406 0757 1078 0757 0873 0698 0089 0698 3407 0698 3408 0698 3409 0698 0024 0698 3101 0698 3410 0698 3411 0698 3412 0698 3346 0 8 5 7 1 2 3 4 7 9 0 4 2 3 4 5 7 8 5 9 0 4 6 7 8 7 7 1 2 3 2 4 64K 5 11K 5 62K 6 19K 6 81K 7 50K 8 25K 9 09K 10 0K 12 1K 13 3K 14 7K 16 2K 17 8K 19 6K 21 5K 23 7K 26 1K 28 7K 31 6 K 34 8K 38 3K 42 2K 46 4K 51 1K 56 2K 61 9K 68 1K 75 0K...

Page 125: ...140 0131 5 560NH 9100 2232 7 24MH 9100 2867 4 680 NH 9140 0141 7 50 NH 9100 2891 4 820 NH 9100 2257 6 51 NH 9135 0073 3 1 2 UH 91 00 2258 7 68 NH 91 35 0081 3 1 8 UH 91 00 2260 1 100 NH 91 00 2247 4 2 2 UH 9140 0098 3 120 NH 91 00 2248 5 3 3 UH 9140 0111 1 4 7 UH 9140 0144 0 150 NH 9100 2249 6 180 NH 91 00 2250 9 5 6 UH 91 00 1 618 1 220 NH 9100 2251 0 270 NH 91 00 2252 1 330 NH 91 00 0368 6 5 12 ...

Page 126: ...3456A Procedure 1 Position OUT in the test position and connect equipment as shown in Figure 5 1 2 Set LINE switch to ON 3 The yellow 22V indicator on A35 should be lit 4 The OVM indication should be 22 000 0 010 Vdc If the indication is out of tolerance adjust A35R3 22 ADJ Figure 5 2 control for the specified voltage Figure 5 1 22 Volt Power Supply Adjustments Setup HP 8340B 41B Adjustments 5 13 ...

Page 127: ...5 1 22 VDC POWER SUPPLY A35 Cont d BOTTOM VIEW 22V ADJ A35R3 22V A35TP1 Figure 5 2 22V Power Supply Adjustment Locations 5 14 Adjustments HP 8340B 41B ...

Page 128: ...1 1 for aging rate specifi cations for the internal time base Time base specifications for the HP 8340B and HP 8341B are the same OSCILLOSCOPE FREQuENcY STANDARD Equipment Oscilloscope HP 1741A Frequency Standard any 1 2 5 or 10 MHz Frequency Standard with aging rate of lxlO 9 day or better such as HP 5061A Procedure NOTE Primary power must have been applied to the instrument for at least 30 days ...

Page 129: ...put of the oscilloscope e Set LINE switch to ON 2 Set oscilloscope controls as follows TIME DIV 0 05 jisec CHAN A VOLTS DIV 0 5 MAG x 10 pushbutton OUT DISPLAY A pushbutton IN TRIGGER COMP A B A NT EXT trigger pushbutton IN EXT Divide By 10 OUT SWEEP VERNIER control CAL TRIGGER HOLDOFF Fully Counterclockwise AC DC trigger pushbutton OUT AC POS NEG trigger pushbutton OUT POS Main TRIGGER LEVEL cont...

Page 130: ...5 2 10 MHz STANDARD ADJUSTMENT ASI Cont d BOTTOM VIEW ASi FINE A51 10 MHz STANDARD FREQUENCY STANDARD NT EXT A51 COURSE Figure 5 4 10 MHz Standard Adjustments Location HP 8340B 41B Adjustments 5 17 5 18 ...

Page 131: ... A3OWI ADAPTER EXT FRED I STANDARD REAR PANEL Figure 5 5 100 MHz VCXO Adjustment Setup Equipment Spectrum Analyzer HP 8566B Digital Voltmeter HP 3456A Low Voltage DC Power Supply HP 6294A BNC to SMB Snap On Test Cable 2 required HP P N 85680 60093 Adapter SMB Snap On Male to Male HP P N 1250 0069 Procedure 1 Position OUT intothe Test Position as shown in Figure 5 5 with the bottom cover removed On...

Page 132: ...UT set LINE switch to ON and press INSTR PRESET 4 At rear panel of the OUT disconnect the 10 MHz Frequency Standard cable at the EXT FRE QUENCY STANDARD connector 5 Adjust the DC power supply for 8 OV connect the ground lead to ground and the negative lead to A3OTP1 TUNE Connect the DVM to A3OTP1 TUNE and verify that TUNE measures 8 OV Re adjust the power supply if necessary BOTTOM VIEW A30 A53 A5...

Page 133: ...um Analyzer should be greaterthan 100 MHz If not repeat Steps 2 through 7 and verify that the oscillator s range is 100 MHz 300 Hz Disconnect power supply from A3OTP1 Reconnect 10 MHz signal cable from Spectrum Analyzer to the OUT s rear panel EXT FREQUENCY STANDARD 400 MHz OUTPUT ADJUSTMENT 15 Set Spectrum Analyzer to 500 MHz center frequency and 100 MHz frequency span per division 16 Connect Spe...

Page 134: ...t step 15 Table 5 5 Selection Chart for Attenuator Resistors Attenuation dB3 Resistors Ohms R67 R68 R69 9 9 9 9 9 9 9 9 9 9 Open 825 422 261 215 178 162 133 121 110 Short 6 8 121 17 8 23 7 31 6 38 3 46 4 51 1 61 9 Open 825 422 261 215 178 162 133 121 110 NOTE HP Part Numbers for resistors may be found in Table 5 5 20 Set the OUT s LINE switch to STANDBY Disconnect equipment from the OUT and reconn...

Page 135: ...P 6294A BNC to SMB Snap On Test Cable HP P N 85680 60093 Adapter SMB Snap On Male to Male HP P N 1250 0069 Procedure 1 Position the OUT in the test position as shown in Figure 5 7 with bottom cover removed On the OUT s rear panel disconnect the BNC cable connected between INT and EXT Frequency Stan dard connectors set INT EXT switch to EXT then connect a BNC cable from the OUT s EXT connector to S...

Page 136: ... FREQ SPAN 5 kHz SWEEP TIME 1 SEC MARKER ENTRY Press PEAK SEARCH MARKER ENTRY Press MKR CF MARKER MODE Press SIGNAL TRACK 5 The M N output frequency indicated on Spectrum Analyzer should be 197 419 MHz o1 count NOTE To display the frequencies that the processor programs press SHIFT Ml on the DUT It will display from left to right the M divide number the N divide number the M N output frequency and...

Page 137: ...e Frequency Span to 100 MHz Log Scale 5dB Division and the Reference Level to 5 dBm Do not apply a positive voltage to A32TP1 or damage may occur to the VCO tuning diodes 14 Connect the low voltage power supply to the OUT as follows Positive lead to ground do this first Negative lead to A32TP1 TUNE test point Set the output of the supply for 35 0 Vdc 0 5Vdc 15 Adjust A32A2C5 PWR for a VCO output l...

Page 138: ...e Detector mustbe disabled and a slightly different procedure used to initially set the A40 and A43 adjustments Phase Lock Loop 3 is adjusted for maximum multiplier output level at 160 MHz The VCO is adjusted by setting up proper voltage levels at A39TP3 Phase Lock Loop 1 40 kHz LPF is properly adjusted using a function generator and spectrum analyzer with an active probe The response of PLL1 is a...

Page 139: ...m cover removed and allow one half hour warm up time Set LINE switch to STANDBY Remove A41 PLL2 Phase Detector from its connector on the motherboard It is not necessary to completely remove the A41 assem bly from the instrument 2 Set the LINE switch to ON and press INSTRPRESET 3 Remove the cable from A40J3 15 6 MHz OUT FOR AF 1 MHz and connect the Frequency Counter to A40J3 using a BNC to SMB snap...

Page 140: ...l NATOR A41 PLL2 PHASE DETECTOR A40 PLL2 VCO A41 TP7 DETOUT I 1 2 aozLEZ m LJ www U QWuFIl O WUOLEIJ LHI0 WLLLLLU DiJ R2 150 MHz R4 R41 TP5 R9 2 MHz VCO TUNE 3 MHz A40 J3 15 6 MHz OUT Figure 5 10 Location of PLL2 Adjustments HP 8340B 41B Adjustments 5 29 ...

Page 141: ...ndication of 15 00 Vdc 0 05 Vdc 21 Connect the OVM to A41TP7 DET OUT located on the top cover of A41 22 Adjust A43R41 2 MHz for a DVM indication of 3 50 Vdc 0 05 Vdc 23 Repeat Steps 12 through 22 until no further adjustment is required 24 Set the Spectrum Analyzer as follows a Press INSTR PRESET b Set CENTER FREQ to 29 5 MHz c Set SPAN to 200 kHz 25 Connect jumper between A59TP4 OLl and A59TP5 5V ...

Page 142: ...MHz Iteration of L16 and L17 adjustment may be necessary Refer to Figure 5 11 for location of adjust ments If A39C50 does not have sufficient range select the value of A39C49 for proper range Refer to Table 5 2 36 At the OUT select the following a Press CF then enter 6 6 2 7 2 5 0 GHz b Press AF then enter 1 0 0 kHz c Press SINGLE Sweep 37 Tune the Spectrum Analyzer to a center frequency of 6 MHz ...

Page 143: ...alyzer controls as follows INSTR PRESET Press START FREQ 10kHz STOP FREQ 60 kHz REFERENCE LINE 0 dBm RES BW 300 Hz VIDEO BW 1 kHz SWEEP TIME i 2 SEC SCALE 10 dB DIV MARKER MODE NORMAL 47 Set the Spectrum Analyzer Marker to 20 kHz 48 Connect the active probe to the Spectrum Analyzer input and connectthe probe to the output of the 40 kHz LPF on A36 see Figure 5 13 This is the terminal on A36L7 next ...

Page 144: ...z STOP FREQ 470 MHz REFLINE lOdBm MARKER PEAK SEARCH 56 Connect an external low voltage dc power supply positive lead to A36TP3 and the negative lead to any convenient chassis ground Set the external power supply for 16 0 Vdc 0 1 Vdc 57 The Oscillator frequency should be 310 MHz 10 MHz as indicated on the Spectrum Analyzer If not remove the metal shield from A36 and increase or decrease the spacin...

Page 145: ...BOTTOM VIEW 38 A36 A38 PLL1 vco PLLi IF 36 Li3 i70 MHz NULL Li 2 170 MHz NULL Lii 165 MHz NULL Figure 5 12 Location of PLL1 Adjustments 4 L8 L7 50 KHz 50 KHz NULL NULL 5 34 Adjustments HP 8340B 41B ...

Page 146: ...MHz NULL to null the 165 MHz signal on the Spectrum Analyzer 7i Change the Signal Generator frequency to 320 3 MHz 0 2 MHz Set the Spectrum Analyzer CENTER FREQ to 160 MHz 72 Adjust A38L12 160 MHz NULL to null the 160 MHZ signal on the Spectrum Analyzer 73 Set the Spectrum Analyzer CENTER FREQ to 140 MHz Tune the Signal Generator to 300 3 MHz 0 2 MHz Note the amplitude of the 140 MHz response on t...

Page 147: ... in the test position as shown in Figure 5 13 with bottom cover removed and turn the LINE switch on Connect the test equipment as shown in Figure 5 13 and allow one half hour warm up time Be sure to connect DVM ground to A54TP7 RGNO 2 Set the OUT as follows a Press INSTR PRESET b Press CW then enter 2 3 GHz to tune the YO to 2 3 GHz minimum DAC output 3 Connect the DVM to A54TP6 VOAC and adjust A5...

Page 148: ...5 6 YO PRETUNE DAC A54 Cont d BOTTOM VIEW Figure 5 14 YO Pretune DAC Gain Adjustments Location 5 38 Adjustments HP 8340B 41B ...

Page 149: ... in the test position as shown in Figure 5 15 with top and bottom covers removed Remove W3 Figure 5 17 and connect the frequency counter to W51 as shown in Figure 5 15 Allow one half hour for warm up time 2 Remove cable W38 from A49J2 and connect a 50 Ohm load to the end of the cable 3 Set the OUT as follows a Press INSTR PRESET b Press CW then enter 2 3 GHz 4 Adjust A55R47 OFFSET Figure 5 16 for ...

Page 150: ...adjustments are necessary 8 Disconnect the Frequency Counter and reconnect W3 to W51 Figure 5 17 Remove 50 Ohm load from cable W38 and reconnect the cable to A49J2 BOTTOM VIEW A55 YO MAIN DRIVER Figure 5 16 YO Main Driver ASS Adjustments Location 5 40 Adjustments HP 8340B 41B ...

Page 151: ...W3 DIRECTIONAL COUPLER OUTPUT Figure 5 17 Top View Cable Location HP 8340B 41B Adjustments 5 41 5 42 ...

Page 152: ...e YO Loop NOTE The YO frequency adjustment in Paragraph 5 28 must be completed before these adlustments are made SPECTRUM ANALYZER Ik 7 7 0 00 0 00 00 CC 0 0 moono O m 00 Z 0 nn 00 O DL 00OO 0 G e 0 osci LLOSCOPE lIP 8340B OPT 001 lii noon II flII I noon IlL ZI29E il SWEEP OUT ADAPTER APC 3 5 f to APc 3 5 f I 0 CC I 0 CC Z AXS I 0 C 0 0 L __ 0 0 55 1 CH A I NPUT L RF ADAPTER SMA ni to BNc f OH B I...

Page 153: ...hat connects to A49J2 2 Connect the test equipment as shown in Figure 5 18 do not connect the Spectrum Analyzer yet Set the LINE switch to ON and allow hour warmup 3 Set the Sweep Generator as follows a Press INSTR PRESET b Press CF center frequency 1 8 7 MHz c Press AF then enter 2 0 0 MHz d Press POWER LEVEL then enter 3 dBm e Press SWEEP TIME then enter 1 0 msec 4 Set the oscilloscope controls ...

Page 154: ...ESET b Press CW then enter 4 5 GHz c Connect a jumper between A59TP4 and A59TP5 This disables the UNLK annunciator cir cuit 11 Set the Sweep Generator as follows a Press INSTRPRESEST b Press POWER LEVEL then enter 3 dBm c Press CW then enter 1 8 6 MHz d Press SHIFT then CW press STEP keys to select 1 kHz resolution BOTTOM VIEW 48 A48 YO LOOP Selected SAMPLER Selected Value IMPEDANCE MATCH Figure 5...

Page 155: ... CWJthen adjust the rotary knob to set a frequency that will produce a center frequency readout on the Spectrum Analyzer of 25 0 MHz See Figure 5 21 Turn off SIGNALTRACK on Spectrum Analyzer 14 On the OUT adjust A48R1 IF GAIN for a 25 MHz signal displayed on the Spectrum Analyzer of approximately 0 dBm 15 Set the Spectrum Analyzer as follows a Press INSTRPRESET b Set CENTER FREQUENCY to 50 MHz c S...

Page 156: ... Verify that the IF frequency response fallswithin the limits shown in Figure 5 22 If it doesnot select new values for A48C22 and A48R22 to adjust the shape of the response particularly in the 20 to 30 MHz region Readjust A48R1 IF GAIN control if necessary 17 Set the OUT s LINE switch to STANDBY Disconnect all test cables going to the OUT 18 Remove the jumper between A59TP4 and A59TP5 19 Reinstall...

Page 157: ...0051 green LED being lit 24 On the OUT press INSTRPRESET CW 3 GHz 25 Set up the Spectrum Analyzer as follows INSTR PRESET Press TRACKING GENERATOR AMPLITUDE Fully Clockwise 0 dBm INPUT IMPEDANCE 1 Megohm AUTO RANGE OFF REF LVL TRK OFF START FREQ 0Hz STOP FREQ 100 kHz dB div 1 dB div REF LEVEL 25 dBm RANGE use STEP keys 15 dBm 26 A trace similar to Figure 5 25 Waveform A should be displayed on the ...

Page 158: ...low 30 kHz the value of A49R18 on the A49 YO Phase Detector board should be decreased in value to increase the crossover frequency If the crossover fre quency is above 40 kHz the value of A49R18 should be increased to lower the crossover fre quency 30 Disconnect all test equipment from the OUT and reinstall the jumper Wi on the A49 Phase Detector board 31 Proceed directly to Adjustment 5 9 FM Accu...

Page 159: ... SCHEMATIC DIAGRAM TO HP 3595A TRACKING GENERATOR INPUT T I TO d5 ON A4B J2 TO d6 ON A49 Figure 5 23 Special Test Fixture Fabrication Instructions 1 of 2 I 0110 I I I 101 I I I L TO HP 3585A SPECTRUN ANALYZER I NEGOHN INPUT 5 50 Adjustments HP 8340B 41B ...

Page 160: ...T SLIDE CHASSIS MOUNT BNC F LOCK WASHER NUT 71 00 1 207 3101 0163 3101 0070 only requires a SPOT 1250 0212 2190 0016 2950 0001 1 1 1 1 1 1 CHASSIS MOUNT SNAP ON M LOCK WASHER NUT 10kg 1 4W RESISTOR 100 W RESISTOR 5 1iK 1 4W RESISTOR 1250 0691 2190 0124 2950 0078 0757 0442 0757 0401 0757 0438 Figure 5 23 Special Test Fixture Fabrication Instructions 2 of 2 BOTTOM VIEW Ji HP 8340B 41B Adjustments 5 ...

Page 161: ...M A WAVEFORM B Figure 5 25 Spectrum Analyzer Waveforms of VO Loop Gain TRACK I NO GENERATOR OUT VO LOOP N SERVICE P05 I T ION SPECIAL TEST F I XTURE CONNECT ALL CABLES AS NORMAL ON THE YO LOOP Figure 5 24 YO Loop Gain Test Setup 5 52 Adjustments HP 8340B 41B ...

Page 162: ...adjusted properly the power of the OUT s carrier frequency will be nulled minimum power level In the FM overmodulation adjustment portion of this adjustment the OUT is initially set up for its maximum frequency deviation and modulation rate From this point the rate is increased until the OUT s FM circuitry reaches its maximum capability The modulation rate is then decreased until the circuitry sta...

Page 163: ...he DVM to measure ac volts Set up the function generator for a 100 kHz sine wave Adjust the function generator s amplitude for 0 16996 Vrms measured on the DVM You may not be able to set the function generator s amplitude for this exact voltage so adjust the voltage as close as possible 4 Press FM on the OUT to turn FM off Adjust the spectrum analyzer to center the OUT s 10 GHz output carrier freq...

Page 164: ... Set the oscilloscope for 0 01 V div ac coupled and 0 5 us div The oscilloscope display should look similar to Figure 5 27 10 Adjust A49R3 until the OVERMOD annunciator on the OUT s front panel turns on then adjust A49R3 until the OVERMOD annunciator just turns oft 11 Disconnect all of the test equipment from the OUT Reinstall the cover onto the A49 Phase Detector assembly and reinstall the YO Loo...

Page 165: ...B Oscilloscope HP 1741A Adapter APC 3 5 f to Type N in HP P N 1250 1744 2 required for HP 8341 B one for HP 8340B Cable SMA in to SMA in HP P N 08340 20124 Adapter APC 3 5 f to APC 3 5 f required for HP 8340B HP P N 5061 5311 NOTE In the test setup 2 APC 3 5 f to Type N in adapters are used with an SMA semi rigid cable This setup is used instead of connecting the DUT to the spectrum analyzer with ...

Page 166: ... shown in Figure 5 28 and allow one halfhour warm up time YO KICK PULSE ADJUSTMENT 2 On the OUT make the following settings a Press INSTRPRESET b Press STARTFREQ then enter 2 3 0Hz c Press STOPFREQ then enter 6 9 9 9 0Hz 3 Adjust A54R36 PW Figure 5 30 for a 12 5 insec pulse on the oscilloscope Z AX I DUT ii Figure 5 29 YO Delay Compensation Test Setup 5 58 Adjustments HP 8340B 41B ...

Page 167: ...enter 6 9 GHz c Press STOPFREQ then enter 1 3 5 GHz d Press Ml then enter 7 1 2 GHz e Press AMTDMKR on f Press SAVE then enter 2 g Press SWEEPTIME then enter 2 0 0 msec h Press SAVE then enter 1 Press Frequency Marker OFF j Press M2 then enter 1 3 2 GHz k Press SAVE then enter 3 I At ENTRY pad press AUTO sweep time m Press SAVE then enter 4 n Press RECALL then enter 1 Figure 5 30 YO Delay Compensa...

Page 168: ... press RECALL then enter 2 Press RF to turn RF power off 13 Adjust the oscilloscope horizontal position to place the beginning of the marker at the center line of the screen 14 On the OUT press RF key to turn RF power on Adjust A54R32 COFF to set the peak of the signal at the center of the oscilloscope screen 15 On the OUT press RECALL then enter 3 16 On the Spectrum Analyzer press CENTER FREQUENC...

Page 169: ...he oscilloscope screen 25 On the OUT press RECALL then enter 1 Repeat steps 7 through 24 until no further adjust ment of A54R30 CGN and A54R32 COFF is necessary 26 Disconnect all of the test equipment and reconnect the cables BEGINNING OF MARKER Figure 5 31 Z Axis Marker Waveform Figure 5 32 Amplitude Marker Waveform HP 8340B 41B Adjustments 5 61 5 62 ...

Page 170: ...he LO signal for the sampler and adjusts for maximum output The oscillator phase lock loop is then opened by removing jumper A8E3 and the balance is adjusted at the output of the sampler to obtain a syinetrical square wave of approximately 35 Volts peak to peak to drive the phase lock amplifier OSCI LLOSCOPE DIGITAL VOLTMETER INPUT AR R4 A8C4 100 MHz PEAK 3 7 GROUND FROM by NOTE ONLY MAKE TEST EQU...

Page 171: ...A8R4 4 Remove the Jumper A8E3 Connect a jumper from the 10 volt terminal to the lower connection point for E3 as shown in Figure 5 33 This applies 10 volts to the oscillator 5 Connect the Oscilloscope 10 1 high impedance probe to the upper connection point for E3 as shown in Figure 5 33 Switch the OUT on 6 Adjust A8R8 BAL for a 50 duty cycle square wave with approximately 35 Volts peak to peak 7 T...

Page 172: ...Marker Band Crossing Test Setup Equipment Digital Voltmeter HP 3456A Procedure MANUAL SWEEP GAIN 1 Place the OUT inthe test position and connect the test equipment as shown in Figure 5 34 Allow one half hour for warmup 2 Set the OUT as follows a Press INSTRPRESET b Press START then enter 4 GHz c Press STOP then enter 5 GHz d Press MANUAL Sweep e Press SHIFT GHz 1 3 Hz SHIFT MHz 2 Hz and SHIFT kHz ...

Page 173: ...A57TP5 SWEEP OUT and OVM s ground lead to A58TP9 RGND 6 Adjust A57R32 EOS Figure 5 35 for an indication on the DVM of 10 000 0 0008 Vdc 7 Press CONT Sweep key after each adjustment is made for an update of end of sweep indication 8 Repeat steps 6 and 7 until no further adjustment is needed BOTTOM VIEW A57R33 MAN GAIN Manual Gain A57R32 EOS End of Sweep A57 MARKER BANDCROSS A57TP5 SWEEP OUT F Figur...

Page 174: ...56A Procedure 1 Place the OUT in the testposition as shown in Figure 5 36 with bottom coverremoved and the A58 Sweep Generator assembly on an extender board Connect the oscilloscope to A58TP4 MKR RMP Turn the OUT s LINE switch ON and allow one half hour warm up time SWEEP RAMP GAIN ADJUSTMENT 2 On the OUT press INSTRPRESET STARTFREQI and enter 2 3 GHz 3 Press STOPFREQI then enter 7 GHz 4 Press SWE...

Page 175: ...TOR A58 Cont d BOTTOM VIEW A58 SWEEP GENERATOR A58TP4 MKR RAMP A58R1 SWP GAIN A58R13 SWP TIME A58R4 Figure 5 37 Sweep GeneratorAdjustments Location 10 mSEC Figure 5 38 Sweep Ramp at A58TP4 5 68 Adjustments HP 8340B 41B ...

Page 176: ...c Press STOPFREQ then enter 7 GHz d Press SHIFT MHz 2 3 Hz SHIFT kHz 0 Hz to stop the sweep at the end of sweep 7 GHz 11 Record the reading at on the OVM 12 Connect the OVM to A58TP1O VSWP 13 Adjust A58R13 SWP GAIN control so that the DVM reading at A58TP1O 94 of reading at A58TP4 taken in step 11 EXAMPLE a DVM reading in step 11 at A58TP4 9 9884 Volts b 0 94 9 9884V 9 38909 Volts c Adjust A58R13 ...

Page 177: ...power loss through the SYTM is minimum therefore SYTM tracking is adjusted while viewing power out versus frequency and adjusting the SYTM for maximum power out In the multiplying bands Bands 2 3 and 4 optimum biasing of the step recovery diode SRD internal to the SYTM is also required for maximum power out Sincethis the case the SRD bias adjustments on the A24 and A26 assemblies are also performe...

Page 178: ...nd detector as shown in Figure 5 40 Connect the DVM to the OUT s rear panel 0 5 V GHz output BNC Switch the OUT s LINE switch ON and allow the equipment to warm up for one half hour INITIAL SETTINGS NOTE Oncethese initial settings have been made it will be necessaryto com plete this procedure and the Leveled RF Output adjustments 2 Access the OUT s Calibration Constants by pressing the following k...

Page 179: ... 24 R3 R4 R5 X2A X2B X2C Ri OFF A OFF B R6 R7 R8 R9 X3C X4A 26 Figure 5 41 Unleveled RF Output Adjustments Location 1 of 2 RiO X4B TP1 2 SRO BIAS Ru X4C Ri 2 MIN R88 lIP 8340B 41B Adjustments 5 73 ...

Page 180: ...3 DYS DYC OFST KICK R67 V GZ R24 m 71 flflW E BP2 I FREO KITFB _______ R82 R25 WF WWW ON FREC w WWW flWWW L GAIN R13 Q L WEWn DRP L W W WWW WWI LEWWWWWZ Figure 5 41 Unleveled RF Output Adjustments Location 2 of 2 5 74 Adjustments HP 8340B 41B ...

Page 181: ...s assembly has been replaced preset the following potentiometers pots to the position stated see Figure 5 41 Center the following A24R3 X2A A24R4 X2B Set the following fully counter clockwise A24R1 OFF A A24R2 OFF B A24R8 X3C A24R11 X4C 5 If the A13 SYTM orthe A28 SYTM Driver assembly has been replaced presetthe following potsto the position stated see Figure 5 41 A24R6 X3A A24R7 X3B A24R9 X4A A24...

Page 182: ...vity CHAN A to 0 05 V Div dc Adjust the horizontal and vertical position controls to view the entire swept RF output response on the oscilloscope Readjust the vertical sensitivity if necessary so that the trace covers the maximum number of divisions possible Band 2 Adjustments 10 Adjust A28R82 GAIN to peak the power across the entire band readjust the scope s vertical position and or sensitivity i...

Page 183: ...decrease while adjusting one of these potentiometers pots clock wise i e power reversal squegging adjust the pot counter clockwise until the power is peaked again and then continue turning the pot counter clockwise until the power is reduced 0 5 dB It may be desirable to optimize the power in one half of the band maximum power with no squegging even though squegging is induced in the other half On...

Page 184: ...e detector from the OUT and connect the power meter and power sensor Again slowly vary the rotary knob and determine the power level of the minimum power point If it is still c1 dB above the maximum leveled power specification press RECALL 1 on the OUT and repeat steps 9 through 15 Band 3 Adjustments 16 On the OUT press STARTFREQ 1 3 3 5 GHz STOPFREO 2 0 GHz CONT SAVE 1 Adjust the scope s vertical...

Page 185: ...is point while observing the OUT s POWER dBm display The minimum power displayed should be 1 dB above the maximum leveled power specification for the OUT in Band 3 13 35 to 20 GHz If this is not the case disconnect the detector from the OUT and connect the power meter and power sensor Again slowly vary the rotary knob and determine the power level of the minimum power point If it is still 1 dB abo...

Page 186: ...the OUT Using the OUT s rotary knob adjust Cal Constant 74 to peak the power across the entire band adjust above and below 1024 29 Repeat step 26 30 Note the position of the minimum power point on the scope On the OUT press MANUAL Adjust the OUT s rotary knob until the dot on the scope is near the position noted as the minimum power point Slowly vary the position of the dot around this point while...

Page 187: ... Hz NOTE The range for the delay compensation Cal constants numbers 2 through 8 is 0 to 131 Ifthe Cal Constants do not provide sufficient range for the delay compensation Cal Constant 8 should be lowered Cal Constant 7 for the HP 8341 B A28R22 DYO and A28R19 DYS readjusted andthen the SYTM DELAY COMPENSATION ADJUSTMENTSBY BAND procedure should be repeated 36 Adjust A28R22 DYO for optimum power in ...

Page 188: ...onstant 7 by pressing SHIFT GHz 7 Hz SHIFT ENTRYOFF on the OUT 43 Using the OUT s rotary knob adjust Cal Constant 7 range is 0 to 131 to optimize the power across the entire Band If Cal Constant 7 is unable to optimize peak the majority of Band 3 at the same time 60 of the Band should peak at the same time then proceed with step 44 Otherwise proceed with step 50 44 On the OUT press 1 0 0 Hz to ret...

Page 189: ...LE SAVE 3 RECALL 2 Adjust the scope s vertical position and or sensitivity to view the swept display 52 Access Cal Constant 6 by pressing SHIFT GHz 6 Hz SHIFT ENTRYOFF on the OUT Using the OUT s rotary knob adjust Cal Constant 6 range is 0 to 131 to optimize the power across the entire Band 53 Press RECALL on the OUT and iterate between registers 1 and 2 by pressing 1 and then 2 Verify that the fa...

Page 190: ...slow sweep speed trace register 1 at any point If this condition is not met repeat steps 56 and 57 58 Iterate between registers 1 and 3 and verify that the single sweep trace register 3 is no more than 2 db below the slow sweep trace at any point After pressing 3 on the OUT you need to press SINGLE to initiate the single sweep If this condition is not met repeat steps 56 through 58 Multiband Delay...

Page 191: ... the fast sweep speed trace register 2 is no more than 1 dB below the slow sweep speed trace register 1 at any point ignore squegging which is most likely occurring in Band 1 Also the minimum power point on the fast sweep speed trace should be 1 dB above the maximum leveled power specifications for each band again ignore squegging in Band 1 If either of the above conditions are not met repeat step...

Page 192: ...the SRO unleveled bias Since unleveled squegging can be difficult to see using the oscilloscope this test is performed to determine if additional adjustments are required Equipment Required Synthesized Sweeper HP 8340B Option 001 10 dB Attenuator HP 8493C Option 010 Mixer HP P N 0955 0307 Spectrum Analyzer HP 8566B Adapters APC 3 5 f To Type N in required if OUT is HP 8341B HP P N 1250 1744 APC 3 ...

Page 193: ...lator to CW at 6 4 GHz Press PEAK to turn on peaking 72 Press INSTR PRESET on the OUT Press STARTFREQ and enter 71 GHzJ Press STOP FREQ and enter 1 3 5 GHz Press POWER LEVEL and enter 2 0 dBm UNLEVELED indicatorshould be on Press SHIFT CF and enter 1 0 0 MHz for a step size of 100 MHz Press MANUAL SWEEP and enter 71 GHz The mixer IF frequency is now 600 MHz 73 Set the Spectrum Analyzer as follows ...

Page 194: ...PFREQ and enter 2 0 GHz Press MANUAL and enter 1 3 5 GHz 77 Using the step keys as described in step 26 step through Band 3 If squegging occurs below 15 GHz adjust A24R6 X3A slightly CCW to eliminate the squegging If squegging occurs above 15 GHz adjust A24R7 X3B Band 4 Adjustments HP 8340B only 78 For Band 4 press the Local Oscillator STARTFREQ and enter 1 9 I 4 GHz Press STOPFREQ and enter 2 5 9...

Page 195: ...All or A12 Detector is replaced The logger in A25 has temperature compensation in both high and low bands This procedure calcu lates the values for the four factory selected resistors in the temperature compensation circuit DIGITAL VOLTMETER BAND 0 DETECTOR A12 W26 L l F HIGH BANDS DETECTOR All W27 F Ll Figure 5 45 Logger Temperature Compensation Test Setup n moonnan m 000 OODOOODOOOODOO POWER SUP...

Page 196: ...l an Extender Board in place of A25 4 Set the DVM forOhms measurement and connectthe input between pins 4 and 26 of the extender board Note the resistance measured This value is thermistor resistance RT and will be used for calculations in later steps 5 Connect the test equipment as shown in Figure 5 45 with cable W27 connector connected to an SMB to BNC adapter 6 Connect the DVM across the output...

Page 197: ...check that the output is still at 5 00 0 01 Vdc Move the DVM connections back to the SMB to BNC adapter as shown in Figure 5 45 12 Note indication on the DVM This value is VvM for low band and will be used for calculations in stepl3 13 Calculate Corrected Video Resistance in Low Band RvL as follows RVL RvM 680 X 24000 RT 4000 where RvL Corrected Video Resistance in Low Band RvM VvM X 200 Ohms mV V...

Page 198: ...tenuatorand ALC is setfor de coupled operation controlled separately The RF output level is set using the ENTRY keys The power is measured with a power meter and if necessary adjustments are made until the power meter indication is correct at each OUT power level Equipment Power Meter HP 436A Power Sensor HP 8485A Digital Voltmeter DVM HP 3456A Power Supply HP 6294A Adapters APC 3 5 f To Type N in...

Page 199: ...ong as one minute for the power meter indication to be accurate After making a power level change wait until the power meter indication stabilizes before making any adjustments 16 Refer to Table 5 8 below enter the appropriate OUT power level ALC level and check the power meter indication Check the indication at each power level and note the amount of error before making any adjustments If necessa...

Page 200: ...Bm ADJUSTMENT HAS SLIGHT EFFECT AT lOdBm NEGLIGIBLE ELSEWHERE P OUT 0 20 20 ALC REF r 20 V 20 ALC REF i lOclBm ADJUSTMENT STRONGLY AFFECTS l8dBm SLIGHTLY AFFECTS 0 NEGLIBIBLE ELSEWHERE lBclBm ADJUSTMENT HAS MODERATE EFFECT ON lOdBm SLIGHTLY LESS EFFECT AT ALL LOWER POWERS Figure 5 48 Typical ALC Adjustment Response Curves P OUT 0 20 20 P OUT 20 ALC REF 20 20 P OUT 0 0 20 5 94 Adjustments HP 8340B ...

Page 201: ...nd 0 contains broadband noise If the power meter is properly zeroed the broadband noise will be compensated and power measurements will be more accurate Press INT UNLEVELED annunciator off and then SHIFT PWRSWP attenuator and ALC should both indicate zero 19 Refer to Table 5 9 below enter the appropriate OUT power level ALC level and check the power meter indication Check the indication at each po...

Page 202: ...e following order 30 dBV 0 dBV 6 dBV 0 dBV 30 dBV and 60 dBv 22 Press INSTRPRESET Press CW and enter 4 5 GHz Press XTAL leveling The ENTRY DISPLAY should indicate ATN 0 dB REF 30 00 dBV Adjust calibration constant Number 45 for a OVM indication of 31 6 mV 0 3 inV Access Calibration Constant Number 45 by entering the following SHIFT GHz 4 5 Hz SHIFT MHz 1 2 Hz SHIFT kHz 2 2 Hz 23 Press POWERLEVEL a...

Page 203: ... ADJUSTMENT OFFSETS ENTIRE CURVE BY THE SAME AMOUNT CAL NO 45 6 0 LEVELED VOLTAGE clBV 30 60 60 0 6 REF dBV 0dBV ADJUSTMENT ROTATES CURVE ABOUT THE 3OdBv POINT THUS IT AFFECTS 60 AND 6cIBV STRONGLY CAL NO 48 0 6 REF cIBV 6dBV ADJUSTMENT HAS STRONG EFFECT ON OdBV NEGLIGIBLE ELSEWHERE A25R88 Figure 5 49 Typical External Leveling Response Curves 30 0 6 30 30 HP 8340B 41B Adjustments 5 97 ...

Page 204: ...T 28 Set up the following equipment as shown in Figure 5 50 with the power supply set to 0 Vdc Allow the equipment to warm up for at least 30 minutes DUT POWER METER ADAPTER APC 3 5 f to N m Figure 5 50 AM GAINAdjustment Test Setup 29 Calibrate the power meter and then set the calibration factor switch for a 1 5 GHz measurement Connect the power sensor to the OUT s RF output 30 Press the following...

Page 205: ...ge adjust A26R91 AM GAIN for a power meter indication within the given range 34 Repeat steps 32 and 33 until the power level requirements are met for each step NOTE If adlustments of the calibration constants were made in this procedure the data thus stored in the working memory area should be copied to the protected memory area by pressing the following key sequence SHIFT MHz 1 4 Hz SHIFT kHz 5 3...

Page 206: ...D internal to the SYTM for optimum bias and to eliminate the possible occurrence of squegging In the next procedure the ALC loop gain in each band is adjusted for optimum operation A final section checks the RF output signal with a Spectrum Analyzer forthe appearance of squegging in any of the bands and allows a last fine adjustment to eliminate any squegging that is observed Figure 5 52 Leveled P...

Page 207: ...trol of the linear modulator circuit 3 Adjust the front panel rotary knob RPG for a DVM indication of 0 00 V 3 mV then note the indication in the POWER dBin display Adjust A26R88 MO counter clockwise to decrease the POWER dBin indication by 0 2 dB LEVELED BIAS 4 Disconnect the DVM and connect the oscilloscope as shown in Figure 5 52 5 Set the oscilloscope as follows DISPLAY CHANNEL A CHAN A 0 02 V...

Page 208: ... X3B R8 R9 X3C X4A TPi2 SRD BIAS Ri2 MIN Ru X4C RiO X4B 26 R45 R47 R49 R51 Xl X2 X3 X4 0 z _ DDfl _ CD II _ II LIZ tmL J LI QEZ I ll Figure 5 53 SRD Bias Adjustments on A24 and A26 Ri OFF A R2 OFF B R88 MO HP 8340B 41B Adjustments 5 103 ...

Page 209: ...ter clockwise 10 Set the oscilloscope as follows DISPLAY CHOP CHAN A 0 05 V Div DC COUPLED CHAN B 0 05 V Div DC COUPLED The oscilloscope display should look similar to Figure 5 55 LEVELED POWER SRO BIAS ADJUSTMENT 11 Adjust A24R1 OFF A for optimum display as shown in Figure 5 55 Waveforms A B and C 12 On the OUT press CW 1 3 GHz Adjust A24R2 OFF B for optimum trace as shown in Figure 5 55 Waveform...

Page 210: ...DJUSTOFFSETA CONTROLCLOCKWISE TO IMPROVE WAVEFORM 4 I 4 4 4 l t 4 4 4 4 I 4 t Th 4 4 w i IIVLV Li_ C BAD CH B SRD BIAS ADJUST OFFSET A CONTROL COUNTER CLOCKWISE TO IMPROVE WAVEFORM D GOOD CH A MOD LVL E BAD CH A MOD LVL Figure 5 55 Typical MOD LVL and SRD BIAS Waveforms HP 8340B 41B Adjustments 5 105 STRAIGHT LINE LOOP GOES UNLEVELED CURVED LINE ...

Page 211: ...tep keys step through Band 2 from 7 to 13 4 GHz and readjust A24R5 X2C if necessary to improve the MOO LEVEL trace Also adjust A24R1 OFF A and A24R2 OFF B if necessary to optimize the SRD Bias as in step 19 above If any adjustments are made stepthrough Band 2 again until the SRD bias and the MOD LEVEL trace is optimized It will not be possible to adjust the MOD LEVEL trace for optimum at each step...

Page 212: ...nect CHAN A of the oscilloscope to A26TP3 MOD LVL Connect CHAN B to A25TP2 DET Set up the oscilloscope as follows DISPLAY CHOP CHAN A O 05V Div DC COUPLED CHAN B O 05V Div DC COUPLED TRIGGER EXT POS TIME Div 5 inS SWEEP VERNIER ON 24 On the OUT press INSTRPRESET SWEEP TIME 5 0 msec Press SHIFTI PWRSWP 1 2 0 dBm Press PWRSWP 4 0 dBm Press SHIFT CF 2 0 0 MHz and then AM to turn AM on Press CW 1 0 MH...

Page 213: ...h the trace up to where it deviates from a flat line see Figure 5 56 Waveform C This point on the display will change position with frequency 25 On the oscilloscope invert CHAN B and select DISPLAY A B mode Using the OUT s step keys step the CW frequency through Band 0 from 10 MHz to 2 21 GHz and adjust A26R43 HET for the most horizontal line across Band 0 26 On the OUT press CW 2 3 GHz Using the ...

Page 214: ...OUT s step keys step the CW frequencythrough Band 4 from 20 0 to 26 4 GHz and adjust A26R51 X4 for the most horizontal line across Band 4 2 AX I S BLANK MKRS OSCI LLOSCOPE LEVELED BIAS BANDS 2 THROUGH 4 30 Remove the oscilloscope probes and connect the detector and oscilloscope as shown in Figure 5 57 On the OUT press INSTRPRESET RECALL 2 Press SWEEP TIME AUTO Press SHIFT PWRSWP 2 0 dBm 31 Setthe ...

Page 215: ...z SHIFT PWR SWP 2 0 dBm Set the oscilloscope s vertical sensitivity to 0 005 V Div Vary the ALC level as in step 32 and check for squegging If any squegging occurs examine the ENTRY DIS PLAY to determine the requested ALC level If the ALC level is at or below the maximum specified leveled power adjust A24R8 X3C counter clockwise to eliminate the squegging If the ALC level is above maximum leveled ...

Page 216: ... squegging of the OUT will appear as a spurious response on the IF signal This test should be performed after SYTM tracking and delay and SRD unleveled bias adjustments Equipment Synthesized Sweeper HP 8340B Option 001 10 dB Attenuator HP 8493C Option 010 Mixer HP P N 0955 0307 Spectrum Analyzer HP 8566B Adapters APC 3 5 f To Type N in HP P N 1250 1744 required if OUT is an HP 8341 B APC 3 5 f to ...

Page 217: ...as shown in Figure 5 60 If squegging occurs adjust A24R5 X2C slightly CCW to eliminate the squegging Note if the control is adjusted and there is no effect on the signal the signal is probably a mixing product NOTE Test for squegging at power levels from maximum leveled powerto 20 dBm in 5 dB increments OUT SYNTHESIZED SWEEPER LOCAL OSCILLATOR 42 On the OUT press SHIFT PWRSWP and enter the maximum...

Page 218: ... that will be a 5 dB increment below max leveled power i e 10 5 Repeat step 45 at this power level Enter the next 5 dB increment and repeat step 45 until the test for squegging has been performed from maximum leveled power to 20 dBin This completes Leveled RF Output Adjustments for an HP 8341B If testing an HP 8340B continue with step 47 Figure 5 60 Squegging Displayed on Spectrum Analyzer 47 For ...

Page 219: ... levels from maximum leveled powerto 20 dBm in 5 dB increments 50 Press the OUT s SHIFT PWRSWP and enter the maximum ALC power level that will be a 5 dB increment below max leveled power i e 5 0 5 Repeat step 49 at this power level Enter the next 5 dB increment and repeat step 49 until the test for squegging has been performed from maximum leveled power to 20 dBin 5 114 Adjustments HP 8340B 41B ...

Page 220: ...e sweeping Flatness corrections are made by modifying the appropriate Calibration Constants OUT OSCI LLOSCOPE HP1741A HP436A HP8485A HP8481A Oscilloscope Power Meter Power Sensor Power Sensor Adapters APC 3 5 f to APC 3 5 f HP P N 5061 5311 required for HP 8340B to HP 8485A connection APC 3 5 f Type N in HP P N 1250 1 744 required for HP 8341B to HP 8485A connection APC 3 5 f to Type N f HP P N 12...

Page 221: ... 1 and terminate the entry by pressing dBm Save this instrument state by pressing SAVE 1 5 Set the oscilloscope to A vs B Set the horizontal sensitivity CHAN B for 1 V Div and the vertical sensitivity CHAN A for 0 1 V Div Adjust the oscilloscope s vertical position control to center the trace on the oscilloscope Adjust the horizontal position control to display the entire trace 6 On the OUT press ...

Page 222: ...ft to right 7 0 13 5 and in the case of the HP 8340B 20 0 0Hz The bandcross points are the points at which the sweep pauses and the power drops to a minimum for an instant Adjust Cal Constant 14 for the flattest trace from 2 4 to 9 GHz Press the OUT s step keyto access Cal Constant 15 and adjust Cal Constant 15 and A27R4 BK PT1 for the flattest trace from 9 to 20 GHz If adjusting an HP 8340B press...

Page 223: ...R LEVEL 0 dBm Set the power meter s CAL FACTOR dial for the 100 MHz CAL FACTOR indication on the power sensor 14 Connect the power sensor to the OUT s RF output and then press RF on the OUT to turn the RF off Zero the power meter To ensure that the power meter is properly zeroed select WATT mode and press the ZERO button until the power meter indicates 0 02 on the most sensitive range Select the d...

Page 224: ... to set the ALC at 0 dBin The RF attenuator should also be at 0 dB If it is not use the a step key to set it to 0 Press AM to turn the AM on 21 On the OUT press SHIFT 0Hz 4 2 Hz SHIFT ENTRYOFF to access Cal Constant 42 Adjust Cal Constant 42 50 the OUT s POWER dBm display shows 0 00 dBm 22 On the OUT press SHIFT PWRSWP 2 0 dBm to set the ALC level to 20 dBin Press SHIFT GHz 4 0 Hz SHIFT ENTRY OFF ...

Page 225: ...eedthrough RF Section Description The detector sample and hold balance is adjusted for best continuity across the trailing edge of the pulse waveform The timing is adjusted for maximum negative level The integrator gate balance is set for the flattest pulse envelope OSC I ILOSCOPE PULSE GENERATOR Figure 5 64 Pulse Adjustment Setup HP 8340B 41B Adjustments 5 121 ...

Page 226: ... f to APC 3 5 f HP P N 5061 5311 required if OUT is an HP 8340B APC 3 5 f to Type N in HP P N 1250 1 744 required if OUT is an HP 8341 B BNC f to Dual Banana HP P N 1251 2277 BNC Tee HP P N 1250 0781 Procedure If the OUT is equipped with Option 006 Delete Pulse Modulation proceed directly to step 16 DETECTOR SAMPLE AND HOLD BALANCE ADJUSTMENT 1 Connect equipment as shown in Figure 5 64 Allow at le...

Page 227: ... R58 BAL R7 TP3 26 BAL MOD LVL mEL ELI 77 _ LLIH LI L ELI 0 C Fl Iii LIZ ELI LIThQ 6 tJ LELI __ L LIZ ELI __ ELI LIZ LI ELI ELI LIZ LI _ 6 H z D ELI iK I _ Figure 5 65 Pulse Adjustments Location 25 HP 8340B 41B Adjustments 5 123 ...

Page 228: ... trace should be similar to Figure 5 66 6 Adjust A25R58 BAL control for best continuity flat line across the pulse trailing edge NOTE A25 must not be on an extender board when viewing trace SAMPLE AND HOLD TIMING ADJUSTMENT 7 Set the pulse generator for a pulse width of 120 nanoseconds On the OUT press SHIFT PWR SWP and enter 1 0 dBm Then press SHIFT SLOPE and use the STEP keys to set attenuator t...

Page 229: ...RATOR GATE BALANCE ADJUSTMENT 14 Set the pulse generator for a pulse width of 5 microseconds and a pulse period of 20 microse conds Set oscilloscope to 1 lisec Oiv 15 On the OUT press PULSE SHIFT AM and adjust A26R7 BAL for the flattest pulse envelope on the CH A display Press AM OFF and the pulse envelope should be flatter Proceed to step 23 SLOW PULSE MODULATION COURSE ADJUSTMENT NOTE Steps 16 t...

Page 230: ...C tee directly to the OUT s PULSE connector Allow 30 minutes for the instruments to warm up 24 Set the oscilloscope as follows DISPLAY CHANNEL B CHAN A 0 1 V Oiv 50 Ohms CHAN B 5 V Oiv 50 Ohms TRIGGER INT CHAN B TIME Div 5 usec 25 Set up the pulse generator for a 25 kHz 8divisions on the oscilloscope 5V peak 10 V p p square wave The damage level forthe OUT s PULSE input is 12V 20V so do not overdr...

Page 231: ...H26R7 IBHL Preset Full Clockujise 5 uS oiv b H2STF3 Pfter H 5P58 BRL Pdjusted 5 uS div V I m A c H2ETP R ter H26P7 BHLI Hdjusted Figure 5 68 A26TP3 Typical Waveforms 0 VIEW A E VIEW B Cu Cu A VIEW C E Cu 71 HP 8340B 41B Adjustments 5 127 ...

Page 232: ...ULSE GENERATOR 0000000 9 00 0000 000 0 000 00 0000 0000 oo 00 0 0000 0 0 0 0 0 0 CCC CCCOC LOW PASS F I LTER MIXER 10dB ATTENUATOR ADAPTER APC 3 5 f to N n 8341B ONLY ADAPTER APC 3 5 f to APC 3 5 f 8340B ONLY DUT Figure 5 69 Slow Pulse Modulation Fine Adjust Setup 5 128 Adjustments HP 8340B 41B ...

Page 233: ...d for the correct OVM reading and the correct POWER dBm DISPLAY reading DUT DIGITAL VOLTMETER Equipment Digital Voltmeter OVM HP 3456A Detector Positive HP 8473C Option 003 Adapters APC 3 5 f to APC 3 5 f HP P N 5061 5311 required for HP 8340B only APC 3 5 f to Type N in HP P N 1250 1 744 required for HP 8341B only BNC f to Dual Banana HP P N 1251 2227 BNC Tee HP P N 1250 0781 a za 0000 Th 00 0000...

Page 234: ...ob adjust Cal Constant 35 range is 100to 100 until the DVM reads 0 000 V 2 my 4 Using the OUT s step key access Cal Constant 37 Using the OUT s rotary knob adjust Cal Constant 37 range is 100 to 100 until the OUT s POWER dBm display indicates 0 0 dBm 5 On the DUT press SHIFT XTAL 1 0 dBm to set the external module power to 1 10 dBm Press SHIFT GHz 3 6 Hz SHIFT ENTRYOFF to access Cal Constant 36 6 ...

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