HP 54501A User Manual Download

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Summary of Contents for 54501A

Page 1: ... 2816A 2833A 2842A 2906A and 2913A For additional information about serial numbers see INSTRUMENTS COVERED BY MANUAL in Section 1 COPYRIGHT HEWLETT PACKARD COMPANY COLORADO SPRINGS DIVISION 1988 1900 GARDEN OF THE GODS ROAD COLORADO SPRINGS COLORADO U S A ALL RIGHTS RESERVED Manual Part Number 54501 90906 Microfiche Part Number 54501 90806 PRINTED 28 FEBRUARY 1989 ...

Page 2: ... software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer...

Page 3: ...al Packaging 2 1 2 8 Other Packaging 2 1 2 9 Preparation for Use 2 2 2 10 Power Requirements 2 2 2 11 Line Voltage Selection 2 2 2 12 Power Cable 2 2 2 13 Applying Power 2 2 2 14 Cleaning Requirements 2 2 SECTION 3 PERFORMANCE TESTS 3 1 Introduction 3 1 3 2 Equipment Required 3 1 3 3 Test Record 3 1 3 4 Selftest Verification 3 1 3 5 Bandwidth Performance Test 3 2 3 6 Offset Accuracy Test 3 3 3 7 T...

Page 4: ...E 6 1 Introduction 6 1 6 2 Safety Considerations 6 1 6 3 Logic Convention 6 1 6 4 Block Level Theory of Operation 6 2 6 5 Power Supply Assembly 6 2 6 6 Display Monitor Assembly 6 2 6 7 System Board Assembly 6 2 6 8 Keyboard Assembly 6 2 6 9 System Board Assembly Theory of Operation 6 4 6 10 Data Acquisition 6 4 6 11 System Control 6 7 6 12 Troubleshooting 6 9 6 13 Troubleshooting Flowcharts 6 9 6 ...

Page 5: ...onfigurations 2 3 3 1 Bandwidth Performance Test Setup 3 3 3 2 Delta t Accuracy Test Result 3 7 4 1 HP 54501A Power Supply Assembly Testpoints and Adjustment Locations 4 2 4 2 HP 54501A CRT Test Display 4 3 4 3 Adjustment Locations of HP 54501A CRT Monitor Assembly 4 4 4 4 HP 54501A System Board Assembly Component Locator 4 8 5 1 HP 54501A Exploded View 5 2 6 1 HP 54501A Simplified Block Diagram 6...

Page 6: ... use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard o Do not operate the instrument in the presence of flammable gasses or fumes Operation of any electrical Instrument in such an environment constitutes a definite safety hazard SAFETY CONSIDERATIONS o Do not Install substitute parts or perform any unauthorized modification to the instrument o Adjustments ...

Page 7: ...ction 1 1 1 2 Instruments Covered by Manual 1 1 1 3 Instrument Description 1 1 1 4 Accessories Supplied 1 1 1 5 Accessories Available 1 2 1 6 Specifications 1 2 1 7 Operating Characteristics 1 2 1 8 General Characteristics 1 2 1 9 Recommended Test Equipment 1 9 ...

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Page 9: ... The manual for this instrument is accompanied by a yellow Manual Changes supplement This supplement contains the necessary change information that explains how to adapt the manual to the newer instrument HP 54501A GENERAL INFORMATION SECTION 1 GENERAL INFORMATION In addition to change information the supple ment may contain information for correcting errors in the manual To keep this manual as ac...

Page 10: ...er formance standards or limits for which the os cilloscope is tested 1 7 OPERATING CHARACTERISTICS Table 1 2 is a list of the operating characteris tics of the HP 54501A Digitizing Oscilloscope The operating characteristics are a summary of performance capabilities of the HP 54501A 1 8 GENERAL CHARACTERISTICS Table 1 3 is general characteristics of the HP 54501A Digitizing Oscilloscope The genera...

Page 11: ...easurement after visual time null calibration has been done TRIGGER SENSITIVITY 5 mv div dc 20 MHz 0 1 X full scale 20 MHz 100 MHz 0 25 X full scale All other dc 20 MHz 0 05 X full scale 20 MHz 100 MHz 0 125 X full scale CHARACTERISTICS VERTICAL RESOLUTION 0 4 6 bit A D Since expansion is used for 5 mV div range A D resolution is 7 bits 0 8 in that range 0 1 10 bits via HP IB with averaging MAXIMU...

Page 12: ...Table 1 2 HP 54501A Operating Characteristics Reference location The reference point may be located at the left edge center or right edge of the display For zero delay the reference point is the trigger point For non zero delay the reference point is equal to the trigger point plus the delay time TRIGGER MODES Edge trigger Positive or negative edge may be selected for trigger on any of the four ch...

Page 13: ...se that meets a selectable time range The trigger is an occur rence of a rising or falling edge of the source after the qualifying pulse The time settings for the qualifier are selectable from 20 ns to 160 ms The trigger occurrence value is selectable from 1 to 16 000 000 NOTE All TV trigger modes require a clamped video signal for stable triggering Use the HP 1133A TV Video Sync Pod to provide cl...

Page 14: ...forms 16 automatic pulse parameter measurements from the front panel and additional measurements via HP IB including ALL OVERSHOOT and PRESHOOT The standard measurements are performed with 10 50 and 90 voltage thresholds as defined by IEEE Standard 194 1977 IEEE Standard Pulse Terms and Definitions User definable Measurement Thresholds The HP 54501 A lets you set your own thresholds for auto matic...

Page 15: ... the memory to Its last state completion criteria 100 with the oscilloscope at a prior to selection time div setting of 5 A s dIv Show Displays Instrument status Including Data Transfer Rates Approximately 120 Kbytes s volts div offset and trigger condition Probe Compensation Output An approximately HARDCOPY The CRT display Including menus 1 5 MHz signal Is provided for probe compensa and measurem...

Page 16: ... operating Random vibration 5 500 Hz 10 minutes per axis 2 41 G rms Resonant search 5 to 500 Hz swept sine 1 oo tave minute sweep rate 0 758 5 minute resonant dwell 4 resonances per axis P b S 439 4 17 3 362 5 14 3 I 355 6 14 0 Weight 194 3 7 65 Power Requirements Voltage 115 230 Vac 25 to 15 48 66 Hz Power 350 VA maximum Net approximately 10 kg 22 lb Shipping approximately 20 kg 44 lb Dimensions ...

Page 17: ... WAVE 100 Hz to 1 kHz HP 8116A A GENERATOR 300 mV p p to 5 V p p POWER 100 MHz frequency range HP 436A P METER 02 dB accuracy POWER HP 436A compatibility HP 8482A P SENSOR BNC TEE m to f f HP 1250 0781 P 50 OHM Accuracy 1 HP 101000 A P TERMINATION TYPE N m 24 inches m to m HP 11500B A P CABLE TYPE N f N f to BNC f HP 1250 1474 P BNC ADAPTER BNC 50 OHM BNC f to dual HP 1251 2277 A P ADAPTER banana ...

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Page 19: ...Environment 2 1 2 4 Storage and Shipping 2 1 2 5 Packaging 2 1 2 6 Tagging for Service 2 1 2 7 Original Packaging 2 1 2 8 Other Packaging 2 1 2 9 Preparation for Use 2 2 2 10 Power Requirements 2 2 2 11 Line Voltage Selection 2 2 2 12 Power Cable 2 2 2 13 Applying Power 2 2 2 14 Cleaning Requirements 2 2 ...

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Page 21: ...erating environment for the HP 54501 A is described in table 1 2 Note the non condensing humidity limitation Condensation within the instrument cabinet can cause poor operation or malfunction Protection should be provided against temperature extremes which cause condensation within the instrument HP 54501A INSTALLATION SECTION 2 INSTALLATION 2 4 STORAGE AND SHIPPING This instrument may be stored o...

Page 22: ... 2 2 voltage gently pry out fuse module with a flat blade screwdriver To use other fuse in module turn fuse module and reinsert into the line filter module 2 12 POWER CABLE WARNING BEFORE CONNECTING THIS INSTRUMENT the protective earth terminal of the instrument must be connected to the protective conductor of the Mains power cord The Mains plug must be inserted in a socket out let provided with a...

Page 23: ...a 8120 2857 Straight Shielded 791200 Coco Brown So Africa India Unpolarized in many nations OPT 125V 8120 1378 Straight NEMA5 15P 90 228 Jade Gray United States 903 8120 1521 90 90 228 Jade Gray Canada 8120 1992 Straight Medical 961244 Black Mexico eV 4 UL544 Philippines Taiwan OPT 250V 8120 0698 Straight NEMA6 15P 90 228 Black United States 904 Canada r a OPT 250V 8120 1396 CEE22 V1 30176 Jade Gr...

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Page 25: ...d 3 11 3 1 Introduction 3 1 3 2 Equipment Required 3 1 3 3 Test Record 3 1 3 4 Selftest Verification 3 1 3 5 Bandwidth Performance Test 3 2 3 6 Offset Accuracy Test 3 3 3 7 Trigger Sensitivity Test 3 5 3 8 Delta t Accuracy Test 3 8 3 9 Voltage Measurement Accuracy 3 10 ...

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Page 27: ... in this section the HP 54501A selftests may be performed The internal tests verify functions on the System Board Assembly of the HP 54501A The functions tested are the six separate memories and five other functions of the board To invoke the HP 54501A SELFTEST HP 54501A PERFORMANCE TESTS SECTION 3 PERFORMANCE TESTS MENU press front panel UTIL key and then select selftest menu softkey A message wi...

Page 28: ...tical sensitivity to 100 mV div 6 Adjust Signal Generator output for vertical deflection on HP 54501A of exactly 8 divisions Adjust offset as necessary 7 Set Power Meter CAL FACTOR for 100 kHz value from Power Sensor CAL FACTOR chart 8 Press Power Meter REF key to set 0 dB reference 9 Change Signal Generator frequency to 100 MHz 10 Select HP 54501A TIMEBASE and set at 10 nsec div Adjust trigger le...

Page 29: ... 075 div A C 5 mV range 2 of offset 0 4 X V div 0 15 div A C HP 54501A PERFORMANCE TESTS HP 436A POWER METER 54W W_23 Power Supply H P 6114A BNC 50 ohm Adapter f dual to banana plug m HP 1251 2277 3 3 1 Connect Power Supply to HP 54501A Channel 1 input 2 Adjust Power Supply for 1 V output 3 Press HP 54501A front panel CHAN key a Select channels 1 on b Select 100 mV div c Set coupling to dc d Set o...

Page 30: ... Press HP 54501A front panel display key a Select avg mode b Set of avg to 2048 9 Check for baseline within 0 6 divisions of center reference 10 Repeat steps 7 through 9 for channel 4 NOTE This performance test is temperature sensitive Test limits in steps 4 8 and 9 are with instrument operating at same temperature as when calibrated If temperatures are not the same the error will be increased by ...

Page 31: ... menu for 2048 averages a Press front panel DISPLAY key b Select avg with softkey c Enter 2048 with knob or ENTRY keys NOTE The display of the HP 54501A is improved by using averaging mode however the rate of display refresh is slowed con siderably because of the averaging process HP 54501A PERFORMANCE TESTS Signal Generator HP 8656B Type N Cable HP 11500B 3 Set Signal Generator for 10 MHz output ...

Page 32: ...SE for 10ns div a Press front panel TIMEBASE key b Select 10 ns div with knob or softkey 10 Slowly decrease Signal Generator output amplitude while adjusting HP 54501A trigger level for stable display 11 Stable triggering should be possible down to 2 divisions of vertical amplitude 12 Set HP 54501A vertical sensitivity to 200 mV div 13 Change Signal Generator output to 10 MHz and output amplitude ...

Page 33: ...ss front panel TIMEBASE key b Select 10 ns div with knob or ENTRY keys 19 Triggering should be stable down to 1 division of signal amplitude 20 Repeat steps 1 through 20 for Channel 4 21 Repeat steps 12 through 20 for Channels 2 and 3 HP 54501A PERFORMANCE TESTS 18 Slowly decrease Signal Generator amplitude while maintaining stable triggering on HP 54501 A ...

Page 34: ...t 3 Autoscale HP 54501 A by pressing front panel AUTOSCALE key 4 Adjust Signal Generator output level for 6 to 8 division vertical deflection on HP 54501A 5 Change TIMEBASE to 5 ns div 6 Set TIMEBASE delay for 0 00000 s 7 Go to DISPLAY menu and set of averages 2048 8 Select delta t menu by pressing At AV key 9 Select At markers on 10 Set start marker to mid screen crossover point on left side of d...

Page 35: ...NCE TESTS Figure 3 2 Delta t Accuracy Test Result 25 000 ns 0 00000 S 25 OOa s 5 00 ns div stop marker 20 300 n s start marker 19 700 ns delta t 40 000 ns I delta t 25 OOOOt1Hz aV markers on nt markers _ r start marker 1 t ...

Page 36: ...be as in table 3 1 5 Repeat steps 1 through 4 for Channel 4 6 Repeat steps 1 through 4 for Channels 2 and 3 on 500 mV 200 mV and 100 mV ranges Table 3 1 Voltage Measurement Accuracy Test Values and Results A D resolution changes from 0 4 to 0 8 on 5 mV range V div Setting Offset Setting Power Supply Tolerance Minimum V Maximum V 5 V 15 V 30 V 2 06 V 27 94 V 32 06V 2 V 6 V 12 V 824 mV 11 18 V 12 82...

Page 37: ...GER 5 mV 10 MHz 0 8 div SENSITIVITY 5 mV 50 MHz 2 div 200 mV 10 MHz 0 4 div 200 mV 50 MHz 1 div 3 8 DELTA T 40 nsec 1 3 nsec ACCURACY 38 7 to 41 3 nsec 3 9 VOLTAGE V div Offset Minimum CHI CH4 Maximum MEASUREMENT ACCURACY 5 V 15 V 27 94 V 32 06 V 2 V 6 V 11 18 V 12 82 V 1 V 3 V 5 58 V 6 41 V 500 mV 1 5 V 2 79 V 3 21 V 200 mV 600 mV 1 12 V 1 28 V 100 mV 300 mV 559 mV 641 mV 50 mV 150 mV 279 mV 321 ...

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Page 39: ...ustments 4 3 4 8 Focus Adjustment 4 5 4 9 Horizontal Phase Vertical Linearity and Height Adjustments 4 5 4 10 System Board Assembly Adjustments 4 6 4 11 Extender Cable Installation 4 6 4 12 Default Calibration Load 4 6 4 13 DAC Reference Adjustment 4 7 4 14 Track and Hold Offset Adjustments 4 9 4 15 Attenuator Compensation Adjustments 4 10 4 16 Pulse Response 4 11 4 17 Self Calibration 4 12 4 18 L...

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Page 41: ...een made to the System Board Assembly The self calibration routines execute automatic A D gain offset trigger and delay calibration and store the resulting factors to non volatile memory HP 54501A ADJUSTMENTS SECTION 4 ADJUSTMENTS Default values from system ROM are loaded to non volatile memory as a starting reference before beginning adjustments on the System Board Assembly When power is applied ...

Page 42: ...e positive lead of the voltmeter to 5 15V on the Power Supply Assembly 4 Connect the power cord to the HP 54501A and put power switch in ON position 5 Voltmeter should indicate voltage within the range of 5 150 V to 5 175 V and not to exceed upper limit of 5 2 V 6 If voltmeter reading is out of this range adjust 5 ADJ on Power Supply Assembly to 5 150 V 050 V 5 125 V to 5 175 V COM 12V 12V 12V 5 2...

Page 43: ...4501A CRT Test Display HP 54501A ADJUSTMENTS 1 Place CRT test menu on HP 54501A screen for the CRT Assembly adjustments via the UTILITY menu Use this test menu for all CRT adjustments a Invoke the UTILITY MENU by pressing the front panel UTIL key b By using the softkeys located vertically along the display select in sequence selftest menu mist and then crt test c Press start test to place crt test...

Page 44: ... BRIGHT control to the lowest setting of brightness where lower intensity blocks on menu are visible on the CRT screen 3 Turn rear panel INTENSITY to bring up the intensity level on screen Screen intensity should be at a comfortable viewing level and the position of adjustment should be close to three quarter range 4 Adjust CONT for the best contrast between low and high intensity blocks on menu e...

Page 45: ...eed to be repeated as necessary 3 Readjust steps 1 and 2 as necessary for a uniform display of the screen menu HP 54501A ADJUSTMENTS 2 Adjust sweep board FOCUS control for sharp percent symbol on the top and bottom blocks of text 1 Adjust sweep board V LIN for equal height of corner squares Square height should be ap proximately 25 mm 2 Adjust sweep board HEIGHT to give the screen menu top and bot...

Page 46: ... HP 54501A 6 Connect the Extender Cable from power supply to System Board Assembly 7 Reconnect line filter cable to power supply 8 Connect power cable and apply power 1 Invoke SERVICE MENU by first pressing front panel UTIL key and then selecting service menu 2 Select cal select 3 with menu softkey 3 Set rear panel CALIBRATION switch to UNPROTECTED position 4 Press start cal menu softkey A caution...

Page 47: ...adjust 4 Connect DVM to rear panel DC Calibrator Output HP 54501A ADJUSTMENTS 5 Adjust System Board Assembly R723 for DVM indication of 5 0000 V Refer to figure 4 4 for adjustment location 6 Set cal select to low view 7 Measure V1 to four decimal places 0 volts 8 Set dac output to high adjust 9 Adjust System Board Assembly R723 for DVM indication of 5 000V PLUS V1 from step 7 10 Select exit menu s...

Page 48: ...l Dill L tft Ism Lan Ltw inn LIM LIM EtIn LUO r etta a eew asta t1eTt PEW e Y C11 t aae t Mnisr LW I RUA za v m tt n LIM MID LMM VIL C305 C302 C202 C102 CHAN1 CHAN2 CHAN3 CHAN4 Figure 4 4 HP 54501A System Board Assembly Component Locator Digitally signed by http www aa4df co m C137 C37 C5 C2 n rTl TP2 T H 3 4 R74 LLLM 1 t R115 t tYY Fl 11 R191 R91 w 8 D R15 ...

Page 49: ... and 4 to 100 mV div d Offset for trace at center screen 2 Connect oscilloscope probe to System Board Assembly TP1 T H 1 2 Refer to figure 4 4 for location of testpoints 3 Adjust System Board Assembly R274 until the 10 MHz square wave of Channel 1 is at mini mum amplitude Do not adjust 8274 to the end range position 4 Connect oscilloscope probe to System Board Assembly TP2 T H 3 4 HP 54501A ADJUST...

Page 50: ...lat top and baseline on displayed signal 8 Connect Square Wave Generator to Channel 2 and increase output to approximately 1 V 9 AUTOSCALE and set channel 2 vertical sensitivity to 200 mV div 10 Adjust System Board Assembly R215 for flat top and baseline on displayed signal 11 Connect Square Wave Generator to Channel 3 12 AUTOSCALE and set channel 3 vertical sensitivity to 200 mV div 13 Adjust Sys...

Page 51: ... Connect Square Wave Generator output to Channel 1 AUTOSCALE 30 AUTOSCALE and set channel 1 vertical sensitivity to 2 V div 31 Adjust System Board Assembly C302 for flat top and baseline on displayed signal 4 16 Pulse Response Adjustments Equipment Required Pulse Generator Tektronix 284 50 Ohm Termination HP 101000 Procedure 4 Press TIMEBASE and set for 5 nsec div HP 54501A ADJUSTMENTS 1 Connect P...

Page 52: ...LF CAL MENU will be displayed 4 Select cal select 0 to perform the vertical self calibration NOTE Perform vertical calibration on all channels at one time with BNC tees and connectors or one at a time in the channel order of 1 4 2 then 3 5 Select start cal with menu softkey and messages will be displayed to complete calibration Vertical calibration takes approximately 7 minutes to complete 6 Conne...

Page 53: ...onnect BNC cable from rear panel AC Calibrator Output to channel 1 input 4 Select start cal menu softkey 5 Select continue 6 Adjust System Board Assembly C700 if is on either side of brackets in message at bottom of screen 7 When press continue 8 When logic trigger delay cal has been successfully completed PASSED message will be displayed 9 Switch rear panel CALIBRATION switch to PROTECTED positio...

Page 54: ...mpensation signal is 1 50588 kHz 3 Invoke SERVICE MENU by first pressing front panel UTIL key and then selecting service menu 4 Select cal select 1 with menu softkey 5 Select processor clock with menu softkey 6 Processor clock of 19 6608 MHz is at rear panel AC Calibrator output 7 Select timebase clk with menu softkey 8 Timebase clock of 10 1808 MHz is at rear panel AC Calibrator output ...

Page 55: ...ECTION 5 REPLACEABLE PARTS Table of Contents 5 1 Introduction 5 1 5 2 Abbreviations 5 1 5 3 Replaceable Parts 5 1 5 4 Exchange Assemblies 5 1 5 5 Ordering Information 5 1 5 6 Direct Mail Order System 5 1 ...

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Page 57: ...t code HP 54501A REPLACEABLE PARTS SECTION 5 REPLACEABLE PARTS 5 4 EXCHANGE ASSEMBLIES Some parts used in this instrument have been set up for an exchange program This program allows the customer to exchange his faulty assembly with one that has been repaired calibrated and performance verified by the factory The cost is significantly less than that of a new part The exchange parts have a part num...

Page 58: ...transportation there is a small handling charge for each order d No invoices 5 2 A3 In order for Hewlett Packard to provide these advantages a check or money order must ac company each order Mail order forms and specific ordering informa tion are available through your local Hewlett Packard office Addresses and telephone numbers are located at the back of this manual Figure 5 1 HP 54501A Exploded ...

Page 59: ...AR PANEL 28480 54503 00201 MP5 54503 61602 3 1 CONNECTOR HP IB 28480 54503 61602 MP6 5040 8823 2 1 KNOB GRAY INT REAR PANEL 28480 5040 8823 MP7 01650 46101 2 2 LOCKING PIN PC BOARD 28480 01650 46101 MPB 01650 04901 2 1 HANDLE BALE 28480 01650 04901 MP9 01650 47701 0 2 FOOT MOLDED 28480 01650 47701 MP10 1460 1345 5 2 TILT STAND 28ABO 1460 1345 MP11 54503 41901 3 1 KEYPAD ELASTOMERIC 28480 54503 419...

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Page 61: ... 6 13 Troubleshooting Flowcharts 6 9 6 14 Power Supply Voltages Check 6 16 6 15 CRT Monitor Signals Check 6 17 6 16 Keyboard Signals Check 6 19 6 17 Assembly Removal and Installation 6 21 6 18 Removal and Replacement of Rear Panel Assembly 6 22 6 19 Removal and Replacement of Power Supply Assembly 6 22 6 20 Removal and Replacement of Keyboard Assembly 6 23 6 21 Removal and Replacement of System Bo...

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Page 63: ...should be removed from the in strument 6 3 LOGIC CONVENTION Where logic levels are used in this manual certain conventions are used Logic states are defined as follows 0 False negated inactive or unas serted state True active or asserted state HP 54501A SERVICE SECTION 6 SERVICE Voltage levels representing logic states are as follows LOW L The more negative of two voltage levels HIGH H The more po...

Page 64: ...Intensity T W7 3 A and D represent analog CHI and digital voltages from Dashed line indicates the power supply Analog rear panel location voltages are routed mainly to data acquisition section of the system board r W5 KEYPAD J1 J951 AND I L 20 RPG r _____ r W4 HP IB J952 Connector L 24 System Control L _ _ _ _ _ J r _____ Data r W3 DC Acquisition J4 Calibrators L 2 Output L _ _ _ _ _ J r _____ l r...

Page 65: ... is adjustable The adjust ment procedure is in section 4 of this manual 6 6 Display Monitor Assembly 6 7 System Board Assembly HP 54501A SERVICE The Display Monitor Assembly consists of the sweep board circuitry a 9 inch green phos phor display CRT and the CRT yoke The as sembly requires 5 V and 12 V from the power supply via the System Board Assembly The CRT is a non interlacing raster display co...

Page 66: ... DC offset from the DAC is incorporated in the low frequency amplifier A variable resistor in the low frequency amplifier is provided for compensation adjustments for each channel The high and low frequency components of the signal are recombined and applied to the input FET of the preamplifier providing a high input impedance for the preamplifier The preamplifier changes the incoming signal into ...

Page 67: ...CH1 J13 CH3 J11 P 0 SYSTEM B0ARD ASSEMBLY Figure 6 2 HP 54501A Acquisition Block Diagram HP 54501A SERVICE CHANNELS SELECT TRIGGER LEVELS HYSTERESIS A D LEVELS GAIN CAL SIGNAL 6 5 ...

Page 68: ...r circuit that acts as a time interval stretcher to supply the trigger timing information to the timebase When the logic trigger receives a signal that meets the programmed triggering requirements it signals the timebase The timebase then sends a pulse to the fine interpolator The pulse is equal in width to the time between the trigger and the next sample clock The fine interpolator stretches this...

Page 69: ...on for the timing control logic TCL the dot rate for the display circuitry and a high frequency signal to data acquisition for the AC Calibrator Output signal on the rear panel Timing Control Logic TCL HP 54501 A SERVICE Timing Control Logic TCL is reponsible for providing timing and control for System Control of the HP 54501A The TCL circuitry consists of PALs program mable array logic various lo...

Page 70: ...RESET 20 MHz CLOCK DECODERS BEEPER CLICKER ADDRESS POWER SUPPLY ASSEMBLY INTERFACE CIRCUITS DISPLAY Figure 6 3 HP 54501A System Control Block Diagram J950 i J9511 KEYPAD RPG 4 4 I J952 ON HP IB 1 i DATA 1 TIMING i CON LOGIC TROL ACQUISITION I TCL I i i ...

Page 71: ...er circuit and an imbedded lithium energy source The smart socket monitors the supply voltage Vcc When Vcc falls below an acceptable voltage level such as during power down of the HP 54501A the internal lithium source is auto matically switched on and write protection is unconditionally enabled to prevent garbled data The non volatile static RAM stores menu configurations calibration factors and u...

Page 72: ...nnec ted through a tri state buffer to the 8 lower data lines The acquisition interface consists of 16 func tional lines 3 data latch controls 4 logic trig ger functions 2 DAC functions 3 timebase functions and four unused selects Other in terface circuitry is made up of buffers for ad dress and data lines and five latched data lines for control signals to the Timebase and Logic Trigger and the ca...

Page 73: ...nd tables to help isolate trouble Disassembly procedures are included at the end of this section to direct in replacing faulty modules The circled numbers on the first chart indicate the entry point of the next flowchart for isolating a problem wm roi PERFORM SELFTESTS PRESS UTIL KEY SELF TESTS TEST ALL CHART 0 Figure 6 4 General Trouble Isolation Flowchart for HP 54501A HP 54501A SERVICE END ...

Page 74: ...ICE FROM CHART 0 DISCONNECT POWER CHECK FUSE POSITION RATING AND OPERATION APPLY POWER AND CHECK POWER SUPPLY VOLTAGES TABLE 6 1 REPLACE FUSE CHART 1 a4eovrso Figure 6 5 Trouble Isolation Chart for HP 54501A Fan Fuse ...

Page 75: ...r FROM CHART 0 REMOVE SYSTEM BOARD ASSEMBLY CABLE W1 FROM POWER SUPPLY SEE PARA 6 14 CHART 2 Figure 6 6 Trouble Isolation Flowchart for HP 54501A Power Supply HP 54501A SERVICE 5450IMN ...

Page 76: ...FIP 54501A SERVICE FROM CHART 0 DISCONNECT SWEEP CABLE W1 FROM SWEEP BOARD CHART 3 Figure 6 7 Trouble Isolation Flowchart for HP 54501A CRT Monitor ...

Page 77: ...16 REPLACE SYSTEM BOARD ASSEMBLY A1 CHART 4 REPLACE CABLE END 54501 T Figure 6 8 Trouble Isolation Flowchart for HP 54501A Keyboard NOTE Keydown power up must be performed on HP 54501A before selftests are invoked This ensures critical parameters to the selftests are set and er roneous conditions will not result HP 54501A SERVICE ...

Page 78: ...HP 54501A SERVICE FROM CHART 0 CHART 5 Figure 6 9 Trouble Isolation Flowchart for HP 54501A Calibration Signals ...

Page 79: ...nnect cable W1 from power supply as in figure 6 10 1taro I ktiNRM This procedure is to be performed only by service trained personnel aware of the hazards involved such as fire and electrical shock c Load 5 15 V supply with resistor see Recommended Test Equipment in section 1 Use alligator clips to connect one end of the resistor to any pin 1 4 and the other end to any pin 5 8 d Connect power cabl...

Page 80: ...the supplies must be measured to the respective ground PIN SIGNAL PIN SIGNAL 1 5 15 V ANALOG 11 5 2 V ANALOG 2 5 15 V ANALOG 12 GROUND ANALOG 3 5 15 V DIGITAL 13 12 V ANALOG 4 5 15 V DIGITAL 14 GROUND ANALOG 5 GROUND DISPLAY 15 12 V ANALOG 6 GROUND DIGITAL 16 GROUND ANALOG 7 GROUND DIGITAL 17 12 V DISPLAY 8 GROUND ANALOG 18 5 2 V ANALOG 9 3 5 V ANALOG 19 15 5 V FAN 10 GROUND ANALOG 20 GROUND FAN ...

Page 81: ...e pins Table 6 3 is the truth table for these signals Table 6 2 CRT Monitor Assembly Cable Pin Assignments HP 54501A SERVICE PIN SIGNAL DESCRIPTION PIN SIGNAL DESCRIPTION 1 5 V DIGITAL 2 12 V DISPLAY 3 GROUND DISPLAY 4 GROUND DISPLAY 5 12 V DISPLAY 6 GROUND DISPLAY 7 12 V DISPLAY 8 GROUND DISPLAY 9 12 V DISPLAY 10 HSYNC 11 VSYNC 12 12 V DISPLAY 13 GROUND DIGITAL 14 GROUND DIGITAL 15 GROUND DISPLAY...

Page 82: ...HP 54501A SERVICE W6 Table 6 3 FB and HB Truth Table Figure 6 13 HP 54501A CRT Monitor Assembly Cable W6 Location FB HB Video Output 0 0 Off 0 1 Half bright 1 0 Full bright 1 1 Full bright ...

Page 83: ...d look for appropriate response on display 9 If display responds as if key were pressed replace elastomeric keypad h If display does not respond to short as if key were pressed replace keyboard 2 The row scan signal of 60 Hz is present at all times This signal is found on pins 14 through 20 of keyboard cable connector The same signal is on pins 3 and 9 through 13 only when a key is being pressed R...

Page 84: ... of Rear Panel Assembly 1 Disconnect power cable CAUTION Never remove or install any circuit board with the instrument power ON Component damage may occur 2 Remove the six screws from top and the two screws from each side of the instrument with TORXO 10 screwdriver 3 Lift top cover off 4 5 6 7 Detach line filter cable W7 from power supply Remove the eight screws from the rear panel with TORXe 15 s...

Page 85: ...d Replacement of Power Supply Assembly 3 Detach keyboard cable W5 from System Board Asser nbly HP 54501 A SERVICE 4 Remove the four screws securing Keyboard Assembly to front of instrument cabinet 5 The Keyboard Assembly label overlay housing keypad keyboard RPG and knob will come off front panel as one unit 6 To disassemble the Keyboard Assembly follow these steps a Pull RPG knob to remove Keyboa...

Page 86: ...upply Assembly by sliding out through side of instrument 8 Disconnect fan cable B1 W1 from System Board Assembly 9 Disconnect keyboard cable W5 and HP IB Cable W4 from System Board Assembly 10 Remove rear panel by removing the eight screws securing it to instrument and lifting off Refer to previous paragraph Removal and Installation of Rear Panel if necessary 11 Carefully place instrument in front...

Page 87: ...y itself even while disconnected Discharge the CRT before handling by shorting the post accelerator terminal of the CRT to the ground lug with a jumper lead 3 Disconnect post accelerator lead from CRT by firmly squeezing rubber cap until metal clip disengages from CRT 4 Detach intensity cable W7 from sweep board 5 Detach sweep cable W6 from sweep board and CRT Monitor Assembly cables from CRT and ...

Page 88: ...er to Removal and Installation of Rear Panel Assembly if necessary 5 Detach line filter cable W8 from power supply 6 Detach fan cable B1 W1 from System Board Assembly 7 Remove fan by removing the four screws securing it to cabinet 8 To install fan reverse this procedure When replacing fan be sure fan label is to outside of instrument to assure fan cable is directed toward center of rear panel for ...

Page 89: ... The tests may be run individually or by selecting test all softkey consecutively After each selftest has been completed a message of pass or fail for that selftest will be displayed If failed messages are displayed for components or circuitry on the System Board Assembly it may help to perform the adjustment procedures in section 4 of this manual If the selftests continue to fail the System Board...

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