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HP 85027A/B/C Adjustments

AC Adjustment Procedure

1.

Set up the equipment as shown in Figure 5-1. Turn on the analyzer, source and
power meter and allow 30 minutes for warm-up. Refer to Figure 5-2 for
locations of the adjustments.

2.

Connect the power meter sensor to the calibrated 10 dB step attenuator.

NOTE

If your attenuator does not have calibration data, determine
exactly how much the attenuation changes between the 0dB
and 30dB settings. Determine this with the source set for
about +13 dBm at 50 MHz CW. Use this figure when the
procedure refers to calibrated 30 dB; for example, 29.9 dB or

30.06 dB.

3.

Set the attenuator for 0 dB.

4.

Preset the analyzer. Set the source to generate 50 MHz CW without modulation.

Adjust the output for a reading of +6.5 dBm on the power meter and then turn on

the modulation.

Figure 5-2. Locations of A djustment Potentiometers

5-2

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Summary of Contents for 85027A

Page 1: ...OPERATING AND SERVICE MANUAL irector US P avy Cahbrat on Laboratory Box 16 US Naval Air Station FPO San Francisco 96654 2901 HP 85027A B C DIRECTIONAL BRIDGE 7 z bgI H EWLETT PACKARD é CI C to ...

Page 2: ...e reproduced documents must include the following legend and disclaimer Copyright Hewlett Packard Company HF Reproduced with HP permission Hewlett Packard makes no warranty of any 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...

Page 3: ...ng improvements made afterthe printing ofthe manual Two types ofinformation are included UPDATES APPLY TO ALL SERIAL NUMBERS NUMBERED CHANGES UPDATES THAT ARE SERIAL NUMBER PREFIX RELATED The information is in the followingorder UPDATES NUMBERED CHANGES in sequen tial order with applicable illustrations as close as possible to each numbered change To use this supplement make all UPDATES and all ap...

Page 4: ...r l0volts Directivity2 0 01 to 12 4 GHz 4OdB 40 dB 36 dB 12 4 to 18 0 Ghz 40 dB 40 dB 34 dB 18 Oto2O OGhz 4OdB 20 0to26 5GHz 36dB Test Port Match2 0 01 to 8 4 GHz 23dB 23dB 23dB 8 4to12 4GHz l9dB l5dB l9dB 12 4 to 18 0 GHz 15 dB 15 dB 15 dB 18 Oto2O OGhz l5dB 20 0 to 26 5 Ghz 11 dB it 50 MHz to 7dBm input to bridge 0 0 Ui E E S 3 2 I U Spe If Ice lons I 2 5 10 15 20 5 Deite Power dB 30 5 40 Measur...

Page 5: ...rst band of frequencies in the Performance Test Record 0 01 to 8 4 GHz 4 Perform an open short calibration and store it in memory 5 Connect the directional bridge under test to the first directional bridge test port to test port with an adapter if necessary Connect the 50 ohm load to the input port of the directional bridge under test 6 On the HP8757A turn on the cursor and pressthe MAX softkeyto ...

Page 6: ...uation the cursor indicates 6 0 1dBm DC Adjustment Procedure NOTE You can perform this DC procedure only with an HP 8757A analyzer 12 On the HP 8757A set DC mode 13 Set the reference level to 50 dBm at midscreen and the scale to 5 dB div 14 On the source turn off the RF power 15 On the analyzer press CAL CONFIGSYSTEM If your analyzer has firm ware revision 2 0 or above press CAL and select MORE AU...

Page 7: ...e calibrated 30 dB It may be necessary to adjust R5 and R29 until the difference between the 0 dB and 30 dB attenuator settings is just within 0 8 dB of the calibrated 30 dB Adjust R5 when the attenuator setting is 0 dB and R29 when at 30 dB 27 If any adjustments are made it will be necessary to repeat the AC Adjustment Procedure again only this time using a tolerance limit of 0 8 dB instead of th...

Page 8: ...HP 85027C Serial Prefix 2522A 2522A 2522A For additional information about serial numbers refer to INSTRUMENTS COVERED BY MANUAL in Section 1 and BACKDATING Section 7 Copyright HEwLETr PAcKARD COMPANY 1985 1400 FOUNTAINGROVE PARKWAY SANTA ROSA CA 95401 U S A MANUAL PART NUMBER 85027 90001 Microfiche Part Number 85027 90002 U Box i FF0 San FI r C Printed JULY 1985 4 HEWLETT F PACKARD ...

Page 9: ...4 HP8341A 1 4 Detectors 1 4 Power Splitters 1 4 Equipment Available 1 4 Accessories Available 1 4 Recommended Test Equipment 1 5 Warranty Restrictions 1 5 2 INSTALLATION 2 1 Introduction 2 1 Initial Inspection 2 1 Preparation for Use 2 2 Power Requirements 2 2 Connecting the HP 85027 2 2 Mating Connectors 2 2 Operating Environment 2 3 Storage and Shipment 2 3 Environment 2 3 Packaging 2 3 3 OPERAT...

Page 10: ... 4 6 REPLACEABLE PARTS 6 1 Introduction 6 1 Exchange Assemblies 6 1 Replaceable Parts List 6 1 Organization 6 1 Information 6 1 Ordering Information 6 2 7 MANUAL BACKDATING CHANGES 7 1 Introduction 7 1 Application 7 1 8 SERVICE 8 1 Introduction 8 1 Theory of Operation 8 I Troubleshooting Procedures 8 2 Gaining Internal Access 8 2 Cable Continuity Check 8 2 Power Cable Replacement 8 3 Input Port an...

Page 11: ... 5 1 Adjustment Setup 5 1 5 2 Locations of Adjustment Potentiometers 5 2 6 lA HP 85027A Replaceable Parts Identification 6 5 6 1B HP 85027B Replaceable Parts identification 6 7 6 lC HP 85027C Replaceable Parts Identification 6 9 6 2 A2 Circuit Board Component Location Component Side 6 1 1 6 3 A2 Circuit Board Component Location Solder Side 6 1 1 8 1 A2 Circuit Board Power Supply Check Points 8 5 8...

Page 12: ...rmance Test Record 4 6 4 2 Test Port Match Performance Test Record 4 8 4 3 Dynamic Power Accuracy Performance Test Record 4 10 6 1 Exchange Microcircuit Bridge Assemblies 6 2 6 2 Manufacturers Code List Reference Designators and Abbreviations 6 2 6 3A HP 85027A Replaceable Parts 6 4 6 3B HP 85027B Replaceable Parts 6 6 6 3C HP 85027C Replaceable Parts 6 8 6 4 A2 Circuit Board Assembly Replaceable ...

Page 13: ...HP 85027A B C General Information Figure 1 1 1 IP 85027B in Accessory Case Supplied 1 0 ...

Page 14: ...ds or limits against which the bridges may be tested Table 1 2 lists supplemental characteristics non warranted but typical performance parameters useful in test applications SAFETY CONSIDERATIONS The voltages in these directional bridges do not warrant more than normal caution for operator safety CAUTION The CAUTION sign in this manual identifies an operating procedure or practice which if not co...

Page 15: ...HP 85027A B C General Information Figure 1 2 LIP 85027A 85027B arid 85027C Directional Bridges 1 2 ...

Page 16: ...rporation EQUIPMENT REQUIRED BUT NOT SUPPLIED The following equipment is required for use with the HP 85027 in making reflection transmission and ratio measurements Scalar Network Analyzer The frequency range of the three following analyzers is determined by the HP 85027 directional bridge in use HP 8757 A this scalar network analyzer is a microprocessor based four channel three input four with Op...

Page 17: ...mmable and can be controlled by the HP 8757A It does not require a plug in as it is a complete analog sweep synthesizer It generates synthesized output frequencies from 0 01 to 26 5 GHz The HP 8340A can be square wave modulated at 27 8 kHz by the HP 8757A HP 8341A this synthesized sweeper differs from the HP 8340A above in frequency range 0 01 to 20 0 GHz Detectors One or more HP 85025A B detector...

Page 18: ...s specifications meet or exceed the specificat ions listed in the Critical Specifications column WARRANTY RESTRICTIONS Performing any disassembly or repair procedure not included in Section 8 Service of this manual will void the warranty Subjecting a HP 85027 bridge to RF input power levels in excess of 23 dBm or 10 volts will likewise void the warranty Connector damage caused by mating with out o...

Page 19: ...10 volts 23 dB or l0 volts 23 dB or 10 volts Directivity2 0 01 to 12 4 GHz 12 4 to 18 0 GHz 18 0 to 20 0 GHz 20 0 to 26 5 GHz 40 dB 40 dB 40 dB 40 dB 40 dB 36 dB 36 dB 34 dB Test Port Match2 0 01 to 8 4 0Hz 8 4 to 12 4 GHz 12 4 to 18 0 GHz 18 0 to 20 0 GHz 20 0 to 26 5 GHz 23 dB 19 dB l7 dB 23 dB l5 dB 15 dB 15 dB 1 I dB 23 dB 19 dB 17 dB 5 cv Delta Power dB Measu red Re I at i ye 25 C 5C at 50 MH...

Page 20: ...formation Dimensions cable length 26 mm high x 124 mm wide x 118 mm deep 1 0 x 4 9 x 4 4 1219 mm 48 Weight net 0 5 kg 12 lb shipping 2 3 kg 5 lb 1 Unless otherwise noted all specifications apply from 0 Cto 55 C 2 25 C 5 C 1 7 ...

Page 21: ...te verlYPic l H 2 4 8 18 20 26 5 35 30 25 20 01 12 Frequency 0Hz HP 85027A HP 85027B HP85027A HP85027B HP85027C Typical Insertion Loss at 0 01 0Hz 6 5 dB 6 5 dB 6 5 dB at 18 0 0Hz 8 0 dB 8 0 dB 8 0 dB at 26 5 0Hz 10 0 dB Typical lnput Port Match 0 01 to 8 4 0Hz 20 dB 20 dB 20 dB 8 4 to 18 0 0Hz 15 dB 15 dB 15 dB 18 0 to 26 5 GHz 10 dB Typical Mm Input Power for a 40 dB Return Loss at 18 GHz HP 875...

Page 22: ...se 9211 1582 1 operating note 85023 90003 HP 85023C Type N for use with HP 85027C Qty Accessory HP Part or Model No 1 Type N short 1151 2A I Type N open 85032 60001 1 N m to N m adapter 1250 1475 I Type N 50 ohm termination 909A opt 012 I Type N 10 dB pad 8491B opt 010 I instrument case 9211 1582 1 operating note 85023 90005 Table 1 4 Accessories Available ADAPTERS CONNECTOR SAVERS Connector 3 Smn...

Page 23: ...B or 83595A 83595A or 83595A 8495D opt 004 8341 A 85025A 11667A 85027 AC DC compatible 8757A 8757A 8757A 8757A compatible Frequency 0 01 Frequency 0 01 Frequency 0 01 Frequency 0 01 to 18 0Hz to 26 5 0Hz to 20 0Hz to 26 5 0Hz 8341A Frequency 0 01 to 18 0Hz 85025A Frequency 0 01 to 26 5 0Hz Frequency 0 01 Frequency 0 01 to 18 0Hz to 26 5 0Hz 1l667A Frequency 0 01 to 26 5 0Hz 436A Frequency 0 01 to ...

Page 24: ...Type N m Type N m 3 5mm 3 5mm m 3 Smm m m 3 Smm f Type N m Type N m Open short 7mm open short 3 5mm open short Type N Type N open short Wrench no yes no Read and observe these cautions save yourself time and trouble CAUTION Use caution when mating an SMA male connector to the precision 3 5mm female connectors on the HP 85027B Push the connectors straight together with the male contact concentric w...

Page 25: ...ARATION FOR USE Power Reqniremnents Power for the HP 85027 is supplied by the network analyzer Connecting the HP 85027 Insert the connector of the bridge s power cable Wl into the A B C if HP 8757A Option 001 or R mating connector of the analyzer and turn the outer sleeve clockwise to tighten it Connect the HP 85027 s input port to the RF output port of the source Connect the device under test to ...

Page 26: ... are available through Hewlett Packard offices Alternatively comparable packaging materials may be used in any case please observe the following guidelines a Wrap the bridge in heavy paper or anti static plastic If shipping to a HP Office or Service Center complete and attach a service tag HP P N 9320 3896 see Section 6 of this manual or another system component manual b Use sufficient shock absor...

Page 27: ...nnector saver on the test port whenever some loss in directivity can be tolerated Refer to Table 1 2 to see the minimal performance loss incurred by using HP s high quality adapters and connector savers For measuring SMA devices from 10 MHz to 18 0Hz HP recommends using the HP 85027A with an APC 7 to 3 5mm adapter For measuring SMA devices to 26 5 0Hz HP recommends using the HP 85027B with one of ...

Page 28: ...8756A or 8755C with the HP 85027 set the bridge configuration switch to HP8756 HP8755 and refer to that analyzer s manual for the corresponding setups Figure 3 5 shows a typical measurement setup using a power splitter Figure 3 1 HP 85027B i ith Connector Saver 3 2 ...

Page 29: ...ns and feeds to the analyzer data on the signal reflected by the DUT 4 Configuration switch Si This switch sets the bridge for use with either the HP 8757A or HP 8756A 8755C 5 Test port connector J2 3 5 mm Connect the DUT calibration short or open here 6 Input connector JI 3 5 mm Apply the RF signal here 7 Test port connector J2 Type N Connect the DUT calibration short or open here 8 Input connect...

Page 30: ...e 3 3 Typical Operator s Check using HP 8757A Bridge Analyzer Sweep oscillator RF plug in Calibrated open Calibrated short 10 dB pad HP 85027A HP 8757A HP 8350B HP 83592A 85021 60001 85021 60001 8492A Opt 010 HP 85027B HP 8757A HP 8350B HP 83595A 85037 60001 85037 60001 8493C Opt 010 HP 85027C HP 8757A HP 835013 HP 83592A 85032 60001 115 l2A 8491B Opt 010 ONLY REQUIRED F HP 83508 HAS SERIAL PREFIX...

Page 31: ...on the cursor 6 With nothing connected to the test port of the bridge set the RF plug in to indi cate a CRSR value of 0 0 dB on the CRT 7 Connect the 10 dB pad to the test port of the bridge 8 The CRSR value should now be 20 0 2 0 dB 9 To check the DC performance of the bridge perform steps 1 through 4 Then select MODE DC and perform a manual DC ZERO Continue with steps 5 through 9 The final resul...

Page 32: ...gure 3 4 Typical Measurement Setup using LIP 8757A ONLY REQUIRED IF HP B3SOB HAS SERIAL PREFIX 2436 OR BELOW POS 2 BLANK POS 2 BLANK ONLY REOUIRED IF HP 8350B HAS SERIAL PREFIX 2436 OR BELOW Figure 3 5 Typical Measurement Setup using Power Splitter 3 6 ...

Page 33: ...specifications and their acceptable limits Test results recorded during incoming inspection can be used for comparison with test results obtained after periodic maintenance troubleshooting repairs or adjustments DIRECTIVITY Description Directivity is a measure of the ability of a directive device in this case the HP 85027 to discriminate between incident and reflected signals In principle directiv...

Page 34: ... 905A 909C opt 012 Procedure This test must be performed between 20 C and 30 C to be valid 1 Connect the equipment as shown in Figure 4 1 Do not connect anything to the bridge test port 2 On the HP 8757A press PRESET to configure the system The HP 8757A PRESET will also I set the sweep time and turn on the modulation of the sweep oscillator and 2 turn on the RF output and set the power level of th...

Page 35: ...tivity measurements 30 6 31 1 31 7 32 4 33 2 34 0 34 9 35 9 37 1 38 4 40 0 41 9 44 4 48 0 54 0 aD 030 028 026 024 022 020 018 016 014 012 010 008 006 004 002 0 Figure 4 2 Probable Range of Measurable Directivity Values 6 Refer to Figure 4 2 The shaded ai eas in this figure represent the probable range of measureable values for each of the three specified directivity values 34 dB 36 dB and 40 dB On...

Page 36: ...frequencies on the display note the maximum and minimum measured return loss for various sliding load positions 11 For each frequency the maximum and minimum measured return loss values correspond to the directivity signal and the sliding load signal adding and subtracting You can separate these two signals with the Signal Separation Chart Figure 4 3 Calculate the difference in dB between the maxi...

Page 37: ...irst measurement is the directivity of the HP 85027 14 Enter the directivity on the Directivity Performance Test Record Table 4 1 15 Although the signal separation procedure removes reflections of the load itself the mismatch of the sliding load connector and airline introduces reflections and uncertainties To estimate these uncertainties refer to Figure 4 2 Locate the specified return loss of the...

Page 38: ...rformance Tests Table 4 1 Direc1ivit Performance Test Record Frequency Band 0Hz HP 85027 Scalar Sum of Directivity Signals 0 01 2 0 2 0 12 4 12 4 18 0 I8 0 20 0 20 0 26 5 Upper Limit from Figure 4 2 HP 85027B only 4 6 ...

Page 39: ...rformance Test Record below Description Using a typical reflection measurement setup as shown in Figure 4 4 a second directional bi idge is used to measure the TEST PORT of the bridge under test The bridge under test must be biased by the HP 8757A and its RF IN PORT must be properly terminated Figure 4 4 Test Port Match Performance Test Setup 4 7 ...

Page 40: ...d to the first band of frequencies in the Performance Test Record 0 01 to 8 4 GHz 4 Perform an open short calibration and store it in memory 5 Connect the directional bridge under test to the first directional bridge test port to test port with an adapter if necessary Connect the 50 ohm load to the input port of the directional bridge under test 6 On the HP 8757A turn on the cursor and press the M...

Page 41: ... Equipment in Figure 4 5 to measure the dynamic power accuracy of the HP 85027A HP 85027B HP85027C Sweep Oscillator RF Plug in Scalar network analyzer Short open Adapter s Step attenuator HP 835011 HP 83592A HP 8757A 85021 60001 1250 1475 8495B opt 001 HP 835011 HP 83595A HP 8757A 85037 60001 85027 60002 8495D opt 004 HP 835011 HP 83592A HP 8757A 1 1512A 85033 60001 1250 1475 8495B opt 001 r 1 I I...

Page 42: ...attenuate 10 dB To overcome this error refer to the attenuator s calibration data and use the actual attenuation value for each setting 7 If after removing the source of cr1 or from the test results as noted above you believe that the bridge still does not meet its specifications refer to Section 8 Troubleshooting 8 If you are using an HP 8757A with the bridge and wish to test its DC dynamic power...

Page 43: ...owing adjustments to match the preamplifier to the characteristics of the microcircuit Additionally if the HP 85027 does not pass one of its performance tests you may need to perform the adjustments in this section ADJ USTMENT PROCEDURES P05 Z BLANK Figure 5 1 A djustment Setup Note to perform the following adjustments refer to Figure 5 2 for the locations of the adjustment potentiometers P05 Z BL...

Page 44: ...s not have calibration data determine exactly how much the attenuation changes between the 0dB and 30dB settings Determine this with the source set for about 13 dBm at 50 MHz CW Use this figure when the procedure refers to calibrated 30 dB for example 29 9 dB or 30 06 dB 3 Set the attenuator for 0 dB 4 Preset the analyzer Set the source to generate 50 MHz CW without modulation Adjust the output fo...

Page 45: ...hrough 10 until the change in level is equal to the calibrated 30 dB 0 1dB and the cursor with 0 dB attenuation indicates 6 0 ldBm DC Adjustment Procedure NOTE This DC procedure can be performed only with an HP 8757A analyzer 12 Set the HP 8757A to DC mode 13 Set the analyzer s reference level to 50 dBm at midscreen with a scale of 5 dB division 14 Turn off the RF power from the source 15 Configur...

Page 46: ...ve the test port open 26 On the analyzem confirm that smoothing 5 default factor averaging 8 default factor and the cursor ai e on 27 ONLY if the cursor does not indicate 6 0 8dBm adjust the bridge s gain potentiometer R5 for a cursor reading of 0 0 8dB 28 Set the attenuator for 30 dB Only if the cursor does not indicate calibrated 30 minus 6 0 8dBm adjust the bridge s load potentiometer R29 for t...

Page 47: ...e placeable parts EXCHANGE ASSEMBLIES You may replace on an exchange basis the bridge microcircuit assembly and realize a considerable cost saving This assembly includes the input and test port connectors and the reference termination Table 6 i lists these factory repaired and tested assemblies and theii HP part numbers The defective assemblies must be returned for credit to m ealizethe cost savin...

Page 48: ...ice Table 6 1 Exchange Microcircuit Bridge Assemblies BRIDGE NEW PART EXCHANGE REBUILT NUMBER PART NUMBER HP 85027A 5086 7376 5086 6376 HP 85027B 5086 7377 5086 6377 HP 85027C 5086 7399 5086 6399 Table 6 2 Manufacturers Code List Reference Designators and A bbreviations MANUFACTURERS CODE LIST Code Manufacturer Address Zip Code 04713 Motorola Semiconductor Products Phoenix AZ 85008 06383 Panduit C...

Page 49: ... PF PRCN RGLTR RMS SGL SI SIG SLDR STR TA root mean square signal silicon signal solder double camfered hex fixed giga 1O 1000 milli amp million 106 manufacturer megahertz picofarad straight tantalum thread terminal trimmer precision THD TML TRMR TRN UF VDC W ZNR regulator turn microfarad volts direct current watt zener 6 3 ...

Page 50: ... RF CONNECTOR APC 7 COUPLING CONTACT RF CONNECTOR APC 7 SERIES DRESS COVER CABLE COVER EXTRUDED HOUSING PORT COVER NUTM DBLHX LOCKWASHER M3 0 TML STUD SGL PIN SCREW THD RLG M3 X 0 5 1OMM LG MACHINED PART SST SPACER BRIDGE SCREW MACH M2 X 0 4 5MM LG 90 DEG FLH HD SCREW MACH M2 X 0 4 5MM LG 90 DEG FLH HD ID LABEL 85027A CABLE TIE 062 625 DIA 091 WD NYL INSTRUMENT CASE FOAM PAD NOT ASSIGNED CARTON CO...

Page 51: ... parts listed are replaceable Any attempt to perform any disassembly or repair procedure not specifically outlined in Section 8 of this manual will void the warranty Damaged con nectors can be repaired or replaced only by Hewlett Packard Figure 6 lA HP 85027A Replaceable Parts Identification 6 5 MP1 MP6 MP18 FOUR TIMES REMOVED NOT VISIBLE TO SHOW INTERIOR ...

Page 52: ...COVER CABLE COVER EXTRUDED HOUSING PORT COVER NUTM DBLHX WRENCH CONNECTOR SAVER TERMINAL SLDR LUG PL MTG FOR 2 SCR SCREW THD RLG M3 X 0 5 8MM LG MACHINED PART SST SPACER BRIDGE SCREW MACH M2 X 0 4 5MM LG 90 DEG FLH HD SCREW MACH 3 0 X 8MM PN PD ID LABEL 85027B FOAM PAD INSTRUMENT CASE LOCK WASHER M3 0 LABEL ID 85027B CARTON CORR RSC ll 5 IN LG 8 625 IN WD LABEL IN RF IN TEST LABEL WARNING MAXIMUM ...

Page 53: ... disassembly or repair procedure not specifically outlined in Section 8 of this mnanual will void the warranty Damaged con nectors can be repaired or replaced only by Hewlett Packard Figure 6 lB HP 85027B Replaceable Parts Identification 6 7 M18 NOT VISIBLE BACK SIDE _ Al MP9 NOT VISIBLE J2 M4 A2 FOUR TIMES MP1 9 NOT VISIBLE ON SIDE ...

Page 54: ...R CABLE COVER EXTRUDED HOUSING PORT COVER NUTM DBLHX NOT ASSIGNED NOT ASSIGNED SCREW THD RLG M3 X 0 5 1OMM LG MACHINED PART SST SPACER BRIDGE SCREW MACH M2 X 0 4 5MM LG 90 DEG FLH HD SCREW MACH 3 0 X 8MM PN PD ID LABEL 85027C CABLE TIE 062 625 DIA 091 WD NYL CASE ACCESS BIRCH 9 71IN LG 6 76IN WD FOAM PAD LABEL ID 85027C INSTRUMENT CASE LABEL IN RF IN TEST LABEL WARNING MAXIMUM INPUT LOCKWASHER M 3...

Page 55: ...d in Section 8 of this manual will void the warranty Damaged con nectors can be repaired or replaced only by Hewlett Packard Figure 6 iC HP 8502 7C Replaceable Parts Identification HP 85027A B C Replaceable Parts Al MP9 NOT VISIBLE MP1O NOT VISIBLE Ml8 NOT VISIBLE BACK SIDE M4 NOT VISIBLE M19 ON SIDE M8 FOUR TIMES NOT VISIBLE 6 9 ...

Page 56: ... F TCO s lOO RESISTOR TRMR 2K 10 C TOP ADJ 1 7 TRN RESISTOR 100 1 05W F TCO 100 RESISTOR 100 lOb 05W F TCO lOO RESISTOR 100 1 05W F TCO lOO RESISTOR 75K iSo 05W F TC 0 100 RESISTOR TRMR 100K 10 CTOP ADJ 1 7 TRN RESISTOR 100 1 05W F TC O i lOO RESISTOR 100 l o 05W F TCO lOO RESISTOR 147K 1 05W F TCO 100 RESISTOR 1K 10 s 05W F TCO 100 RESISTOR 5 11K lOb 05W F TC 0 100 RESISTOR 100 10 o 05W F TC Oo l...

Page 57: ...HP 85027A B C Replaceable Parts Figure 6 2 A 2 Circuit Board Component Location Component Side Figure 6 3 A 2 Circuit Board Component Location Solder Side 6 il ...

Page 58: ...instruments with serial number prefixes on the title page There are no earlier versions of the instrument with lower serial number prefixes To adapt this manual to a later version higher serial number prefix instrument refer to a Manual Changes Supplement The supplement is keyed to this manual s print date and part number on the title page and is available free from Hewlett Packard Additional info...

Page 59: ...l Access Cable Continuity Check Power Cable Replacement Input Port and Test Port Resistance Checks A2 Circuit Board Assembly Replacement Microcircuit Check Al Bridge Microcircuit Assembly Replacement Power Supply Check Signal Path Check Clock Control Check Connector Inspection HP 85027A APC 7 Connector Repair THEORY OF OPERATION The HP 85027 can detect RF or microwave signals which are either 27 8...

Page 60: ...ou make a measurement ground the leads of the digital multimeter by touching them to the grounded instrument chassis Gaining Internal Access To obtain access to the interior of the HP 85027 proceed as follows I Disconnect the bridge from the analyzer 2 With the HP 85027A only use a thin 1 2 inch open end wrench to remove the coupling nut from the APC 7 test port connector 3 Remove the two screws w...

Page 61: ...e analyzer Momentarily ground the leads of the DMM by touching them to its grounded chassis CAUTION WORK STATIC FREE ESD can damage the highly sensitive microcircuits in the HP 85027 bridges 2 Measure the resistance from the center contact of input port connector Ji to the center contact of test port connector J2 The resistance should be 33 2ohms 3 Measure the resistance from the center contact of...

Page 62: ...the standoffs 4 Reverse the above procedure to install the repaired or replacement board 5 Refer to Section 5 Adjustments and perform them as indicated to match the A2 board to the Al microcircuit 6 Reassembly the remaining parts of the bridge Al Bridge Microcircuit Assembly Replacement 1 Type the serial number of the HP 85027 on the rear panel label supplied with the new or replacement bridge ass...

Page 63: ...tch the microcircuit to the preamplifier and pass the performance tests 12 Attach the new label to the bridge housing Power Supply Check 1 Connect the power cord of the bridge Wi to the analyzer and turn on the analyzer 2 Refer to Figure 8 i and check the power supply voltages of 15 12 6 8 and 5 volts at the 4 pads indicated Since the 1SV and 12 6V are supplied by the analyzer those voltages are s...

Page 64: ...on or in use doesn t feel right don t use it Visual Inspection Inspect connectors with an illuminated 4 power magnifying glass The lighting is crucial the exact power is not Normal room lighting especially oblique desk lamp lighting casts shadows The shadows can mask the small defects you are trying to expose Magnifying glasses with integral lighting provide shadowless axial illumination They are ...

Page 65: ...FREE CLOTH AROUND A SLENDER WOODEN ROD SUCH AS A TOOTHPICK FOR CLEANING AREAS THAT ARE TOO SMALL FOR THE SWABS WRONG CORRECT Figure 8 3 Cleaning A PC 7 Connectors 8 8 CIRCULAR STROKES LEAVE TORN FIBERS SNAGGED ON EDGES OF CENTER COLLET RADIAL STROKES DO NOT LEAVE F I BE RS USE CIRCULAR STROKES FOR OUTER CONDUCTOR FACE ONLY ...

Page 66: ...r attached to it by buckling the female contact fingers This danrnge and the resultant electrical interference is often noticeable as a power hole of several dB at about 22 0Hz Any center conductor which is recessed too far 0 003 in behind the outer conductor mating plane will cause poor electrical contact and high reflections Before using the connector gage to measure the connector visually inspe...

Page 67: ...time as shown in Section 8 Also take care with initial alignment push the two connectors straight together without overtightening or rotating either center conductor Use a torque wrench HP part number 87 10 1582 for the final connection This torque 5 lb in 60 N cm is less than is used when mating 3 5mm connectors together Use connector savers for an extra margin of safety 2 Important structural an...

Page 68: ...EC TORS HAS CIRCULAR BUSHING AROUND GAGE PLUNGER USE PROTRUDING END OF GAGE CALIBRATION BLOCK TO ZERO MALE CONNECTOR GAGE SCALE DIVISIONS 000025 IN EXAMPLE READING IS 0 00425 THIS INDICATES RECESSION OF THE CENTER CONDUCTOR OF 0 00425 Figure 8 5 Precision 3 5mm in Connector Gage 8 il ...

Page 69: ...Zeroing Precision 3 5mm m Connector Gage GRADUATED DIAL GRASP THE GAGE HERE FOR MAXIMUM STABILITY CAREFULLY ALIGN CIRCULAR BUSH ING AND PROTRUDING END THEN FIRMLY SEAT GAGE CALIBRATION BLOCK IF GAGE POINTER DOES NOT LINE UP WITH ZERO MARK LOOSEN THE DIAL LOCK SCREW AND ROTATE GRAD UATED DIAL UNTIL GAGE POINTER IS ALIGNED WITH ZERO THEN RE TIGHTEN THE DIAL LOCK SCREW DIAL LOCK SCREW 8 12 ...

Page 70: ...D GAGE PLUNGER WILL COME TO REST ON OUTER CONDUCTOR MATING PLANE ALLOWABLE RANGE PROTRUSION 0 000 in RECESSION 0 003 in Figure 8 7 Gaging Precision 3 5mm m Connector OUTER CONDUCTOR MATING PLANE BUSHING GRASP THE GAGE HERE FOR MAXIMUM STABILITY OUTER CONDUCTOR MATING PLANE INSERT GAGE 8 13 ...

Page 71: ...er conductor is a very thin tube which holds the center collet The center conductor must recede from the plane of the outer conductor The center conductor is rigid and serves only to hold the center collet in place It is the center collet which must protrude to make contact Note that the center collet is spring loaded and thus can retract without damage when mated Refer to Figures 8 8 8 9 and 8 10...

Page 72: ... OF CENTER CONDUCTOR IS 0 0235 INCH DIAL LOCK SCREW RELEASE SCREW TO ROTATE DIAL WHEN ZEROING GAGE GRASP THE GAGE HERE FOR MAXIMUM STABILITY FLAT MEASURING SURFACE USE THIS TO MEASURE CONNECTORS THAT HAVE CENTER COLLET IN PLACE PLUNGER CALIBRATION BLOCK USE RECESSED END WHEN USING ALIGNING PIN USE FLAT END WHEN ALIGNING PIN IS NOT USED CAP DO NOT USE AS A HANDLE SCALE DIVISIONS 0 0001 INCH Figure ...

Page 73: ...N POINTER IS NOTALIGNED WITH ZERO LOOSEN DIAL LOCK SCREW ROTATE DIAL UNTIL POINTER AND ZERO ARE ALIGNED THEN TIGHTEN THE LOCK SCREW IF THE RANGE POINTER IS NOT ALIGNED WITH ZERO THE GAGE MUST BE REPAIRED DIAL LOCK SCREW CALIBRATION BLOCK DO NOT HOLD THE GAGE HERE BECAUSE THE GAGE TENDS TO WOBBLE USE THIS END WHEN THE ALIGNMENT PIN IS USED Figure 8 9 Zeroing the APC 7 Gage 8 16 ...

Page 74: ... 010 INCH 0 05 0 25mm ALLOWABLE RANGE ALL CONNECTORS 0 002 INCH TO 0 010 INCH OUTER CONDUCTOR PLANE OF OUTER CONDUCTOR CENTER COLLET PROTRUSION 0 002 TO 0 010 INCH CENTER CONDUCTOR RECESSION 0 002 TO 0 008 INCH Figure 8 10 Gaging A PC 7 Connectors 8 17 PLANE OF OUTER CONDUCTOR PROTRUSION OF CENTER COLLET 0 002 0 010 INCH DO NOT USE ALIGNING PIN ...

Page 75: ...5027A B C Service PUSH LIGHTLY TO SNAP INTO PLACE REMOVING OLD COLLET REPLACING OLD COLLET OR INSERTING NEW COLLET FORCEPS BLUNT PLASTIC ROD Figure 8 11 Collet Removal and Replacement APC 7 Connectors 8 18 ...

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