Keysight 1143A User'S And Service Manual Download Page 19 | Manualshive

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Introduction

This chapter provides service information for the 1143A Probe Offset
Control and Power Module. The following topics are included in this
chapter:

•

Specifications and Characteristics

•

Recommended Test Equipment

•

Repair Strategy

•

Returning to Agilent Technologies for Service

•

Testing Performance

•

Making Adjustments

•

Troubleshooting

•

Replacing Parts

•

Theory of Operation

•

Schematics

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Summary of Contents for 1143A

Page 1: ...User and Service Guide Publication number 01143 97000 First edition June 2000 1143A Probe Offset Control and Power Module ...

Page 2: ...for full characteristics Power and control for two probes 17 3 Vdc and 17 3 Vdc at 300 mA each Offset current source of 5 mA for each probe Remote input for offset control Accessories Supplied The following accessories are supplied Power cable User and Service Guide Accessories Available The following accessories can be ordered 01143 61602 1 5 meter 59 inch probe power extension cable Order with t...

Page 3: ...Service Strategy The service strategy for the 1143A Probe Offset Control and Power Module is for field repair to the component level See chapter 2 Service for further information 3 ...

Page 4: ... Power Module It is divided into two chapters Chapter 1 shows you how to set up and operate the instrument both locally and remote Chapter 2 provides service information Included is how to test the supply performance how and when to make adjustments and how to troubleshoot and repair the instrument 4 ...

Page 5: ... Operating Characteristics 20 General Characteristics 21 Recommended Test Equipment 23 Service Strategy 23 To clean the instrument 23 To return the instrument to HP for service 24 Testing Performance 25 Test Interval 25 Equipment Required 25 To test output voltages 26 Making Adjustments 27 Safety 27 Adjustment Interval 27 Equipment Required 27 To prepare the equipment 29 To adjust power supply vol...

Page 6: ...ing and Repair 32 To troubleshoot the power supplies 32 To troubleshoot the offset circuitry 33 To disassemble the instrument 34 Replaceable Parts 35 Theory of Operation 44 Schematic Diagrams 47 Index 53 Contents 6 ...

Page 7: ... To inspect the power module 9 To check power requirements 11 To set the line voltage selection 11 To set up the power module 12 To use local offset 13 Remote Offset Input 14 Operating the Power Module 7 ...

Page 8: ...8 ...

Page 9: ... and the instrument has been checked mechanically and electrically Check the accessories Accessories supplied are listed in the introduction of this manual page 2 If the contents are incomplete or damaged notify your Agilent Technologies sales office Inspect the instrument If there is mechanical damage or defect or if the instrument does not operate properly or pass performance tests notify your A...

Page 10: ...Figure 1 1143A Probe Offset Control and Power Module Front Panel Figure 2 1143A Probe Offset Control and Power Module Rear Panel Operating the Power Module To inspect the power module 10 ...

Page 11: ...regardless of input voltage selection W AR NI NG SHOCK HAZARD BEFORE YOU CONNECT THIS INSTRUMENT TO MAINS POWER OR LIVE MEASURING CIRCUITS you must provide a protective earth ground The Mains plug must be inserted in a socket outlet provided with a protective earth contact Do not use an extension cord power cable without a protective conductor grounding Grounding one conductor of a two conductor o...

Page 12: ...nnector keys Align the dots when inserting the cable connector into the power connector C AU TI O N The probe power cable connector automatically locks in the mating power connector To separate the connectors you must pull on the knurled part of the cable connector housing This releases the lock If you pull on the cable the connectors won t release and you may damage the connector or cable 4 Conne...

Page 13: ...e probe to the signal to be measured 5 If you are using Variable offset adjust the Coarse and Fine offset controls so the desired part of the signal is displayed on the oscilloscope When the knobs are turned clockwise the output of the probe goes positive For example when using the probe with an oscilloscope when the trace moves up the horizontal center line of the screen represents a more negativ...

Page 14: ...e Input Connections Pin Function Connector 1 N C 2 Probe 1 offset common 3 N C 4 Probe 2 offset common 5 Shield 6 N C 7 Probe 1 offset 8 N C 9 Probe 2 offset Operating Range The remote variable offset can be used when the Local Remote function is set to Remote The remote inputs for the two probe connectors are separate The following conditions apply The remote offset input range is 10 to 10 Vdc Th...

Page 15: ... of the remote input connector To eliminate offset when using remote the remote offset input must be set to 0 0 V disconnected or grounded To minimize dc offset errors and potential noise coupling caused by ground loops electrically isolate all connections between the remote input connector and the controlling system Operating the Power Module Remote Offset Input 15 ...

Page 16: ...16 ...

Page 17: ...nterval 25 Equipment Required 25 To test output voltages 26 Making Adjustments 27 Safety 27 Adjustment Interval 27 Equipment Required 27 To prepare the equipment 29 To adjust power supply voltages 29 To adjust power supply current limits 30 To adjust offset zero 31 Troubleshooting and Repair 32 To troubleshoot the power supplies 32 To troubleshoot the offset circuitry 33 To disassemble the instrum...

Page 18: ...18 ...

Page 19: ...d Power Module The following topics are included in this chapter Specifications and Characteristics Recommended Test Equipment Repair Strategy Returning to Agilent Technologies for Service Testing Performance Making Adjustments Troubleshooting Replacing Parts Theory of Operation Schematics 19 ...

Page 20: ...Table 2 Performance Characteristics Supply Output Voltage 17 3 Vdc 500 mV 17 3 Vdc 500 mV Supply Current for each supply 300 mA Offset Current for each probe Variable from 0 to 5 mA Operating Characteristics The following are the operating characteristics for the 1143A Table 3 Operating Characteristics Number of probes operated 2 Controls for each probe Remote Local Zero Variable offset Coarse and...

Page 21: ...5 000 ft up to 15 300 meters 50 000 ft Vibration Random vibration 5 to 500 Hz 10 minutes per axis 0 3 grms Random vibration 5 to 500 Hz 10 min per axis 2 41 grms Resonant search 5 to 500 Hz swept sine 1 octave min sweep rate 0 75g 5 min resonant dwell at 4 resonances per axis Power Requirements 90 to 132 198 to 264 Vac 47 to 440 Hz 40 VA maximum Weight Net approximately 1 5 kg 3 4 lb Shipping appr...

Page 22: ... ISM Group 1 Class A equipment SABS RAA Act No 24 1990 Immunity EN50082 1 Code1 Notes2 IEC 801 2 ESD 8kV AD IEC 801 3 Rad 3 V m IEC 801 4 EFT 1kV 1 1 1 1 Performance Codes 1 PASS Normal operation no effect 2 PASS Temporary degradation self recoverable 3 PASS Temporary degradation operator intervention required 4 FAIL Not recoverable component damage 2 Notes None Service General Information 22 ...

Page 23: ...M Accuracy 0 1 3457A P A T Resistor 511 Ω 0 5 W 1 0757 0814 A Resistor 50 Ω 10 W 1 0811 3707 A P Performance Tests A Adjustments T Troubleshooting Service Strategy The 1143A Probe Offset Control and Power Module consists of simple power supplies and op amp variable current sources Circuitry is simple and components are available off the shelf so the service strategy is component level repair The t...

Page 24: ...ccessories unless they are associated with the failure symptoms 3 Protect the instrument by wrapping it in plastic or heavy paper 4 Pack the instrument in foam or other shock absorbing material and place it in a strong shipping container You can use the original shipping materials or order materials from an Agilent Technologiessales office If neither are available place 3 to 4 inches of shock abso...

Page 25: ...d test interval is yearly or every 2 000 hours of operation Amount of use environmental conditions and the user s experience concerning need for testing will contribute to verification requirements The adjustment interval is covered in the Making Adjustments section Equipment Required A complete list of equipment required for maintenance is the Recommended Test Equipment table in this chapter The ...

Page 26: ...power connectors Either connector can be measured to check the voltage accuracy Both can be measured to assure both connectors have power Probe Power Output Connector 1 Connect the mains power to the power module and turn the front panel power switch on 2 Measure the voltage between ground and pin 1 of the connector It should be 17 3 Vdc 500 mV 3 Measure the voltage between ground and pin 2 of the...

Page 27: ...ance by persons unaware of the hazards involved for example fire and electric shock can result in injury or death Adjustment Interval There is no recommended adjustment interval for the power module These adjustments are considered factory adjustments and do not require periodic maintenance Make adjustments only when directed by other service procedures Defining an adjustment interval will depend ...

Page 28: ...Positive Voltage Adjust R38 Positive Current Threshold R60 Negative Current Threshold R61 Probe 1 Offset Zero R9 Probe 2 Offset Zero R27 17 3 V TP1 17 3 V TP2 Ground TP5 Probe 1 Offset TP3 Probe 1 Offset TP3 Service Making Adjustments 28 ...

Page 29: ...ges This procedure adjusts the power supply voltages The adjustment adjusts the 17 3 V supply directly The 17 3 V supply tracks the 17 3 V supply Equipment Required Equipment Critical Specification Recommended Model Part Digital Multimeter Better than 0 1 accuracy 3458A Make sure there is no load on the supplies Use the adjustment locator on the previous page to find the test points and adjustment...

Page 30: ...nts and adjustments 1 Connect the DVM between TP5 ground and TP1 17 3V 2 Connect the 50 Ω resistor between TP5 and TP1 3 Adjust R60 Positive Current Threshold for a reading of 16 7V 300 mV 4 Connect the DVM between TP5 ground and TP2 17 3V 5 Disconnect the 50 Ω resistor from TP1 and connect it to TP2 between TP5 and TP2 6 Adjust R61 Negative Current Threshold for a reading of 16 7V 300 mV 16 4 to ...

Page 31: ...it It will give the wrong result 1 Set the front panel Probe 1 and Probe 2 offset controls for Zero and Local 2 Connect the DVM between TP5 ground and TP3 Probe 1 Offset 3 Connect the 511 Ω resistor between TP5 and TP3 4 Adjust R9 Probe 1 Offset Zero for a reading of 0 0V 100 µV 5 Connect the DVM between TP5 ground and TP4 Probe 2 Offset 6 Disconnect the 511 Ω resistor from TP3 and connect it to T...

Page 32: ...intenance by persons unaware of the hazards involved for example fire and electric shock can result in injury or death To troubleshoot the power supplies The circuitry consists of simple power supplies Use conventional troubleshooting techniques A complete parts list component locator and schematics are provided later in this chapter Following are some things to check first given certain failure s...

Page 33: ...parts list component locator and schematics are provided later in this chapter 1 Load the appropriate offset output circuit with a 511 Ω resistor For probe 1 connect the resistor between TP5 and TP3 and for probe 2 connect it between TP5 and TP4 2 Measure the offset output voltage TP3 for probe 1 or TP4 for probe 2 With the controls set to Local and Zero the voltage should be adjustable R9 probe 1...

Page 34: ...ab on the rear panel of the instrument 4 At the PC board disconnect the cables that connect the front panel probe power outputs 5 Note the orientation of the knobs Remove the four knobs 6 On the bottom of the instrument remove the 5 mm screw that fastens the transformer support 7 Remove the following pan head screws Three directly on the PC board Two on the ac input connector Two on the heatsink 8...

Page 35: ...part number Manufacturers Codes A list of manufacturers codes is given in table 8 page 42 The codes are given for parts in the parts lists The table gives the manufacturer and address for each code Component Locator A component locator for the power and control assembly A1 is shown in figure 6 page 43 Table 9 page 42 references the parts on the assembly to a grid location on the drawing Ordering I...

Page 36: ...hrough a local Agilent Technologies Sales Office when the orders require billing and invoicing Prepaid transportation there is a small handling charge for each order No invoices In order for Agilent Technologies to provide these advantages please send a check or money order with each order Mail order forms and specific ordering information are available through your local Agilent Technologies offi...

Page 37: ... 1097 2 4 KNOB POINTER 28480 0370 1097 MP5 0403 0727 4 4 FOOT 28480 0403 0727 MP6 5041 0234 5 4 KEYCAP FUNCTION SELECT 28480 5041 0234 MP7 5041 0531 5 1 KEYCAP POWER 28480 5041 0531 W1 8120 1521 6 1 POWER CORD 18 AWG 3 COND 90 IN LG 28480 8120 1521 W2 01143 61601 5 2 CABLE PROBE POWER 28480 01143 61601 Power cord options W1 8120 1703 6 1 CABLE POWER Option 900 UK 28480 8120 1703 W1 8120 0696 4 1 C...

Page 38: ...VDC CER 28480 0160 6500 C15 0160 6500 7 CAPACITOR FXD 0 01UF 10 100VDC CER 28480 0160 6500 C16 0160 6500 7 CAPACITOR FXD 0 01UF 10 100VDC CER 28480 0160 6500 C17 0160 6500 7 CAPACITOR FXD 0 01UF 10 100VDC CER 28480 0160 6500 C18 0160 6500 7 CAPACITOR FXD 0 01UF 10 100VDC CER 28480 0160 6500 C19 0160 6500 7 CAPACITOR FXD 0 01UF 10 100VDC CER 28480 0160 6500 C20 0160 6500 7 CAPACITOR FXD 0 01UF 10 1...

Page 39: ...14 2N3906 Q4 1853 0036 2 TRANSISTOR PNP SI PD 310MW FT 250MHZ 27014 2N3906 R1 0698 3161 9 2 RESISTOR 38 3K 1 0 125W TF TC 0 100 24546 CT4 1 8 T0 3832 F R2 0698 3271 2 2 RESISTOR 115K 1 0 125W TF TC 0 100 24546 CT4 1 8 T0 1153 F R3 0698 4517 1 2 RESISTOR 127K 1 0 125W TF TC 0 100 24546 CT4 1 8 T0 1273 F R4 0757 0458 7 2 RESISTOR 51 1K 1 0 125W TF TC 0 100 24546 CT4 1 8 T0 5112 F R5 0699 1301 7 2 RE...

Page 40: ...ISTOR 4K 0 1 0 125W TF TC 0 25 28480 0698 6322 R34 0698 6362 8 RESISTOR 1K 0 1 0 125W TF TC 0 25 28480 0698 6362 R35 0698 6362 8 RESISTOR 1K 0 1 0 125W TF TC 0 25 28480 0698 6362 R36 0698 6624 5 RESISTOR 2K 0 1 0 125W TF TC 0 25 28480 0698 6624 R37 0757 0288 1 1 RESISTOR 9 09K 1 0 125W TF TC 0 100 19701 5033R 1 8 T0 9091 F R38 2100 3211 7 1 RESISTOR TRMR 1K 10 TKF TOP ADJ 1 TRN 28480 2100 3211 R39...

Page 41: ...3132 4 1 SWITCH 4 STATION ASSEMBLY 28480 3103 3132 S2 3101 0555 9 1 SWITCH PUSH BUTTON DPDT 4A 250 VAC 28480 3101 0555 S3 3101 2609 8 1 SWITCH SLIDE DPDT 5A 250VAC PC 28480 3101 2609 T1 9100 4750 8 1 TRANSFORMER POWER with mounting hardware 28480 9100 4750 TP1 0360 0535 0 5 TERMINAL TEST POINT 28480 0360 0535 TP2 0360 0535 0 TERMINAL TEST POINT 28480 0360 0535 TP3 0360 0535 0 TERMINAL TEST POINT 2...

Page 42: ...6 F 2 C17 F 2 C18 H 3 C19 G 3 C20 F 3 Ref Des Grid Loc C21 G 3 C22 H 4 C23 H 1 C26 F 5 C27 F 5 CR1 B 1 CR2 B 2 CR3 H 4 DS1 B 1 E1 D 5 E2 D 5 F1 D 5 J1 C 6 J2 G 6 J3 H 4 Ref Des Grid Loc J4 H 5 Q1 E 2 Q2 E 4 Q3 G 5 Q4 H 4 R1 G 1 R2 G 1 R3 G 1 R4 G 1 R5 G 1 R6 G 2 R7 B 1 R8 C 1 R9 D 2 R10 H 2 R11 H 2 R12 G 2 R13 G 2 Ref Des Grid Loc R14 G 2 R15 G 2 R16 H 2 R17 H 3 R18 G 2 R19 G 3 R20 G 3 R21 G 3 R22...

Page 43: ...Figure 6 Power and Control Assembly Component Locator Service Troubleshooting and Repair 43 ...

Page 44: ...itive supply causes a voltage increase in the negative supply Each supply has a current limit adjustment which is adjusted at the factory for limiting at 330 mA The supplies use a linear regulator that allows a low differential between the input voltage and the regulated output voltage The output drives a pass transistor which drives the load with it s collector A simplified diagram of the voltage...

Page 45: ...clean start when power is applied The current limit circuit works the same as the one in the positive supply Offset Control The probe 1 and probe 2 offset circuits are virtually identical The probe 1 circuit will be described Use schematic 3 figure 10 page 50 for the following discussion U3 a 1 23 V voltage reference provides a reference for the internal offset control A fixed portion of the refer...

Page 46: ...46 ...

Page 47: ...uits This helps avoid nonfunctional clutter on the schematic and gives one place to show IC power connections when IC sections are split between schematics Unless otherwise noted the following component values apply Resistance is in ohms Capacitance is in microfarads Inductance is in microhenries Symbols on schematics are based on current ANSI and IEEE standards Additional schematic symbols are sh...

Page 48: ...Figure 8 Schematic 1 Line Input and Positive Supply 1 Service Troubleshooting and Repair 48 ...

Page 49: ...Figure 9 Schematic 2 Negative Supply 2 Service Troubleshooting and Repair 49 ...

Page 50: ...gure 10 Schematic 3 Probe 1 Offset Control IC Connections Not Shown schematics 3 4 Connection Pin IC Group 17 3 V 8 U1 U4 17 3 V 4 17 3 V 7 U2 U5 17 3 V 4 NC 1 5 8 3 Service Troubleshooting and Repair 50 ...

Page 51: ...Figure 11 Schematic 4 Probe 2 Offset Control Probe Power Cable Diagram W2 4 Figure 12 J1 Service Troubleshooting and Repair 51 ...

Page 52: ...52 ...

Page 53: ... list for instrument 37 parts list for PC board 38 parts locator drawing 43 parts locator table 42 performance characteristics 20 power requirements 11 21 power supplies adjusting current limits 30 adjusting voltage 29 testing voltage 26 theory 44 troubleshooting 32 probe power cable 12 probe power cable connector 12 probe power cable lock 12 protective earth ground 11 protective fuse 11 R recomme...

Page 54: ... EN 60555 3 1987 A1 1991 IEC 801 2 1991 EN 50082 1 1992 4 kV CD 8 kV AD IEC 801 3 1984 EN 50082 1 1992 3 V m 1kHz 80 AM 27 1000 MHz IEC 801 4 1988 EN 50082 1 1992 0 5 kV Sig Lines 1 kV Power Lines Supplementary Information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC and carries the CE marking accordingly This product w...

Page 55: ...rained service personnel To avoid dangerous electric shock do not perform any service unless qualified to do so Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present If you energize this instrument by an auto transformer for voltage reduction make sure the common terminal is connected to the earth terminal of the power sourc...

Page 56: ...le and exclusive remedies Agilent Technologies shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products For any assistance contact your nearest Agilent Technologies Sales Office Cer...

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