HP 3484A Operating And Service Manual page 6

Table of Contents
Model 3484A
TABLE OF CONTENTS (Cont'd)
Section V. (Cont'd) Page
5-34.
5-35.
5-36.
5-37.
5-41.
5-42.
5-47.
5-53.
5-56.
5-58.
5-59.
5-60.
5-61.
Troubleshooting ....... ...... ........ 5-10
DC Amplifier Zero Offset ............ 5-1
O
DCV Display Limiting .. . .. .......... 5-10
DC Amplifier Gain Errors ............ 5-10
DCV Reed Relay Checks ............. 5-1 1
Ranging Checks .................... 5-11
Delay Generato r Checks . .......... .. 5-11
Isolated Remote Assembly, Option 041 .. 5-1 3
Ohms Converter, Option 042 .......... 5-13
Factory Selected Components .......... 5 -14
DC Amplifier Assembly A2 ........... 5-14
A6R7* . . . ........................ 5-14
A6R25* .............. .. .......... 5-14
Section Page
VI. REPLACEABLE PARTS . . . . . . . . . . . . . . . . . . 6-1
6-1. introduction ........... .... ........ 6-1
6-4. Ordering Information ..... ..... ...... 6-1
6-6. Non-Listed Parts . ....... ........... . 6-1
Section Page
VII. CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . 7-1
7-1. Introduction ...... ........ . . ...... . 7-1
7-2. Notes ........... . ................ 7-1
Appendices
A. CODE LIST OF MANUFACTURERS
B. SALES AND SERVICE OFFICES
LIST OF TABLES
Number
Page
Number
Page
1-1 . Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
3-1. Delay and Response Times .............. .... 3-2
3-2. Interface Signals . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3-3. Ohmmeter Current .. ....... ...... ...... . . . 3-6
4-1. DC Voltage Range Relays . . ...... . .......... 4- 1
5-1. Required Test Equipment ................... 5-0
5-2. DCV Accuracy and Linearity Check .......... . 5-2
5-3. Ohmmeter Accuracy Check ................. 5-5
5-4. DC Amplifier Gain Errors .................. 5-10
5-5. DCV Recd Relay Checks ............... . . . . 5-12
5-6. Delay Timing . ... .. .. ... ...... ........ .. 5-13
4-2. Logic Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -2
5-7. Ohms Converter Reed Relay Checks .......... 5-15
4-3. Range Register Content .... . . . ............. 4-5
6-1. Replaceable Parts ...... . . .. ......... . . . ... 6-2
LIST OF ILLUSTRATIONS
Number
Page
1-l. Model 3484A Mult ifun ction Unit . ..... . ... ... I -1
2-l . Plug-in Drawer Installation and Removal ....... 2-2
2-2. Isolated Remote Option Installation . . . . . . . . . . . 2-3
2-3 . Location of Switch Limit Stops .............. 2-3
3-1. Front and Rear Panel . . . . .................. 3-0
3-2. External Trigger Connections ................ 3-2
3-3. Remote Connector JJ 4 ........... .... ...... 3-3
3-4. Isolated Remote Program Sequence ..... ...... 3-4
3-5. Guard Connection . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
4-1. Simplified Block Diagram ........... ... . .... 4-1
4-2. Simplified Diagram, DC Amplifier ...... ...... 4-3
4-3 . Autorange Control Circuits . . ................ 4-4
4-4. Simplified Range Register Diagram ...... ...... 4-5
4-5. Remote Selection of Highest Range ........... 4-6
4-6. Delay Generator Block Diagram .............. 4-7
4-7. Delay and External Trigger Gating ... . ........ 4-8
4-8. Isolated Remote Program Circuit ....... ...... 4-8
4-9. SimpU fied Ohmmeter Diagram ............... 4-9
4-10. True RMS Converter Block Diagram .... .... . .. 4-9
5-1. VDC Accuracy Check ... . . ................. 5-1
5-2. Input Resistance Check . . . . . . . . . . . . . . . . . . . . . 5-2
5-3. DC Common Mode Rejection Check ........... 5-3
5-4. AC Common Mode Rejection Check . . . . . . . . . . . 5-4
5-5. AC Normal Mode Rejection Check . . . . . . . . . . . . 5-4
iv
Number
Page
5-6. Location of Adjustments .... ......... .. . ... 5-6
5-7. Component Replacement ................... 5-8
5-8. Reed Removal and Replacement ............ . . 5-9
5-9. DC Amplifier Diagram .................... 5-11
5-10.DC Amplifier Input Connections .......... .. 5-13
5-11. Ohms Converter Resistances ................ 5-14
5-12. DC Zero Offset Troubleshooting Tree ....... . . 5-17
5-13.Limited DC Display Troubleshooting Tree ... .. 5-19
5-14.Autorangc Troubleshooting . . .. ... . .... .... 5-21
6-1. Location of Miscellaneous Parts ...... .... ... 6-12
Schematics and Diagrams
7-1. Location of Assemblies . . . ... ... ............ 7-2
7-2. Block Diagram ........................... 7-3
7-3. DC Attenuator and Amplifier ................ 7-5
7-4. Ranging Circuits .......................... 7-7
7-5. Function Circuits ....................... .. 7-9
7-6. Isolated Remote Option 041 ................ 7-11
7-7. Ohms Converter Option 042 ........... ..... 7-13
7-8. Connections to Range and Function
Assembly A3 .................... . ...... . 7-15
7-9. Plug-in Connector Pl 2 and Remote
Connector 114 ... . . ... ... . ............. . 7-17
7-10.Ground Connections .............. .. ...... 7-19
-
-;
l
-