iv
5.2.8. IEEE-488 Output Buffering......................................................................................................................5-5
5.2.9. IEEE-488 Deadlock...................................................................................................................................5-5
5.3. RS232C INTERFACE......................................................................................................................................5-6
5.3.1. RS232C - Pin Designations.......................................................................................................................5-7
5.3.2. RS232C Responses. ..................................................................................................................................5-7
5.4. COMMAND LANGUAGE..............................................................................................................................5-8
5.4.1. General Syntax For Commands................................................................................................................5-8
5.4.2. General Syntax For Numbers....................................................................................................................5-8
5.5. REMOTE AND LOCAL OPERATION........................................................................................................5-8
6. CALIBRATION..........................................................................................................6-1
6.1. TEST EQUIPMENT.........................................................................................................................................6-1
6.2. RATIO 1:1 Using Model 9330 / 1 to Model 9330 / 1 ............................................................................6-1
6.3. RATIO 1:1 Using Model 9330 / 10 k to Model 9350 / (10 k Configuration).....................................6-1
6.4. RATIO 10:1........................................................................................................................................................6-2
1.1.1. Model 9330 /10 k to Model 9350 /(100 k Configuration) .................................................................6-2
6.4.2. Model 9350 /(1K Configuration) to Model 9330 /10 k ....................................................................6-2
6.5. RATIO 1:1..........................................................................................................................................................6-1
6.5.1. Model 9330 /100 M to Model 9330 /100 M.......................................................................................6-1
7. MAINTENANCE........................................................................................................7-1
7.1. INTRODUCTION.............................................................................................................................................7-1
7.1.1. Error Messages..........................................................................................................................................7-1
7.1.2. 6675A Warnings. ......................................................................................................................................7-2
7.1.3. Nanovolt Detector Calibration..................................................................................................................7-3
7.1.3.1. Introduction. .........................................................................................................................................7-3
7.1.3.2. Nanovoltmeter Calibration...................................................................................................................7-3
7.1.3.3. ADC Beta. ............................................................................................................................................7-4
7.1.4. Disassembly Procedure. ............................................................................................................................7-5
7.1.4.1. Cover Removal Procedure. ..................................................................................................................7-5
7.1.4.2. Primary Current Drive Module (19327) Removal Procedure.............................................................7-5
7.1.4.3. Servo-loop Module (19328) Removal Procedure................................................................................7-6
7.1.4.4. PDCC Comparator Module (19121) Removal Procedure...................................................................7-7
7.1.5. Reassembly Procedure ..............................................................................................................................7-8
7.2. TROUBLESHOOTING...................................................................................................................................7-8
7.2.1. Introduction ...............................................................................................................................................7-8
7.2.2. Power Up...................................................................................................................................................7-8
7.2.3. Power Supply Check.................................................................................................................................7-9
7.2.3.1. Primary Current Drive Power Supply PCB Test Procedure................................................................7-9
7.2.3.2. Servo Loop Power Supply PCB Test Procedure...............................................................................7-10
7.2.3.3. Nanovolt Dual Power Supply PCB Assy 19334 Test Procedure......................................................7-11
7.2.3.4. 6675A CPU and Display Power Supply PCB Test Procedure..........................................................7-12
7.2.4. Alignment Procedure..............................................................................................................................7-12
7.2.4.1. Alignment Test Equipment Required ................................................................................................7-12
7.2.4.2. Initial Checks......................................................................................................................................7-13
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