Calibration Manual

Repair Manual Routine Maintenance Introduction ... 1-1 Line fuse replacement ... 1-1 Current fuse replacement ... 1-2 Front AMPS input fuse ... 1-2 Rear AMPS input fuse ... 1-3 Fan Filter cleaning ... 1-3 Firmware updates ... 1-3 Troubleshooting Introduction ... 2-1 Repair considerations ... 2-2 Power-on test... 2-2 Front panel tests ... 2-2 KEYS test... 2-2 DISPLAY PATTERNS Test... 2-2 Character set test ... 2-3 Diagnostics... 2-3 Control register bit patterns... 2-3 Control register ICs ... 2-3 Normal operation bit patterns ... 2-3 Display board checks ... 2-5 Power Supply checks ... 2-5 Principles of operation ... 2-6 Block diagrams ... 2-6 Display board circuit theory... 2-11 Power Supply circuit theory ... 2-11 Built-in test overview... 2-12 Using Built-In Test... 2-15 AUTOMATIC Testing... 2-15 MANUAL Testing ... 2-15 Built-In test documentation... 2-17 Memory element tests ... 2-18 Digital I/O tests ... 2-19 IEEE-488 bus tests ... 2-20 Triggers tests ... 2-21 A/D Converter tests... 2-23 Integration tests ... 2-27 A/D multiplexer tests ... 2-49 Temperature sensor test ... 2-5A/D Converter ground multiplexer tests ... 2-52 Input buffer tests ... 2-55 Open-circuit ohms tests ... 2-56 20V range multiplexer tests ... 2-58 Ohms tests... 2-61 100:1 input divider test ... 2-63 Overload tests ... 2-64 Calibration/frequency compensation DAC tests ... 2-67 Regulator and switching tests ... 2-70 Absolute value circuit X1 gain tests ... 2-72 Absolute value circuit, X10 gain tests ... 2-75 Sample and hold tests ... 2-80 Front end X1, /100, /500 tests... 2-84 /200 frequency compensation tests... 2-86 /750 frequency compensation tests... 2-90 True RMS Converter and Filter tests... 2-94 Frequency tests ... 2-96 Amps/low ohms tests... 2-102 Amps protection tests ... 2-107 ACA switch test... 2-109 Ohms sense tests ... Disassembly Introduction ... 3-1 Handling and cleaning precautions... 3-1 PC-board handling ... 3-1 Solder repairs ... 3-1 Special handling of static-sensitive devices ... 3-2 Case cover and shield removal ... 3-2 Case cover removal... 3-2 Analog board top shield removal... 3-2 PC-board removal... 3-3 Digital board ... 3-3 A/D Converter board ... 3-3 Analog board ... 3-3 Front panel disassembly ... 3-4 Cooling fan removal ... 3-5 Main CPU firmware replacement... 3-5 Instrument re-assembly... 3-6 Assembly drawings... 3-6 Replaceable Parts Introduction ... 4-1 Parts lists... 4-1 Ordering information ... 4-1 Factory service... 4-1 Component layouts ... 4-1 Specifications ...A-1