Keithley 2001 Repair Manual

Table of Contents
i
1 Routine Maintenance
1.1 Introduction.......................................................................................................................................................1-1
1.2 Line fuse replacement .......................................................................................................................................1-1
1.3 Current fuse replacement ..................................................................................................................................1-2
1.3.1 Front AMPS input fuse............................................................................................................................1-2
1.3.2 Rear AMPS input fuse.............................................................................................................................1-2
1.4 Fan filter cleaning .............................................................................................................................................1-3
1.5 Firmware updates..............................................................................................................................................1-3
2 Troubleshooting
2.1 Introduction.......................................................................................................................................................2-1
2.2 Repair considerations........................................................................................................................................2-1
2.3 Power-on test.....................................................................................................................................................2-2
2.4 Front panel tests ................................................................................................................................................2-2
2.4.1 KEYS Test...............................................................................................................................................2-2
2.4.2 DISPLAY PATTERNS Test ...................................................................................................................2-3
2.5 Built-in test........................................................................................................................................................2-3
2.5.1AUTOMATIC Testing2-6
2.5.2 MANUAL Testing...................................................................................................................................2-6
2.6 Diagnostics........................................................................................................................................................2-7
2.7 R1_STB and R2_STB shift registers ..............................................................................................................2-11
2.8 Display board checks ......................................................................................................................................2-14
2.9 Power supply checks.......................................................................................................................................2-14
2.10 Documentation................................................................................................................................................2-15
2.10.1 Display board circuit theory ..................................................................................................................2-17
2.10.2 Power supply circuit theory...................................................................................................................2-17
2.10.3 Built-in test documentation ...................................................................................................................2-18
3 Disassembly
3.1 Introduction.......................................................................................................................................................3-1
3.2 Handling and cleaning precautions...................................................................................................................3-1
3.2.1 PC-board handling...................................................................................................................................3-1

Keithley 2001 Specifications

General

Model	2001
Category	Multimeter
Manufacturer	Keithley
Type	Digital Multimeter
Digits of Resolution	7.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Connectivity	GPIB, RS-232
Display	VFD
Resistance Accuracy	0.008% + 2.0 mΩ
Frequency Accuracy	±0.01%
DC Current Range	10 μA to 3 A
AC Current Range	10 μA to 3 A
Power Supply	100 V to 240 V AC, 45 Hz to 66 Hz