Keithley 2002 Repair Manual

Troubleshooting
2-8
Figure 2-2
Power supply block diagram
110/120VAC
IN
Fuse: F101
Power
Switch: S101
Power Transformer
T100
110/120V Switching
Q101, Q102, Q103, Q106
U102, U105
K101, K102
±15V Supply
CR113
C112, C113
U107, U109
Bootstrap Supply
CR114 - CR117
C116, C117
+5V Supply
CR112
C114, C115
U110
+15V
COM
-15V
+BS (34V to 38V)
Common 3
-BS (-34V to -38V)
+5V
Digital Common
Figure 2-3
Display board block diagram
Vacuum Fluorescent Display
DS901
Dot Drivers
U901, U905
Grid Drivers
U903, U904
Controller
U902
Key Matrix
S901 - S931
Reset
Tx
Rx

Keithley 2002 Specifications

General

Resolution	8.5 digits
DC Voltage Accuracy	±0.0006%
Maximum DC Voltage	1000 V
Maximum AC Voltage	750 V
Maximum DC Current	3 A
Maximum AC Current	3 A
Connectivity	GPIB, RS-232
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	10 Ω to 1 GΩ
Model	2002
Category	Multimeter
Interface	GPIB, RS-232
AC Current Accuracy	±0.1%
Frequency Range	0.1Hz to 300kHz
Display	VFD
Type	Digital
Power Supply	100-240V AC, 50/60Hz
Current Range (DC)	100 μA to 3 A
Current Accuracy (DC)	±0.01%
Current Range (AC)	100 μA to 3 A
Current Accuracy (AC)	±0.1%
DC Current Range	100 μA to 3 A
AC Current Range	100 μA to 3 A