Keithley 2001 Repair Manual

Troubleshooting
2-4
302 Series
302.1
302.2
Ohms:
Zero Reference Measure-
ment (for next test)
Open Circuit Ohms and
Ohms Protection
303 Series
303.1
303.2
303.3
Input Path:
Zero Reference Measure-
ment (for next test)
Open Circuit Ohms and
Ohms Protection
Front End (FE) Zero Pro-
tection
304 Series
304.1
304.2
304.3
304.4
304.5
304.6
304.7
Ohms Sources:
Zero Reference Measure-
ment (for tests 304.2 -
304.7)
0.98mA and 9.2mA Ohms
Sources
89 µ A and 0.98mA Ohms
Sources
7 µ A and 89 µ A Ohms
Sources
770nA and 7 µ A Ohms
Sources
70nA and 770nA Ohms
Sources
4.4nA and 770nA Ohms
Sources
305 Series
305.1
305.2
Input Divider:
Zero Reference Measure-
ment (for next test)
Divide by 100
306 Series
306.1
Switching:
Ohms Cal Switch
307 Series
307.1
307.2
307.3
Cal Divider:
Zero Reference Measure-
ment (for next test)
A/D MUX /10
A/D MUX /Buffer (x-0.5)
Table 2-1 (cont.)
Built-in-test summary
Test Circuit tested/exercised
308 Series
308.1
308.2
4-Digit Mode:
A/D MUX 4-Digit Signal
Path
A/D MUX 4-Digit Zero
Path
309 Series
309.1
309.2
309.3
309.4
309.5
309.6
Amps:
200 µ
A Range
2mA Range
20mA Range
Reference Measurement
(for tests 309.5 and 309.6)
200mA Range
2A Range
310 Series
310.1
Protection:
Amps Protection
400 Series
400.1
400.2
400.3
400.4
400.5
Digital-to-Analog Converter
(DAC):
-4.21V Output
-2.08V Output
-0.001V Output
+2.25V Output
+4.33V Output
401 Series
401.1
Signal Switching:
Zero Cal Switch
402 Series
402.1
Signal Switching:
Frequency Switch
403 Series
403.1
Signal Switching:
Ground Switch
404 Series
404.1
404.2
404.3
404.4
404.5
Absolute Value (x1 Gain):
-Full Scale DAC Output
-Half Scale DAC Output
Zero DAC Output
+Half Scale DAC Output
+Full Scale DAC Output
Table 2-1 (cont.)
Built-in-test summary
Test Circuit tested/exercised

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