Name: Keithley 2002
Brand: Keithley
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Troubleshooting

2-108

Test 501.2 — Amps bootstrap

Type

Pass/Fail

Fault message Amps bootstrap

Description The 7.2mA ohms source is switched in using the /OHMA line at U223 and U220. U232 pin 2

to 3 connects the REFBUF to U233 pin 3. The 7.2mA current divides between Q211 and Q212,

then ﬂows through Q213, R322, CR217, K201, R334 and R342. This point is the HI input ter-

minal to the DMM. The HI to AMPS jumper routes the current to the AMPS line. All of the amps

range switches are off. All current ﬂows through CR218, and the voltage is clamped at two diode

drops (approximately 1.2V) by CR218. This voltage is fed to U225 pin 3, which is at unity gain

so this voltage is at the AMPBOOT line. AMPBOOT is switched through U222 to the A/D MUX

U226, and the gain is X1.

NOTE: INPUT HI and AMPS must be externally jumpered to run this test.

Drawing reference Analog Board; 2002-100

Components U220, U222, U223, U225, U226, U232, U233, and associated components.

Bit patterns

Bit pattern* Register

—U400—

01111011

—U811—

00001101

—U224—

00010111

—U432—

10000000

—U810—

00000011

—U206—

01110000

—U203—

10001110

—U411—

11111011

—U809—

11100111

—U207—

11101111

—U221—

01110111

—U406—

00000100

AD_STB

MUX_STB

R1_STB

R2_STB

*Bits associated with register IC terminals as follows:

QQQQQQQQ

87654321 87654321 87654321 87654321

IC pins: Q8=11, Q7=12, Q6=13, Q5=14, Q4=7, Q3=6, Q2=5, Q1=4.

Other manuals for Keithley 2002

User Manual366 pages

Getting Started Manual95 pages

Calibration Manual114 pages

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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