Name: Keithley 2002
Brand: Keithley
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Troubleshooting

2-60

Bit patterns

Test 305.4 — 20V range multiplexer signal

Type

Pass/Fail

Fault message

20V range MUX signal

Description

The ohms source is in the same conﬁguration as test 304.1 to create 6V at input HI, which is the

HI input terminal to the DMM. This signal is then switched through the Q246, Q245, Q244 path

to BUFFIN. Q205 is turned on so that the signal reaches R240, and Q203 is always on because

its gate and source are tied together by R241. 3V appears at U217 pin 3. Since U217 is a unity-

gain buffer, 3V also appears at R261, and U222 switches pin 7 to pin 3 of U226. X1 gain is

achieved by closing U227 pins 2 to 3 with /X1 low, and R274 is in the feedback path of U226.

Drawing reference

Analog Board; 2002-100

Components

Q205, U217, U222, U226, U227, and associated components.

Bit patterns

Bit pattern* Register

—U400—

01111011

—U811—

00001101

—U224—

00010111

—U432—

10000000

—U810—

00000011

—U206—

01110100

—U203—

10001110

—U411—

11111011

—U809—

11100111

—U207—

00001111

—U221—

11101001

—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.

Bit pattern* Register

—U400—

01111011

—U811—

00001101

—U224—

00010111

—U432—

10000000

—U810—

00000011

—U206—

01111000

—U203—

11110100

—U411—

11111011

—U809—

11100111

—U207—

01101111

—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

Questions and Answers:

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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