Keithley 2001-TCSCAN User Manual

Service Information
4-5
4. Turn on the Model 2001, and allow it to warm up for one
hour before proceeding.
5. Select the Ω 2W function and the 20 Ω range on the Mod-
el 2001.
6. Temporarily connect a second set of output leads, iden-
tical in length and type to the leads connected to the
scanner card output, to the Model 2001 rear panel HI
and LO INPUT jacks. Be sure to select the rear panel
terminals with the front panel INPUTS switch.
7. Short the free ends of the temporary leads together, and
allow the reading to settle. Enable the Model 2001 REL
mode after settling, and leave REL enabled for the re-
mainder of the path resistance tests.
8. Disconnect the temporary leads from the multimeter,
and connect the output leads from the scanner card to the
rear panel HI and LO INPUT jacks (see Figure 4-2).
9. Close channel 2 as follows;
A. From normal display, press CHAN. The instrument
will display the following:
CHANNEL SELECTION
CLOSE-CHANNEL OPEN-ALL-CHANNELS
B. Select CLOSE-CHANNEL, then press ENTER.
The Model 2001 will display the following:
ENTER CHAN#01 (1-10)
C. Using the range and cursor keys, select channel 02,
then press ENTER.
D. Press EXIT to return to normal display.
10. Note the resistance reading on the Model 2001. Verify
that the reading is <2 Ω .
11. Repeat steps 9 and 10 for channels 3-10. Verify that the
path resistance for each channel is as follows:
• Channels 2-4, 6-9: <2 Ω .
• Channels 5 and 10: <252 Ω .
NOTE
Change to the 2k Ω resistance range when
measuring channels 5 and 10. Always use
the lowest possible range for best accuracy.
12. After completing the tests, turn off the Model 2001 pow-
er, remove the scanner card, and remove all jumper
wires (leave HI and LO shorted for each channel if you
intend to perform contact potential tests).
4.3.6 Contact potential tests
These tests check the EMF (contact potential) generated by
each relay contact pair (HI and LO) for each channel. The
tests use a sensitive digital voltmeter (Model 182) to measure
the contact potential.
Perform the following procedure to check contact potential
of each channel.
1. Connect 1” #22AWG copper jumper wires between the
HI and LO terminals of each channel input (see Figure
4-3).
2. Connect the Model 182 to OUT A HI and LO using the
low-thermal cable (see Figure 4-3).
3. With the power off, install the scanner card in the Model
2001 Multimeter.
4. Turn on the Model 2001 and the Model 182 Sensitive
Digital Voltmeter. Allow the Model 182 to warm up for
two hours before measurement.
5. Select the 3mV range on the Model 182.
6. Select the DCV function on the Model 2001.
7. Using the CHAN key, close channel 2 (see paragraph
4.3.5 for procedure).
8. Verify that the Model 182 reading is <1 µ V.
9. Repeat steps 7 and 8 for all nine channels. The reading
for channels 2-4 and 6-9 should be <1 µ V, and the read-
ing for channels 5 and 10 should be <2 µ V.
10. After completing all measurements, turn off the Model
2001 power, remove the scanner card, and disconnect all
jumpers and test leads.

Keithley 2001-TCSCAN Specifications

General

Brand	Keithley
Model	2001-TCSCAN
Category	Test Equipment
Language	English