(Optional)
34908A Relay Contact Resistance Verification
This optional procedure uses an external DMM to make 4-wire ohms
measurements across the relay contacts on the 34908A. Note that when
measuring the resistance of the contacts of the channels relays, the test
also includes the Bank Switch.
Note: Be sure to read “Plug-in Module Test Considerations” on page 87.
Test 1: See the diagram on page 107 for the required connections for this test
(be sure to probe the inductor at the indicated location). For this
measurement, the 34908A is not installed in the 34970A. Record the
4-wire ohms measurements from the external DMM in the table below.
External DMM Ohmmeter Connections
Test
#
HI LO
HI
Sense
LO
Sense
Measured
Value
1 L400 J101, C12 L400 J101, C12 __________ Ohms
Chapter 4 Calibration Procedures
Relay Verification
106
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