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(Optional)

34901A Relay Contact Resistance Verification

This optional procedure uses an external DMM to make 4-wire ohms

measurements across the relay contacts on the 34901A. The measured

resistance is the series resistance of the two relay contacts (both

contacts are in the same relay).

Note: Be sure to read “Plug-in Module Test Considerations” on page 87.

Tests 1 - 5: See the diagram on page 90 for the required connections for each test

(be sure to probe the components at the indicated location). For these

measurements, the 34901A is not installed in the 34970A. Record the

4-wire ohms measurements from the external DMM in the table below.

Note: The connections to the external DMM are different for each of

Tests 1, 2, 4, and 5. Be sure to verify the connections shown in the

table below for each of the four tests.

External DMM Ohmmeter Connections

Test

HI LO

Sense

Measured

Value

1 L401 J101, C14 L401 J101, C14 __________ Ohms

2 L402 J101, C15 L402 J101, C15 __________ Ohms

3 Add (Test 1 + Test 2) __________ Ohms

4F501

Ch 21 I

F501

Ch 21 I

__________ Ohms

5F502

Ch 22 I

F502

Ch 22 I

__________ Ohms

Module Reference

Chapter 4 Calibration Procedures

Relay Verification

Agilent Technologies 34970A Service Guide

Other manuals for Agilent Technologies 34970A