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4 Calibration Procedures

96 Keysight 34970A/34972A Service Guide

(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).

Tests 1 - 5:

See the diagram on page 97 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/34972A. Record the 4-wire ohms

measurements from the external DMM in the table below.

NOTE

Be sure to read “Plug-in Module Test Considerations” on page 94.

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.

Test #

External DMM Ohmmeter Connections

Measured Value

HI LO HI Sense LO Sense

1 L401 J101, C14 L401 J101, C14 _____________ Ohms

2 L402 J101, C15 L402 J101, C15 _____________ Ohms

3 Add (Test 1 + Test 2) _____________ Ohms

4 F501 C21 I F501 C21 I _____________ Ohms

5 F502 C22 I F502 C22 I _____________ Ohms

NOTE

Connect bare copper wires (approximately 3 cm in length) to the I terminals of

Channels 21 and 22 as shown below. These wires will be used to make shorts

across the channels in Tests 6 through 39.

Keysight Technologies 34972A Service Guide

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