Agilent 34970A/34972A Data Acquisition / Switch Unit

Chapter 4 Calibration Procedures
Relay Verification
(Optional)
Tests 1 - 5:
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 97.
See the diagram on page 100 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: 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.
4
Module Reference
External DMM Ohmmeter Connections
Test
#
HI LO HI
Sense
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
4 F501 C21 I F501 C21 I _____________ Ohms
5 F502 C22 I F502 C22 I _____________ Ohms
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