Agilent 34970A/34972A Data Acquisition / Switch Unit

Chapter 4 Calibration Procedures
Relay Verification
Tests 34 - 36:
Close only channels Channels 20 and 22. Remove the 34901A from the
34970A/34972A and do not reinstall it for these tests.
On connector J101, remove the jumper between pins C14 and C15 (the
top jumper shown in the diagram on page 101). On the remaining jumper
connected to J101 (the bottom jumper shown in the diagram), move the
end of the jumper from pin C12 to pin C16; the jumper should now short
pins C13 and C16 together.
Cut, but do not remove, the copper shorts on Channels 21 and 22 (the
wires will be used for the 4-wire ohms measurements below). Add a
copper short between the L and H terminals on Channel 20. Record the
measured value as Test 34 in the table below.
Using the external DMM, make a 4-wire ohms measurement between
the L and I terminals on Channel 21. Record the measured value as Test
35 in the table below.
External DMM Ohmmeter Connections
Test
#
Channel
Closed
HI LO HI
Sense
LO
Sense
Measured Value
Test
Limit
Relay
Measured
34 Ch 20* P3 P3 P2 P2 ________Ohms 2.00 K420
35 Ch 22* Ch 21 I Ch 21 L Ch 21 I Ch 21 L ________Ohms — —
36 Subtract (Test 35 - Test 4) ________Ohms 2.00 K523
*The latching relays remain closed when the module is removed from the 34970A/34972A.
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