Calibration Procedures 4
Keysight 34970A/34972A Service Guide 101
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 98). 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.
31 Subtract (Test 30 - Test 4) ________Ohms 2.00 W K522
32 Ch 22 P4 P4 P5 P5 ________Ohms — —
33 Subtract (Test 32 - Test 5) ________Ohms 2.00 W K522
[a] Only the channel currently under test should be closed at one time. All other channels should be open.
Test #
Channel
Closed
[a]
External DMM Ohmmeter Connections
Measured Value
Test
Limit
Relay Measured
HI LO HI Sense LO Sense
Test #
Channel
Closed
External DMM Ohmmeter Connections
Measured Value
Test
Limit
Relay Measured
HI LO HI Sense LO Sense
34
Ch 20
[a]
P3 P3 P2 P2 ________Ohms 2.00 W K420
35
Ch 22
[a]
Ch 21 I Ch 21 L Ch 21 I Ch 21 L ________Ohms — —
36 Subtract (Test 35 - Test 4) ________Ohms 2.00 W K523
[a] The latching relays remain closed when the module is removed from the 34970A/34972A.
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