4 Calibration Procedures
80 Keysight 34970A/34972A Service Guide
Internal DMM Verification Tests
These procedures use inputs connected to a 34901A 20-Channel Multiplexer (see
page 69) installed in slot 200.
Zero Offset Verification
This procedure is used to check the zero offset performance of the internal DMM.
Verification checks are only performed for those functions and ranges with unique
offset calibration constants. Measurements are checked for each function and
range as described in the procedure below.
Zero Offset Verification Procedure
1 Make sure you have read “Test Considerations” on page 76.
2 This procedure will measure the shorts installed on Channels 209 and 219.
Leave the Amps input connections (Channel 221) open.
3 Select each function and range in the order shown in the table below. Before
executing each test, you must press to enable reading monitoring on the
selected channel (or use the ROUTe:MON command from the remote interface).
Compare measurement results to the appropriate test limits shown in the table
(see page 79).
Input
Channel 221
Quick
Check
[a]
Error from Nominal
Function
[b]
Range 24 hour 90 day 1 year
Open
Open
Open
DC Current
10 mA
100 mA
1A
Q
± 1 mA
± 4 mA
± 60 mA
± 2 mA
± 5 mA
± 100 mA
± 2 mA
± 5 mA
± 100 mA
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