3 Calibration Procedures
88 Keysight 34420A Service Guide
Injected Current Verification (Optional)
This optional procedure checks the injected current level. Injected current varies
with the power line configuration and frequency. You should, therefore, verify
injected current using the same power line configuration as the intended use.
Injected Current Verification Procedure
1 Connect the DMM and the meter to the same power line receptacle.
2 Set the DMM to measure AC Volts rms on the 100 mV range.
3 Set the Keysight 34420A to the following configuration:
Channel 1 input
7½ digits (100 PLC)
Filters OFF
4 Connect the DMM, capacitor, and meter as shown.
5 Measure the rms voltage on the DMM. With the setup shown, 1 mV rms is
equivalent to 1 nA rms of injected current. Verify the measured voltage is <18
mV rms (for peak-to-peak values, multiple the measured rms voltage by 2.8).
The DMM input impedance must be 1 MQ to perform this procedure.
DMM
1 Mohm
+
-
1000 pF
Channel 1 LO
Keysight 34420A
Meter
LO
Common
Power Line
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