Zero-Scale Current Accuracy Verification - Keysight Technologies BT2152B Operating And Service Manual

5 Verification and Calibration
Connect the eight Ethernet cables to the verification fixture and to the back of the BT2152A. Connect
the inputs of the 7½-digit DMM, for voltage or current verification to the banana plugs on the
verification kit. A user-supplied banana-plug cable is recommended.
Verification Fixture - for BT2152B
Connect the Keysight BT2183A verification fixture directly into the two 37-pin D subminiature
connectors on the back of the BT2152B. Connect the inputs of the 7½-digit DMM, for voltage or
current verification to the banana plugs on the verification fixture. A user-supplied banana-plug cable
is recommended. You do not need to provide a 442-ohm resistor for current verification, as it is
included on the fixture.

Zero-Scale Current Accuracy Verification

Verifying the measurement system at zero, the bottom of the range, verifies contribution due to offset
errors in the system. A significant consideration here is verifying the extremely low + 1 µA offset
specification of BT2152A/B's current measurement system. Noise inherent in the BT2152A/B's output
typically requires a 1-minute measurement integration time be used with the DMM to average the
noise out down to a + 1 µA level. However, this can be circumvented by testing the channel at zero by
using an open circuit. For this reason, the BT2152A/B's zero-scale current measurement is verified
prior to making any connection to any channel.
The zero-scale current measurement accuracy procedure is a s follows:
No channel connections are required for the zero-scale current accuracy verification.
Keysight BT2152A/B Operating and Service Guide 111