3 Calibration Procedures
40 Keysight 34980A Service Guide
Internal DMM
Input Connections
Test connections to the internal DMM are best accomplished using the rear panel
Analog Bus connector (ABus). You may need to remove the cover for access to
this connector. A test fixture can be constructed using a standard DB9 male
connector, some shielded twisted pair PTFE insulated cables, and appropriate
connectors for the calibrator output you are using.
You may also use one of the multiplexer modules to connect the calibrator output
to the DMM. If you use a multiplexer module, you must take into account any
additional relay contacts and resistances in the measurement path. To do this, use
the switch/measure model to set up the DMM and switches, not the scan model.
For example, send:
conf:fres 100;:rout:clos (@1001,1021,1911,1922)
read? (should return something close to zero)
cal:val 0
cal?
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