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What do the various error codes on the 8970B Noise Figure Meter indicate?

The error messages are displayed on the front panel of the noise figure meter in the format E XX or EXXX where XX is between 01 and 80 and XXX is between 100 and 106. The errors will be grouped into functional groups. Special 99.1 can be used to read back the last displayed error message GPIB.

Refer to the 8970B Error Message Data Sheet 8970B Error Messages, Data Sheet