Error Message
Description/Remarks
Error 140
26 – 33 GHz FEU Section Failed
Indicates a failure of the 26 - 33 GHz section of the FEU. The 681XXA is still
operable but it will not produce an RF output in the 26 - 33 GHz frequency range.
Error 141
20 – 26 GHz FEU Section Failed
Indicates a failure of the 20 - 26 GHz section of the FEU. The 681XXA is still
operable but it will not produce an RF output in the 20 - 26 GHz frequency range.
Error 142
Sample and Hold Circuit
Failed
Indicates a failure of the sample and hold circuitry on the A10 PCB. The 681XXA
still operates normally but the RF output may be unleveled during square wave
modulation.
Error 143
Slope DAC Failed
Indicates a failure of the level slope DAC on the A10 PCB. The 681XXA still
operates normally but RF output level flatness may be affected during analog
frequency sweeps.
Error 144
RF was Off when Selftest
started. Some tests were
not performed.
Indicates that some self-tests were not performed because RF Output was
selected OFF on the 681XXA front panel. Press the OUTPUT key to turn RF
Output ON and run the instrument self-test again.
Table 6-1.
Self-Test Error Messages (4 of 4)
OPERATOR
ERROR AND WARNING/
MAINTENANCE
STATUS MESSAGES
681XXA OM
6-7
