Error Message
Description/Remarks
Error 100
DVM Ground Offset Failed
Indicates a calibration-related problem. Do Not Attempt to Operate! Refer the
instrument to a qualified service technician.
Error 101
DVM Positive 10V Reference
Indicates either a calibration-related problem or a de10 Volt reference. Do
not Attempt to Operate! Refer the instrument to a qualified service technician.
Error 102
DVM Negative 10V Reference
Indicates either a calibration-related problem or a defective –10 Volt reference . Do
not Attempt to Operate! Refer the instrument to a qualified service technician.
Error 105
Power Supply Voltage(s) out
of Regulation
Indicates one or more of the voltages from the power supply are out of regulation.
Do Not Attempt to Operate! Refer the instrument to a qualified service technician.
Error 106
Power Supply not Locked
Indicates the power supply is not phase-locked to the reference frequency. The
681XXA is still operable in a degraded mode. The RF output may contain more
spurious signals than normal.
Error 107
Sweep Time Check Failed
Indicates the sweep timing is out of tolerance or has failed. If analog sweeps can
be obtained, the 681XXA is still operable in a degraded mode. If analog sweeps
can not be obtained, the 681XXA is operable only in CW or step sweep frequency
modes.
Error 108
Crystal Oven Cold
Indicates the 100 MHz crystal oven has not reached operating temperature. The
681XXA is still operable, but frequency accuracy and stability may be degraded.
Error 109
The 100MHz Reference is not
Locked to the External
Reference
Indicates the reference loop is not phase-locked to the external 10 MHz reference.
The reference loop may phase-lock to the internal 100 MHz time base;
consequently, the 681XXA would continue to operate normally.
Error 110
The 100MHz Reference is not
Locked to the High Stability
10MHz Crystal Oscillator
Indicates the reference loop is not phase-locked to the optional, high stability
10 MHz crystal oscillator. The reference loop may phase-lock to the internal
100 MHz time base; consequently, the 681XXA would continue to operate normally.
Error 111
Fine Loop Osc Failed
Indicates the fine loop is not phase-locked. The 681XXA is still operable but the
accuracy and stability of frequency outputs are greatly reduced.
Error 112
Coarse Loop Osc Failed
Indicates the coarse loop is not phase-locked. The 681XXA is still operable but the
accuracy and stability of the frequency outputs are greatly reduced.
Error 113
Yig Loop Osc Failed
Indicates the Yig loop is not phase-locked. The 681XXA is still operable but the
accuracy and stability of the frequency outputs are greatly reduced.
Error 114
Down Converter LO not Locked
Indicates the Down Converter is not phase-locked. The 681XXA is still operable
but the accuracy and stability of frequency outputs below 2 GHz is greatly reduced.
Table 6-1.
Self-Test Error Messages (1 of 4)
OPERATOR
ERROR AND WARNING/
MAINTENANCE
STATUS MESSAGES
6-4
681XXA OM
