6-6 681XXC OM
Error Message Description/Remarks
Error125
8.4–20 GHz Unlocked and
Unleveled
Indicatesa failure of the 8.4 to 20 GHz YIG-tuned oscillator. Do Not Attempt to
Operate!Refer the instrument to a qualified service techician.
Error126
2–8.4GHz Unlocked and
Unleveled
Indicatesa failure of the 2 to 8.4 GHz YIG-tuned oscillator. Do Not Attempt to Op-
erate!Refer the instrument to a qualified service techician.
Error127
DetectorInput Circuit
Failed
Indicatesa failure of the level detector input circuitry on the A10 PCB. Use caution
andalways determine the output power level when operating the 681XXC in this
condition.
Error128
.01–2 GHz Unleveled Indicatesa failure of the Down Converter leveling circuitry. The 681XXC operates
normallybut will have unleveled RF output in the 0.0 1 - 2 GHz frequency range.
Error129
SwitchedFilter or Level
DetectorFailed
Indicatesa failure of either the switched filter or level detector circuitry. The 681XXC
mayor may not produce an RF output. Use caution and always determine the out-
putpower level when operating the 681XXC in this condition.
Error130
2–3.3GH Switched Filter Indicatesa failure in the 2 - 3.3 GHz switched filter path within the switched filter
assembly.The 681XXC may or may not produce an RF output in this frequency
range.Use caution and always determine the output power level when operating
the681XXC in this condition.
Error131
3.3–5.5 GH Switched Filter Indicatesa failure in the 3.3 - 5.5 GHz switched filter path within the switched filter
assembly.The 681XXC may or may not produce an RF output in this frequency
range.Use caution and always determine the output power level when operating
the681XXC in this condition.
Error132
5.5–8.4 GH Switched Filter Indicatesa failure in the 5.5 - 8.4 GHz switched filter path within the switched filter
assembly.The 681XXC may or may not produce an RF output in this frequency
range.Use caution and always determine the output power level when operating
the681XXC in this condition.
Error133
8.4–13.25 GH Switched Filter Indicatesa failure in the 8.4 - 13.25 GHz switched filter path within the switched
filterassembly. The 681XXC may or may not produce an RF output in this fre-
quencyrange. Use caution and always determine the output power level when
operatingthe 681XXC in this condition.
Error134
13.25–20 GH Switched Filter Indicates a failure in the 13.25 - 20 GHz switched filter path within the switched filter
assembly.The 681XXC may or may not produce an RF output in this frequency
range.Use caution and always determine the output power level when operating
the681XXC in this condition.
Error135
Modulatoror Driver Failed Indicates a failure of the modulator in the switched filter assembly or the modulator
drivercircuitry on the A9 PCB. The 681XXC may or may not produce an RF output.
Usecaution and always determine the output power level when operating the
681XXCin this condition.
Table6-1. Self-TestError Messages (3 of 4)
OPERATOR ERROR AND WARNING/
MAINTENANCE STATUS MESSAGES