NF FRA5087, Инструкция по эксплуатации

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3.2 Display at power “ON” and initial settings
FRA5087 3-11
Calibration/Systemcheck
Calibrating . .
oooooooooo*************************************
FRA5087 System program
Version *.**
Copyright 1989..2006 NF Corporation
The completion of calibration is indicated by the change of “*” marks into all “o” marks in the
“Calibration/Systemcheck” window display, which means that the instrument is ready for
operation
The setting values and parameters just before the previous power-off are maintained, except that
the oscillator output is off and the measurement is inactive.
If any errors are detected during calibration processes, the word “ERROR” will be displayed in
red characters (see the arrow
 the figure) in the “Calibration/Systemcheck” window, and the
FRA5087
does not function/operate.
Calibration/Systemcheck
Calibrating . .
oooooooooo*************************************
ERROR : 50
･･････････････
FRA5087 System program
Version *.**
Copyright 1989..2006 NF Corporation
The following are possible causes of calibration errors as mentioned above:

Effect of external noise
During calibration processes, measurement is made within the instrument by connecting the
oscillator output and the analyzer input internally. A calibration error could be caused if a
high level of external noise comes in at any time during the internal measurement. If the
calibration error exceeds a certain predetermined range (threshold), an error message will be
displayed and the instrument will be put in an inoperable status, since the measurement
accuracy cannot be maintained.
(Actions/measures to be taken)
・
Use the instrument in a low noise environment.
・
Switch on the power supply again after disconnecting a signal cable with BNC
connectors from the oscillator output and the analyzer input. This can isolate the
noise source if noise has been induced in the signal cable.

Failure of FRA5087
If a calibration error is indicated even after the above measures, malfunction of the FRA5087
is suspected. Contact NF Corporation or its representative to arrange for repair.
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