JRC JMA-9922-6XA Instruction Manual page 163

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Checking procedure
①
②
③
３
④
Read a current value A on the bar indicator.
Referring to the Calibration Curve I, obtain a relative attenuation d(B) for the initial bar
indicator length B that is specified in the INFORMATION LABEL.
Then, obtain a relative attenuation d(A) for the value A referring to the Calibration Curve I.
The value given by d(A) - d(B) represents the attenuation of the current transmission
output power compared with the value at the initial time.
If the attenuation value given by d(A) - d(B) is 10 dB or more (due to the life of the
magnetron), it is necessary to request for checking of the transmitter system by a service
engineer.
Calibration Curve I
Length of Bar Indicator l
Date and time of
initial setting
Figure 1
3-91
Initial bar
length
Maximum range
pattern
Measurement precision