JRC JMA-9922-6XA Instruction Manual page 164

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(Example)
Assuming that the initial bar indication is B = 8 and the current bar indication A = 6, the relative
attenuation is d(B) = 3.5 dB, d(A) = 7 dB. Thus, d(A) - d(B) = 3.5dB.
This clearly indicates that the current transmission output power is attenuated by approximately 3.5
dB.
Example of Checking Transmitter System
Current bar indication A=6
３
Initial bar indication B=8
Calibration Curve I
Measurement precision
Length of Bar Indicator l
Figure 2
3-92