dB-difference measurement (function group dB REF) 5 Operation
USM 36 Issue 2 (12/2013) 5-39
Echo height comparison
You can compare the echo from any chosen reflector
with the reference echo.
The following values are available for indication in the
measurement line:
● dBrA
dB-difference between the reference echo and the
highest echo in the gate A.
● A%rA
Amplitude of the signal in the gate A in percent re-
ferred to the reference amplitude as 100 %.
● dBrB
dB-difference between the reference echo and the
highest echo in the gate B.
● A%rB
Amplitude of the signal in the gate B in percent re-
ferred to the reference amplitude as 100 %.
The dB-difference is independent of any pos-
sible gain variation.
– Switch to the function group EVAL on the second op-
erating level.
– Use the functions READING to choose one or sever-
al values to be indicated in the measurement line.
– Position the gate A on the echo.
– Select the function MODE and then the setting ON to
turn on the function.
The selected readings are then indicated in the mea-
surement line.
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