Echo Height Comparison - GE USM 36 Series Technical Reference And Operating Manual

dB-difference measurement (function group dB REF)

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 %.
N o t e
The dB-difference is independent of any pos-
sible gain variation.
USM 36
– 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.
Issue 2 (12/2013)
5 Operation
5-39