Automatic Gain Control (Auto Gain Control) - GE USM 36 Series Technical Reference And Operating Manual

General setup

Automatic gain control (Auto Gain Control)

You can use the functions of the column Auto Gain Ctrl
to turn on and to configure the automatic gain control of
the USM 36.
Even smaller variations of the echo amplitude can lead
to incorrect measurement results in wall thickness mea-
surements. In these cases, the exact monitoring of the
amplitude is therefore highly important. The automatic
gain control of the USM 36 offers practical help for this
purpose.
USM 36
The automatic gain control of the USM 36 keeps the
echo amplitude fully automatically at a specified screen
height and, in this way, compensates for the amplitude
variations of the signal received. This enables to clearly
improve especially the wall thickness measurement and
to make it easier.
To configure the automatic gain control, enter the mini-
mum and the maximum height of amplitude in percent
screen height that the echo signal should reach within
the gate.
In addition, you can define a threshold for the noise. Sig-
nals below this threshold are not taken into account for
the automatic gain control.
N o t e
The smaller the ratio between the values
MIN AMP.% and MAX AMP.%, the more
sensitive the control process.
Issue 2 (12/2013)
5 Operation
5-85