10.6 Time-Dependent Gain Curve; Figure 10-7 Comparing Pulser Powers Set To 60 V And 200 V - Olympus 45MG User Manual

DMTA-10022-01EN, Rev. C, January 2015
Initial pulse
Initial pulse

Figure 10-7 Comparing pulser powers set to 60 V and 200 V

NOTE
When the 45MG displays the SAT flag below the thickness reading, the input voltage
from the transducer is above the maximum range, and proper measurements cannot
be made. This can normally be corrected by lowering the PULSER POWER until the
SAT flag no longer appears.

10.6 Time-Dependent Gain Curve

With single element transducers, the 45MG either uses the automatic gain control
(AGC) [see "Configuring Measurement Parameters" on page 141 for details on how to
activate the AGC] or the time-dependent gain (TDG) functions to automatically adjust
receiver gain to an optimum level when an echo is detected.
The 45MG offers three parameters for drawing a time-dependent gain curve: INIT
GAIN, TDG SLOPE, and MAX GAIN (see Figure 10-8 on page 174). From the initial
gain level, receiver gain slopes up to the maximum gain level at the rate determined
by the TDG SLOPE setting. When you adjust any of the received gain parameters, a
black time-dependent gain curve is displayed that clearly indicates the zones of initial
gain, slope, and maximum gain.
Custom Setups for Single Element Transducers 173