Olympus 38DL PLUS User Manual

DMTA-10004-01EN, Rev. D, November 2016
Chapter 13 230
Figure 13‑8 The TDG zones and parameters
You can use the TDG curve to optimize near-surface resolution while providing a
higher maximum gain for thicker samples. You can also use the TDG curve in
measurements of highly scattering materials, such as cast metals and fiberglass, to
minimize detection of scattered echoes occurring ahead of the back-wall echo.
13.6.1 Maximum Gain
The maximum gain indicates the maximum (time-dependent) receiver gain possible.
The maximum gain is used to amplify echoes that are further out in time. In general
for a given application, you should set the maximum gain high enough so that all
echoes of interest are detected.
You can adjust the maximum available receiver gain from 0.0 dB to 99.0 dB. When no
echo is detected (LOS prompt), the gain rises to the maximum level set by the initial
gain, slope, and maximum gain. When the maximum gain is set too high, the gage
may hang up on transducer noise or other spurious signals; when it is set too low,
returning echoes may not be high enough for detection.
Time-dependent gain
curve
INIT GAIN level zone
MB BLANK
MAX GAIN
level zone
TDG SLOPE zone

Olympus 38DL PLUS Specifications

General

Operating Temperature	-10 °C to 50 °C (14 °F to 122 °F)
Data Logger	Yes
Interface	USB, RS-232
Thickness Range	0.08 mm to 635 mm (0.003 in. to 25 in.) depending on material and transducer
Display	Backlit LCD
Battery Type	Three alkaline or NiMH AA cells
Pulser	Adjustable square wave pulser
Receiver Bandwidth	0.5 MHz to 20 MHz
Languages	English, French, German, Spanish, Italian, Russian, Japanese, Chinese
Resolution	0.001 mm or 0.0001 in.
Transducer Frequency	2 MHz to 30 MHz
Material	Plastic housing