Checkline TI-007DLX, Руководство по эксплуатации

Страница: 27 / 46

– 26 –
8.0 ADDITIONAL FEATURES
8.1 Gain
The gain, or amplification of the return echoes, can be adjusted in the TI-007DLX to
accommodate a variety of materials and applications. The setting of the gain is crucial
in order to obtain valid readings during the measurement process. Too much gain may
result in erroneous measurements, detecting on noise rather than the actual material
back wall surface. Not enough gain may result in intermittent detection. If you turn it up
too much, you can’t hear the music clearly. If it’s turned down too much, you can’t hear
it at all.
The TI-007DLX has the option of using and selecting three different transducer types;
contact, delay line, and plastics. The contact and plastics types in pulse-echo (P-E) and
plastics (PLAS) modes (PLAS; “thin” setting only), use manual gain and have five gain
settings (VLOW, LOW, MED, HIGH, VHI) in 3dB increments, while the delay line style
transducers use automatic gain control (AGC), and have 3 gain settings (LOW, MED,
HIGH). The TI-007DLX has been optimized for the MED gain setting for all common
applications. It should be operated in this mode as standard. However, some applications
may require the lower or higher gain settings. When? The low settings may be necessary
for noisy or granular cast materials.
How do I know when to lower the gain? If the reading becomes sporadic and won’t
settle down or resolve on a thickness value because the material is either very noisy
or granular. Setting the gain to a lower less sensitive level, would potentially offer
improved stability. How do I know when to increase the gain? When a material is
difficult to penetrate or pass sound through. This could be due to the material type,
overall thickness, the transducer diameter and frequency, or a combination of all the
above. Turning the gain up for additional output could improve the ability to obtain
a successful measurement. In any case, the selectable gain settings offer improved
versatility to resolve and overcome potential application issues.
NOTE:
When the echo-echo (E-E) or plastics (PLAS), thick plastic setting option,
measurement modes are selected for either contact, delay line, or plastics modes,
The automatic gain control (AGC) is enabled. The dynamic range of the AGC can be
adjusted with the following options (LOW, MED, HIGH), with MED still being the
optimized standard setting as above.
The procedure for editing the gain is outlined as follows:
1. Press the key to access the menu items/features
2. Use the and keys to scroll through the menu items until the
GAIN feature is being displayed