GAS DETECTIR SERIES USER MANUAL
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8-10 Level & Span
To the right of the imaging interface is the Level & Span bar which plots the
surface temperature information detected by the system. The maximum
temperature is displayed on the top and the minimum temperature on the bottom.
These numbers change depending on the physics of the scene. Preferably, the
temperatures detected by the thermal device falls between the maximum and
minimum temperature detected. If a number falls outside this range the image
may “wash out”, i.e. the extraneous energy in the viewing environment may
reduce the perceived contrast of the image. Adjust the gain control numbers to
improve contrast.
8-10-1 Auto Gain Control (AGC)
The Auto Gain Control (AGC) function is enabled by default and automatically
assists users in fine-tuning image contrast. Switching to manual mode allows the
user to further adjust the contrast settings.
Press and hold; then, release the A Key to switch between automatic and
manual mode.
TO RESET THE GAIN CONTROLS, PRESS AND HOLD; THEN, RELEASE THE
A KEY TO SWITCH FROM MANUAL MODE TO AUTOMATIC MODE. AFTER
SWITCHING TO AUTOMATIC MODE THE CONTRAST WILL BE RESET.
8-9
Digital Zoom
The imager offers digital zoom in automatic and manual modes. When zoomed
in or zoomed out, the zoom factor displays in the upper middle portion of the
screen; 1x to 8x digital zoom is available.
•
In manual mode, press the F3 Key on the device to zoom in. Press and
hold; then release the F3 Key to zoom out.
•
In automatic mode, press either ◄ or ► on the directional pad to adjust
the digital zoom.
8-8
Non-uniformity Correction
Non-uniformity correction (NUC) is used to compensate for the non-uniformity
of detector pixels or other optical interference. The infrared device features
an automatic NUC operation. Press the A button to perform a manual NUC
operation. When performing a correction operation, the user will hear a click
from the device and the image will freeze temporarily. The image may clear of
some noise grain after the device makes its adjustments.
