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ND-7521-1 Page 10 of 25
4.5. Manual control
The thermal image gain and offset are normally controlled automatically in order to give a
meaningful display on the screen. However, Function Key 2 offers the option of switching to
manual control if desired:
4.5.1. Press Function Key 2 to toggle to the Auto icon .
4.5.2. Press the center navigation button to toggle to Manual or Persistent
manual. If Persistent manual is selected, then the manual settings are
stored. When the camera is switched on again, and Manual selected, the
stored span and level settings are used.
4.5.3. Use the left/right navigation buttons to change the span of the displayed
temperature range.
4.5.4. Use the up/down navigation buttons to change the level of the displayed
temperature range
4.5.5. Press the center navigation button again to revert to Auto.
4.6. Light
There is a visible illuminator for use in poor ambient lighting:
4.6.1. Press Function Key 2 to toggle to the Light Off icon .
4.6.2. Press the center navigation button to toggle to Light On .
4.6.3. Press the center navigation button again to turn the light off.
It is advisable to turn the light on only when necessary in order to conserve battery power.
4.7. Image freeze
Pressing Function Key 3 freezes the both the infrared and the visible image. Pressing again
reverts to a live image. The image save facility works with either a live or a frozen image, but
once a frozen image has been saved the camera will revert to a live image.
4.8. Menu
Function Key 4 opens the menus. See section 5 for details of the menu structure.
