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Zero Offset
For accurate measurements it may be necessary to set the point at which zero light
is displayed. This is achieved by blocking off all light to the detector and then zeroing
the meter.
To set the zero point, press menu, scroll down to zero, press enter. Message, “Set
zero light level?” appears. Ensure that the detector optical input port is totally
blocked by an opaque object which is at room temperature, or all light is prevented
from entering the detector by some means. To avoid damage or injury ensure any
powerful optical source is switched off. Do not use a finger as some detectors will
detect the infra-red from the finger. When ready, press Enter. The zero value on the
meter is now set to the level corresponding to darkness.
The display then returns to the main display and the obstruction at the detector port
can now be removed.
Backlight
To turn the backlight on or off, press the backlight button (refer to the keypad
diagram).
To set the backlight brightness, press menu, scroll down to Display, press enter.
Backlight is already selected, so press Enter. The message ‘Backlight on’ and the
current brightness percentage appears. Use the up arrow (8) and down arrow(2)
buttons to adjust the brightness from 10% (dim) to 100% (bright). Press Enter when
done. The display returns to the main display.
Note that if running the unit from the battery pack, the battery life will be reduced
depending on how much the backlight is used and how brightly it is set.
Display Contrast
To set the display contrast, press Menu, scroll down to Display, press Enter. Scroll
down to Contrast, press Enter. The current contrast level is displayed. Use the
up/down buttons to change the contrast for best viewing. Press enter when done.
The display returns to main display.
