Delmhorst Instrument HT-3000 - Manual (Page 5)

AUTO-OFF
The meter automatically switches OFF after 10 minutes without
any button activity and as long as the meter is not in HOLD
mode. If the backlight is active, the auto-off time is 35 seconds.
(see below)
BACKLIGHT
The meter is equipped with a display backlight, allowing use
under poor lighting conditions. Continued use of the back-
light presents an extra drain on the battery and significantly
reduces expected battery life.
To activate the backlight, tap the ON/OFF button. Tap the
ON/OFF button again to turn off the backlight.
LOW BATTERY
A “low battery” indication will appear on the display when
voltage is no longer sufficient. Immediately replace the bat-
tery (9V Alkaline only). Typical battery life is approximately
55 hours (without backlight).
ADJUSTING THE DISPLAY
CONTRAST
The display contrast is preset in the system memory at an opti-
mal level. Under most operating conditions, no further adjust-
ment should be necessary. However, if the meter is operated in
extreme temperature conditions, some adjustment may be
desirable for optimal viewing quality.
Procedure:
1. Ensure the meter is not in HOLD mode. Press and hold the
ON/OFF button. Keep it pressed throughout the adjustment
process.
2. To turn the display darker, press and hold the SCALE (F/C)
button within 2 seconds. Release this button when desired
contrast is achieved.
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HT-3000.qxp:FX-2000 owners manual 4/21/09 3:46 PM Page 6