MODEL 9DP-1 Operator’s Manual
Ludlum Measurements, Inc. 27 December 2015
Temporary: This mode automatically activates the backlight to a preset
level defined by the “Always On Level” for a user-adjustable set period
of time defined in “Temporary Display Time” any time a key is pressed
on the keypad. The default values are 100% backlit with 10-second
duration. The backlight is also activated when an alert or alarm becomes
active under this mode.
Operating Mode
“Operating Mode” represents the current operating mode for the backlight.
“Operating Mode” is a special field with valid values of “Off,” “On,” “Auto,”
and “Temporary” as described in section 6.3.1.1.
Temporary Display Time
“Temporary Display Time” represents the length that the backlight will remain
on in seconds when the instrument backlight is operating in “Temporary” mode.
The display time is a numeric field.
Always On Level
“Always On Level” represents the backlight level that the backlight will operate at
when the instrument backlight is operating in the “On” mode or the
“Temporary” mode, assuming that a key has been pressed. “Always On Level” is
a numeric field displayed in percentage.
Auto Mode Settings
“Auto Mode Settings” is a sub-menu allowing access to the low, medium, and
high backlight level settings.
When the backlight is operating in “Auto” mode, the backlight can adjust to three
separate levels, depending on the amount of light detected by the instruments
light sensor.
Low Level Backlight
“Low Level Backlight” represents the percentage level for the backlight when
the instrument detects the maximum amount of ambient light. The low-level
backlight is a numeric field displayed in percentage with a default value of
20%.
Medium Level Backlight
“Medium Level Backlight” represents the percentage level for the backlight
when the instrument detects an average amount of ambient light. The
medium level backlight is a numeric field displayed in percentage with a
default value of 60%.