Chapter 3: Displaying Data; Introduction; Adjusting Lcd Contrast And Brightness - GE AquaTrans AT868 User Manual

Introduction

Adjusting LCD Contrast
and Brightness
Displaying Data
The Model AT868 flow transmitter is equipped with a Liquid Crystal
Display (LCD), it may be programmed to display up to four variables
in sequence. To ease viewing, both the brightness and the contrast of
the LCD may be adjusted. In addition, this section discusses resetting
totalizers and pausing the measurement.
Both the contrast and the brightness of the LCD may be adjusted to
suit individual needs. The Model AT868 has two adjustment
potentiometers located on the LCD circuit board (see Figure 3-1
below). To make LCD adjustments, complete the following steps:
1. Loosen the six set screws to remove the front cover.
2. With power still applied to the meter, carefully use a small
screwdriver to adjust the LCD brightness. Turning the BKLT
(backlight) pot fully clockwise yields maximum brightness.
3. In a similar manner, adjust the CONT (contrast) pot to set the LCD
contrast as desired. At either extreme of the CONT pot, the display
is unreadable. Turn the pot fully counterclockwise and then turn it
clockwise very slowly until the display is clear.
4. Readjust the BKLT control as desired.
5. Replace the front cover on the AT868, and secure it in place with
the set screws.
Figure 3-1: Location of CONT and BKLT Potentiometers
September 2004
CONT Potentiometer
BKLT
Potentiometer
3-1