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ELECTRONICS LTD.
WEIGHT AND FREQUENCY CALIBRATION PROCEDURE FOR PLUS/SE20
2000g SCALE
1. Remove both case screws underneath the keyboard in front of the unit.
2. Use a coin to pop open the case in front of the unit to allow a small blade screw driver to move in.
Or underneath the scale there two slots which will fit a mini-screw driver for calibration job.
3.
Plug in the supplied AC adapter to power supply or put a “9V” Alkaline battery and the scale is
ready for operation.
4.
Press the key “ON/OFF” follows by “TARE” and holds momentarily.
5.
when display shows
- - - -
(minus sign) immediately press the “ON/OFF” key to enter the
calibration mode routine.
THE SCALE SHALL SHOW E.E or -80 [
USE ONLY THE SUPPLIED
ADAPTER!!!
]
Notes:-
If the scale shows calibration mode within this range as below:-
a) WITH PLATFORM MOUNTED, 200< CALIBRATION MODE< 240 or
b) WITHOUT PLATFORM MOUNTED, 90< CALIBRATION MODE < 140;
then the scale does not need any zero adjustment or offset frequency adjustment
To adjust the zero offset (claibration mode) to read within the range of . 200 to . 240
( with platform) by turning potentiometer of VAR2. (Refer to figure below)
(If more than > 240 the scale calibration mode
need to be adjusted this way and vise versa)
Legends:-
VAR1 = 500 ohm (501) multiturn variable resistor to adjust weight.
VAR2 = 10 Kohm (103) multiturn variable resistor to adjust zero or calibration mode.
5) To increase the frequency (
if scale shows wait -80
), adjust the variable resistor in the ANTI-
CLOCKWISE direction. To decrease the frequency (
if scale shows E.E
), adjust the VAR2
(variable resistor) in the CLOCKWISE direction. Please turn this VAR2 untill the reading on the
LCD shows the desired range.
6) If the calibration mode on LCD display shows:-
“. 240”, then place a standard weight of say 2000g weight on the scale’s platform and adjust now the
span by turning VAR1 to read (240+2000= .2240) on the LCD display. (refer to above figure for which
potentiometer to be used) Or use any other standard weight and adjust accordingly.
7) Remove the standard weight now, and read the calibration mode again, if it is not “. 240, please
repeat the adjustment on VAR2 again, please turn the VAR2 until the LCD display shows “. 240”
