Model SR255 Daily-Weigh
™
Scale
Operating and Service Manual - S/N 3616+
Part No. MAN255_110921
Page 18 of 22
S
Instruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL:
www.srscales.com
email:
Copyright 2011
S
Instruments, Inc.
Continued next page
CALIBRATION Cont’d
STEP 4
: System offset is displayed on the right side of the screen and should read b35
and +40 pounds. Use a fine blade screwdriver to adjust Offset Potentiometer (R13).
STEP 5:
When in CAL mode, press the “
ZERO
” button to zero the display.
STEP 6
: Center a known calibrated weight, traceable to NIST, on the stretcher and compare to
display reading.
STEP 7
: Adjust the reading, using the “+” or “-” buttons to match the weight. Display should be
within 0.1% of the calibrated weight. See Calibration Tolerance Table.
STEP 8
: Remove the weight and re-zero. Repeat steps 5, 6, and 7 until correct.
STEP 9
: When settings are completed: Press the “
HOLD
” button to SAVE the settings or press
the “
WEIGH
” button to CANCEL. Both choices will EXIT the CAL mode.
INITIALIZATION
Figure 17: Location of Internal Initialization Buttons
INITIALIZATION PROCEDURE
To be used ONLY IF REPLACING IC5 or if DISPLAY READS DOUBLE
Internal Initialization Buttons
SW2
SW5
CAUTION
The integrated circuits and semiconductors on
the printed circuit boards may be damaged by
electrostatic discharge (ESD). Be sure to use
proper handling precautions at all times.
