SR Instruments SR725 Operating And Service Manual - Calibration
Model SR725 Series Wheelchair Scale System
Operating and Service Manual - S/N 4068+
Part No. MAN725_100928
Page 12 of 16
SInstruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL:
www.srscales.com
email:
sri@srinstruments.com
Copyright
2010
SInstruments, Inc.
LOW
LIM IT
APPLIED
LOAD
HIGH
LIM IT
99.9
100.0
100.1
199.8
200.0
200.2
299.7
300.0
300.3
399.6
400.0
400.4
499.5
500.0
500.5
599.4
600.0
600.6
699.3
700.0
700.7
799.2
800.0
800.8
899.1
900.0
900.9
999.0
1000.0
1001.0
CALIBRATION
TOLERANCE TABLE
CALIBRATION
NOTE: Ensure that nothing is in contact with the scale system during this procedure. Remove hands
from the system when noting the displayed calibration results.
STEP 1: Remove the right-hand end-cap to access the PC Board. The calibration buttons are located
on the right side of the PC Board.
STEP 2: (Figure 9) Press and hold both buttons simultaneously
(SW5 and SW6).
STEP 3: The display will read “HOLD TO CAL” as the right hand
digit counts down to enter the CAL mode.
STEP 4: When in the CAL mode, press the “ZERO” button to zero
the display.
STEP 5: Place a known calibrated weight, traceable to NIST, onto the
weighing surface and compare it to the displayed reading. Note: DO
NOT USE barbell weights or calibrate to a mechanical scale.
STEP 6: Use the “-” or “+” button to make corrections to the
displayed weight. The displayed value should be within 0.1% of the
calibrated weight, plus or minus 1 digit of reading.
STEP 7: 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.
Figure 9: Calibration Button Diagram
IMPORTANT
CALIBRATION CHECK Qualified service personnel only should perform this procedure.
Load cells have no user serviceable components and should not be tampered with for any
reason. Re-calibration is generally not required, but should be verified periodically to ensure
accuracy. The recommendation for calibration check is at least once every 12 months, or as
individual maintenance policy requires.
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.
“-”
“+”
CALIBRATION BUTTONS