Model SR725
i
Wheelchair Scale
Operating and Service Manual
Part No. MAN725
i
_MICROBAN_200603
Page 19 of 24
S
Instruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL:
email:
Copyright 2020
S
Instruments, Inc.
CALIBRATION (Cont’d)
SETTING 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 three (3) screws on the left side cover of the display housing. Put the scale
system into the Calibration Mode by switching the calibration switch (14) on the display board
(Figure 12). “
CALIBRATION
” will flash on the display.
STEP 2:
Select two (2) known calibrated weights, traceable to NIST.
NOTE:
The first weight should be at least 500 pounds (half of the maximum scale capacity). The
second weight should be less than half of the first weight.
DO NOT USE
barbells or uncalibrated
weights.
STEP 3:
Press the
MENU
button until “
FULL = 1000.00 Lb
” is displayed. Set the
FULL
value of
the first selected calibrated weight. Use the
UP
arrow button to select the digit and the
DOWN
arrow
button to change digit. Press
ENTER
to save changes.
STEP 4:
Press the
MENU
button until “
HALF = 500.00 Lb
” is displayed. Set the
HALF
value
of the second selected calibrated weight. Use the
UP
arrow button to select the digit and the
DOWN
arrow button to change the digit.
Press
ENTER
to save changes.
STEP 5:
Press
MENU
button until “
3 Pt Calibration
” is displayed. Press the
UP
arrow button.
STEP 6:
Zero the scale by removing all weight from the platform. Press the
UP
arrow button.
STEP 7:
Place the
HALF
weight from Step 4 on platform. Allow weight to stabilize. Press
UP
arrow to save change. Remove weight.
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.
14
Continued next page
Figure 12: Display Board Calibration Switch Location