Model SRV949 24 X 60 Platform Scale
Operating and Service Manual
Part No.: MAN949_170724
Page 10 of 14
S
Instruments, Inc.
,
600 Young Street, Tonawanda, NY 14150
Tel: 716-693-5977 Fax: 716-693-5854 URL:
email:
Copyright
2017
S
Instruments, Inc.
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.
CHECKING CALIBRATION
STEP 1:
Select two (2) known calibrated weights, traceable to
NIST.
NOTE:
The first weight should be at least 200 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 2:
Zero the scale by pressing and holding “
ZERO /
WEIGH
”
button.
STEP 3:
Place the first calibrated weight on the scale. Wait for scale
to stabilize; note scale reading. Remove weight.
STEP 4:
Place second calibrated weight on scale. Wait for scale to stabilize; note scale reading.
Remove weight.
STEP 5:
The scale readings for both weights should be within the Calibration Tolerance Table
plus or minus one digit of displayed resolution (Figure 4).
CALIBRATION
TOLERANCE TABLE
LOW
LIMIT
APPLIED
LOAD
HIGH
LIMIT
20.0
20.0
20.0
50.0
50.0
50.0
99.8
100.0
100.2
199.6
200.0
200.4
299.4
300.0
300.6
399.2
400.0
400.8
Figure 4: Calibration
Tolerance Table
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.