Measurement Systems MSI-3750, User Manual

Page: 116 / 146

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L
Page 116 MSI-3750 Digital Weight Indicator
◆
User Guide
TO CALIBRATE (STANDARD CALIBRATION)
Use this Calibration procedure for normal test weight calibration of the MSI
3750. If capacity or gain changes are necessary (such as an initial setup of a
system) go to the Initial Calibration Procedure.
Note: Before starting the following procedure, you must be in the Top Menu Level of
Calibration. See “Enable Calibration”.
1) Use the UP or DOWN scroll key to scroll
to the “STD CAL” message.
2) Press
ENTER
.
3) Zero Calibration – The message reads “Ø
SCALE”. Remove all weight from the scale
and wait until the scale is motionless.
The bargraph indicates relative A/D counts.
With exactly zero volts input it will indicate
50%. Readings from 10% to 60% are fine for
cal. Readings above 60% are too high and
should be corrected with Coarse Zero.
4) When the load receptor is stable push
ZERO
or
ENTER
. The display reads
“CAL’ING”. Wait for about 5 seconds. If
the detected zero weight is within accept-
able limits the message “WEIGHT” will
appear.
5) Span Calibration – The 3750 can be
calibrated with any in span test weight from
20% to 100% of capacity.Place the calibra-
tion weight on the load receptor. MSI
suggests that an ideal test weight is equal to
capacity, but any weight
≥
20% of capacity
will suffice.
The bargraph again indicates relative A/D
counts. With full scale span input the bargraph
should indicate at least 20% above the zero
reading. If this is not true, go to “Init Cal” and
change the Gain setting.
6) Next, you will need to input the exact value
of your calibration weight. Input your
calibration weight value using the numeric
keys. In this example, we show calibrating
with a Test Weight certified at 500.2 lb.
Metric Cal Example : 5 lb of dead weights are
➀
UV
F3
➠
UV
F3
➀
STD CAL
➁
ENTER
➂
Unload Scale
√
ENTER
CAL’ING
“Cal’ing” message displays while scale is zeroing (1-5s).
when zeroed:
WEIGHT
➄
Load Scale
25
SETUP
0 50 75 100
%
≈
5
MNO
5_
≈
0
SPACE
50_
≈
0
SPACE
500_
≈
F1
500._
≈
2
DEF
500.2_
25
SETUP
0 50 75 100 %