Laurel Electronics LAUREATE SERIES SCALE-WEIGHT METER User Manual
Page 16
16
13. SCALE METER SETUP
When the Reading Coordinates of 2 Points scaling method has been selected under
SEtuP
,
the four menu items below will appear ahead of all other menu items when the MENU or
key is first pressed from the run mode.
This scaling method applies a straight line fit between two points, which are determined
from actual transducer signals and the desired corresponding meter readings. A low signal,
such as the output of a load cell at zero weight, and a high signal, such as the output of the
same load cell at a known high weight, are applied to the meter. The desired corresponding
low and high readings are then entered from the front panel. The meter then applies straight
line fit between the high and low calibration points. This scaling method has the advantage
of calibrating the transducer and meter as a system. The actual voltage or current at either
point does not need to be known. This method is ideal for process and load cell scale
meters, which require zero and span adjustment.
The programming example below is for a scale meter used with a 4-20 mA load cell trans-
ducer for 0 to 100 lbs. Decimal points are set separately using the dEC.Pt menu.
Press Menu Select
Key
Press Digit Select
Key
Press Value Select
Key
Lo In
Apply low signal input
(e.g., transducer output for 0
psi).
_
40.21
Press to display
reading at low signal input
(e.g., 4.021 mA).
_
40.21
Press to store low
reading.
Hi In
Apply high signal input
(e.g., transducer output for
known 100.00 psi source).
200.94
Press to display
reading at high signal input
(e.g., 20.094 mA).
200.94
Press to store high
reading.
Lo rd
Mode to enter desired low
reading (e.g., 0.00).
000.00 000.00 000.00
000.00 000.00
Select digit
to flash.
10
0.00
Select
-9
thru
9
for
flashing first digit,
0
thru
9
for
other flashing digits.
Hi rd
Mode to enter desired high
reading (e.g., 100.00).
000.00 000.00 000.00
000.00 000.00
Select digit
to flash.
100.00
Select
-9
thru
9
for
flashing first digit,
0
thru
9
for
other flashing digits.