Zero Offset Selection
(for mv/v, divide by 10)
SW2
pos 5
SW2
pos 4
SW2
pos 3
SW2
pos 2
SW2
pos 1
35 mv Zero Down
0
1
1
1
1
30 mv Zero Down
0
1
1
0
1
25 mv Zero Down
0
1
0
1
1
20 mv Zero Down
0
1
0
0
1
15 mv Zero Down
0
0
1
1
0
10 mv Zero Down
0
0
1
0
0
5 mv Zero Down
0
0
0
1
0
0 mv Zero Down/Up
0
0
0
0
0
5 mv Zero Up
1
0
1
0
1
10 mv Zero Up
1
0
0
1
1
15 mv Zero Up
1
0
0
0
1
*Note : 1 = Closed Switch, 0 = Open Switch.
ANALOG SPAN CALIBRATION
The analog span calibration is the full scale span or gain for the platform being used. The
span switch settings should be set so that when 100% of the scale's capacity is applied to
the platform, the raw count reading should change approximately 40000 to 60000 counts
from the zero reading obtained from the analog zero calibration. If the span is above or
below this range, use the chart on the following page to adjust the switch settings so that
the span falls into the acceptable range. The raw counts are limited to 104000, so when
setting the span, be sure that the absolute raw count reading stays below 104000 counts.
Use the following formulas to determine the SPAN and Full Capacity readings:
SPAN
= (
RAWHI
−
RAWLO
) ∗
CAPACITY
TESTWEIGHT
RAWFC
=
RAWLO
+
SPAN
RAWHI is the reading with the test weight on the platform, RAWLO is the reading with the
platform empty. SPAN is the full capacity span, which should be between 40,000 and
60,000 counts, and RAWFC is the full capacity reading, which shouldn't go above 104,000
counts.
After adjusting the span, recheck the zero calibration and adjust again if necessary.
Proceed with the digital calibration.
Section 7 Calibration
48