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4
Configuring The Meter
26
4.3.2 Scaling Without Known Loads
To scale without known inputs, calculate input values based on the transducer
specifications and manually enter them on the front-panel push buttons. The following
example assumes load cells with these specifications:
Maximum Load:
100.0 lbs
Output:
3.1 mV/V
Sensor Excitation:
10 Vdc
Output:
31mV = (3.1 mV/V) x (10 V)
1.
Determine the correct values for
IN1
and
IN!2
based on the load cell specifications.
In most cases,
RD1
and
RD!2
are equal to the minimum and maximum of the
transducer output span. The example assumes
RD1
and
RD!2
are equal to the
range of the load (
RD1
= 0 and
RD!2
= 100.0). Calculate
IN1
and
IN!2
using the
loadcell output span and the following equation:
IN
= (Sensor Output) x (Natural Gain) x (Multiplier).
Table 4-3. Natural Gain
2.
Determine the multiplier by the Input Resolution setting (
R.2
in the
RD.CF
menu)
and the input range selected. Typically
R.2=4
is suitable for most applications.
Table 4-4. Input Resolution Multiplier
Input Range
R.2=4
R.2=3
R.2=2
R.2=1
R.2=0
0 to 100 mV
1.000
2.000
3.333
5.000
10.00
0 to 10 V
1.000
2.000
3.333
5.000
10.00
0 to 20 mA
1.000
2.000
3.333
5.000
10.00
± 50 mV
1.000
1.000
1.667
2.500
5.000
± 5 V
1.000
1.000
1.667
2.500
5.000
Input Range
Span Units
Natural Gain
0 to 100 mV
Millivolts
100 cts/mV
±50 mV
Millivolts
40 cts/mV
0 to 10 V
Volts
1000 cts/V
± 5 V
Volts
400 cts/V
0 to 20 mA
Milliamps
500 cts/mA
Summary of Contents for DP25B-S
Page 10: ...Notes viii...