Scaling Without Known Loads - Omega DP25B-S User Manual

4
Configuring The Meter

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:
Determine the correct values for IN1 and IN!2 based on the load cell specifications.
1.
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:
Determine the multiplier by the Input Resolution setting (R.2 in the RD.CF menu)
2.
and the input range selected. Typically R.2=4 is suitable for most applications.
Input Range
0 to 100 mV
0 to 10 V
0 to 20 mA
± 50 mV
± 5 V
26
Maximum Load:
Output:
Sensor Excitation: 10 Vdc
Output:
IN = (Sensor Output) x (Natural Gain) x (Multiplier).
Table 4-3. Natural Gain
Input Range
0 to 100 mV
±50 mV
0 to 10 V
± 5 V
0 to 20 mA
Table 4-4. Input Resolution Multiplier
R.2=4
1.000
1.000
1.000
1.000
1.000
100.0 lbs
3.1 mV/V
31mV = (3.1 mV/V) x (10 V)
Span Units
Millivolts
Millivolts
Volts
Volts
Milliamps
R.2=3 R.2=2
2.000 3.333
2.000 3.333
2.000 3.333
1.000 1.667
1.000 1.667
Natural Gain
100 cts/mV
40 cts/mV
1000 cts/V
400 cts/V
500 cts/mA
R.2=1 R.2=0
5.000 10.00
5.000 10.00
5.000 10.00
2.500 5.000
2.500 5.000