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27
Configuring The Meter 4
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 pushbuttons. The following
example assumes a pressure transducer with these specifications:
Pressure Range: 0 to 2000 PSI
Output Span: 1 to 5 Vdc
1. Determine the correct values for IN1 and IN!2 based on the transducer
specifications. In most cases, RD1 &RD!2 are equal to the minimum and
maximum of the transducer output span. The example assumes RD1 & RD!2 are
equal to the pressure range of the transducer (RD1 = 0000 and RD!2 = 2000).
Calculate IN1 and IN!2 using the transducer 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
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