Specifications

Section 4. Sensor Support
4-16
31 SE offset for ±7.5 mV input range with 60 Hz integration. ±10 LSB
32
Differential offset for ±7.5 mV input range with 60 Hz
integration.
±10 LSB
33 Gain for ±7.5 mV input range with 60 Hz integration. -0.002 mV/LSB
34 SE offset for ±2.5 mV input range with 60 Hz integration. ±20 LSB
35
Differential offset for ±2.5 mV input range with 60 Hz
integration.
±20 LSB
36 Gain for ±2.5 mV input range with 60 Hz integration. -0.00067 mV/LSB
37 SE offset for ±5000 mV input range with 50 Hz integration. ±5 LSB
38
Differential offset for ±5000 mV input range with 50 Hz
integration.
±5 LSB
39 Gain for ±5000 mV input range with 50 Hz integration. -0.67 mV/LSB
40 SE offset for ±2500 mV input range with 50 Hz integration. ±5 LSB
41
Differential offset for ±2500 mV input range with 50 Hz
integration.
±5 LSB
42 Gain for ±2500 mV input range with 50 Hz integration. -0.34 mV/LSB
43 SE offset for ±250 mV input range with 50 Hz integration. ±5 LSB
44
Differential offset for ±250 mV input range with 50 Hz
integration.
±5 LSB
45 Gain for ±250 mV input range with 50 Hz integration. -0.067 mV/LSB
46 SE offset for ±25 mV input range with 50 Hz integration. ±5 LSB
47 Differential offset for ±25 mV input range with 50 Hz integration. ±5 LSB
48 Gain for ±25 mV input range with 50 Hz integration. -0.0067 mV/LSB
49 SE offset for ±7.5 mV input range with 50 Hz integration. ±10 LSB
50
Differential offset for ±7.5 mV input range with 50 Hz
integration.
±10 LSB
51 Gain for ±7.5 mV input range with 50 Hz integration. -0.002 mV/LSB
52 SE offset for ±2.5 mV input range with 50 Hz integration. ±20 LSB
53
Differential offset for ±2.5 mV input range with 50 Hz
integration.
±20 LSB
54 Gain for ±2.5 mV input range with 50 Hz integration. -0.00067 mV/LSB
4.3 Bridge Resistance Measurements
Many sensors detect phenomena by way of change in a resistive circuit.
Thermistors, strain gages, and position potentiometers are examples.
Resistance measurements are special case voltage measurements. By
supplying a precise, known voltage to a resistive circuit, then measuring the
returning voltage, resistance can be calculated.
Five bridge measurement instructions are included in the CR1000.
FIGURE 4.3-1 shows the circuits that are typically
measured with these
instructions. In the diagrams, resistors labeled R
s
are normally the sensors and
those labeled R
f
are normally precision fixed (static) resistors. Circuits other
than those diagrammed can be measured, provided the excitation and type of