Campbell CR800 Series, Operator'S Manual

Page: 368 / 598

Section 8. Operation
368
FIGURE 84: Example voltage measurement accuracy band, including
the effects of percent of reading and offset, for a differential
measurement with input reversal at a temperature between 0 to 40
°C.
Measurement Accuracy Example
The following example illustrates the effect percent-of-reading and offset have on
measurement accuracy. The effect of offset is usually negligible on large signals:
Example:
•
Sensor- signal voltage: ≈2500 mV
• CRBasic measurement instruction: VoltDiff()
•
Programmed input-voltage range ( Range ): mV2500 (±2500 mV)
• Input measurement reversal ( RevDiff ): True
• CR800 circuitry temperature: 10 °C
Accuracy of the measurement is calculated as follows:
accuracy = percent -of-r offset