Campbell CR200 Instrukcja Operatora Pobierz pdf (Strona 53)

Section 4. Sensor Support

Note The accuracy specification includes only the CR200(X)’s contribution to

measurement error. It does not include the error of sensors.

For example, assume the following (see Specifications (p. 35)):

• Input Voltage: +2000 mV

• Programmed Measurement Instruction: VoltSE ()

• CR200(X) Temperature: Between -40°C and +50°C

Accuracy of the measurement is calculated as follows:

Error = Gain Error + Offset Error,

where

Gain Error = ± (2000 * 0.0025)

= ±5 mV

and

Offset Error = 1.2mV

Therefore,

Error = Gain Error + Offset Error

= ±5 mV + 1.2 mV.

= ±6.2 mV

A worst case accuracy in these conditions is

Error = ±(2000 mV * 0.01 + 2.4 mV) = ±22.4 mV

In contrast, the error for a 500 mV input under the same constraints is ±2.45 mV

typical and ±7.4 mV worst case.

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Campbell CR200 Instrukcja Operatora Strona 53