Apogee Instruments TS-220 Gebruikershandleiding - Pagina 13

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An excitation voltage of 2.5 V DC is recommended to minimize self-heating and current drain, while still

maintaining adequate measurement sensitivity (mV output from thermistor per C). However, other excitation

voltages can be used. Decreasing the excitation voltage will decrease self-heating and current drain but will also

decrease thermistor measurement sensitivity. Increasing the excitation voltage will increase thermistor

measurement sensitivity but will also increase self-heating and current drain.

Measurement devices (e.g., datalogger, controller) do not measure resistance directly, but determine resistance

from a half-bridge measurement, where an excitation voltage is input across the thermistor and an output voltage

is measured across the bridge resistor.

Wiring for EE08-SS

*For more information, please see the EE08-SS manual:

White: Single-ended channel (signal output by

relative humidity sensor)

Green: Single-ended channel (signal output by

air temperature sensor)

Red: Input voltage (7 to 30 V DC)

Black: Ground

Clear: Ground (shield)