Vaisala WINDCAP WS425 Uživatelská příručka stáhnout pdf (Strana 55)

Chapter 3 _______________________________________________________ Functional Description

NOTE

The scaling of the current output 4…20 mA depends on the sensor

measurement range (WMT701, WMT702, or WMT703), while the

0…20 mA output has 0.2 mA / m/s scaling for all the measurement

ranges.

Table 20 and Table 21 below list the most common settings for

different units.

Table 20 Common Transfer Function Settings for

AOUT1 (WS)

Output Signal

Scaling/Units

Setting for Gain

Setting for Offset

Voltage

8 mV / mph

100 mV / m/s

0.017895

0.1

Current

0.2 mA / m/s

0.0002

Frequency

5 Hz / mph

10 Hz / m/s

11.185

WS425 - voltage

8 mV / mph

0.017895

WS425 - frequency

5 Hz / mph

11.185

Table 21 Common Transfer Function Settings for

AOUT2 (WD)

Output Signal

Scaling/Units

Setting for Gain

Setting for Offset

Voltage

4 mV / °

20 mV / °

0.004

0.02

Current

50 uA / degree

0.00005

Potentiometer

359° = Aout ref

0.0027855

You can configure output scaling or transfer function settings in a

variety of ways by changing the custom gain and offset. The basic

measurement units are m/s and degrees. The physical output units

are V, A, and Hz. For the potentiometer, an output of 1 means

100% of the Aout ref voltage.

The following formula illustrates the impact of gain and offset

values on the produced output:

o = y0 + k×s

where

Produced analog output (V, A, Hz, 100%)

Measured wind speed or direction (in m/s or °)

Selected gain value

Selected offset value

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