Vaisala WMT700 - Manual (Page 54)

User's Guide ______________________________________________________________________
Analog Output Scaling
You can specify the transfer function between measured values
and output analog values. You can select the analog output type
as well as the gain and offset used in the transfer function. For
information on the parameters, see Appendix D, Configuration
Parameters, on page 205.
Table 19 below shows the factory default settings for the different
analog output modes.
Table 18 Factory Settings for Analog Wind Speed Output
AOUT1
Selected Option Scaling/Gain Offset Error
Indication Example
Voltage 0.1 V / m/s 0 V 10 V 0 V = 0 m/s
7.5 V = 75 m/s
Current 0 ... 20 mA 0.0002 A / m/s 0 A 0.022 A 0 mA = 0 m/s
15 mA = 75 m/s
Current
4 ... 20 mA WMT701 0.00040000 A / m/s 0.004 A 0.002 A 4 mA = 0 m/s
20 mA = 40 m/s
WMT702 0.00024615 A / m/s 0.004 A 0.002 A 4 mA = 0 m/s
20 mA = 65 m/s
WMT703 0.00021333 A / m/s 0.004 A 0.002 A 4 mA = 0 m/s
20 mA = 75 m/s
Frequency Push-Pull 10 Hz / m/s 0 Hz 1000 Hz 0 Hz = 0 m/s
750 Hz = 75 m/s
WS425 - voltage 8 mV / mph
(0.017895 V / m/s) 0 mph 2 V 0 mV = 0 mph
1.344 V=168 mph
WS425 - frequency 5 Hz / mph
(11.185 Hz / m/s) 0 mph 1000 Hz 0 Hz = 0 mph
840 Hz =168 mph
Frequency Push
(PNP) 10 Hz / m/s 0 Hz 1000 Hz 0 Hz = 0 m/s
750 Hz = 75 m/s
Frequency Pull (NPN) 10 Hz / m/s 0 Hz 1000 Hz 0 Hz = 0 m/s
750 Hz = 75 m/s
Table 19 Factory Default Settings for Analog Wind
Direction Output
AOUT2 Selected
Option Scaling/Gain Offset Error
Indication Example
Voltage 0.02 V / ° 0 V 10 V 0 V = 0°
7.2 V = 360°
Current 0 … 20 mA 0.00005 A / ° 0 A 0.022 A 0 mA = 0°
18 mA = 360°
Current 4 … 20 mA 000044444 A / ° 0.004 A 0.002 A 4 mA = 0°
20 mA = 360°
Potentiometer
(WS425) 1/359*V
ref
/ °
(0.0027855)
0 Vref
(1) 0 V = 0°
Vref = 359°
For a different scaling, change the gain and offset settings, see
Configuration Parameters on page 118.
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