Vaisala GMW90 - Manual (Page 47)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 45
Set Output Clipping and Error Limit
Use the AOVER command to define the behavior of the analog outputs
when the measured value is outside the scaled output range.
AOVER [channel clip% valid%]<cr>
where
channel = Analog output channel, 1 ... 3.
clip% = Output margin (%) at which the output is clipped.
Range 0 ... 20, default is 0.
valid% = Output margin (%) at which the output of the channel
goes into the error state. Range 0 ... 20. Default is 5 for
humidity and temperature, 0 for carbon dioxide.
The error state is defined using the AMODE command,
see section Set Analog Output Mode on page 43.
NOTE These settings have no effect on the measurements shown on the display.
The display will always show the currently measured values, even
outside the scaled output range, as long as the measurement is still
functioning.
For example, first check the analog output settings using ASEL,
AMODE, and AOVER commands:
>pass 9000
>asel
Aout 1 quantity : T (-5.00 ... 55.00 'C)
Aout 2 quantity : RH (0.00 ... 100.00 %)
Aout 3 quantity : CO2 (0.00 ... 2000.00 ppm)
>amode
Aout 1 range ( V) : 0.00 ... 5.00 (error: 5.50)
Aout 2 range ( V) : 0.00 ... 5.00 (error: 5.50)
Aout 3 range ( V) : 0.00 ... 5.00 (error: 5.50)
>aover
Aout 1 clipping : 0.00 %
Aout 1 error limit : 5.00 %
Aout 2 clipping : 0.00 %
Aout 2 error limit : 5.00 %
Aout 3 clipping : 0.00 %
Aout 3 error limit : 0.00 %
The parameter for channel 3 is CO2, with standard output range 0 ... 5 V
and scaling 0 ... 2000 ppm. Error state is 5.5 V, which is set immediately
when the measured value is outside the scaled output range.