Vaisala DMT143 - Manual (Page 46)

USER'S GUIDE ____________________________________________________________________
44 ___________________________________________________________________ M211435EN-E
Extend Analog Output Range
Use the AOVER command to allow the analog output channels to
exceed their specified range by 10%. The scaling of the parameter
remains as before; the extra range is used for additional measurement
range in the high end of the scale.
AOVER [ON/OFF]
Example (turning AOVER on):
aover on
AOVER : ON
The following example illustrates how the analog output is affected. The
channel outputs T
d
with voltage output 0 … 5 V (-80 … -30 °C). After
giving the AOVER ON command, the range is 0 … 5.5 V
(-80 … -25 °C). Note that the -30 °C T
d
point is still at 5 V.
Test Analog Output
You can test the operation of the analog output with the ATEST
command by forcing the output to a given value. You can then measure
the output with a calibrated multimeter. After testing the output, give the
ATEST command again to exit the test mode.
ATEST [level]
where
level = Level for analog output channel.
Analog output type determines if the value is V or mA.
The command output shows the test value of the analog output as well as
diagnostic information that may be useful to Vaisala Service if there is a
problem with the analog output.
Example (enabling analog output test mode, setting level to 20 mA):
atest 20
20.000 27407
Example (disabling analog output test mode, resuming normal output):
atest
0.000 15831