Vaisala DMP248, Operating Manual

Page: 69 / 141

C
HAPTER
6 ______________________________________________
CALIBRATION
AND ADJUSTMENT
V
AISALA
_________________________________________________________________________ 65
•
the LED on the left flashes; set the low end of channel 2 with the
arrow keys and press ENT
•
the second LED from the left flashes; set the high end of channel 2
with the arrow keys and press ENT
The analogue outputs are calibrated to ensure that outputs are
correctly scaled: for example, when the output is scaled to 4...20 mA,
the low end of the scale is 4 mA and high end 20 mA exactly.
However, when 0... 20 mA output is used, the output can not be
adjusted to exactly 0 mA, but to 50 µA. When 0...1 V, 0...5 V or 0...10
V output is in use, the output is adjusted to 50 mV. The following
table summarizes the correct output values.
T
ABLE
6-2
Summary of the correct output values
Output scale:
0...20 mA
4...20 mA 0...1 V 0...5 V 0...10 V
low end: 50 µA 4 mA 50 mV 50 mV 50 mV
high end: 20 mA 20 mA 1 V 5 V 10 V
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