Vaisala HMP240 - Manual (Page 57)

HMP240 series
M210300en User's Guide
55
• Enter the measured upper end current/voltage on channel 2.
6.3.3 With LED commands
If both the analogue outputs and humidity/temperature channels are calibrated,
the analogue outputs should be calibrated first. This applies only when the
calibrations are done with LED commands!
• connect an ammeter/voltmeter to the analogue outputs (connector X2)
Disconnect the security lock jumper!
• Give command ¡¡ll.
• the LED on the left flashes; set the low end of channel 1 with the ar-
row keys and press ENT
• the second LED from the left flashes; set the high end of channel 1
with the arrow keys and press ENT
• the LED on the left flashes; set the low end of channel 2 with the ar-
row 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 the correct scaling: 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.
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