Vaisala HMP243 Guia do Utilizador descarregar pdf (Página 57)

HMP240 series

M210300en User's Guide

• 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

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 129 130

Sem comentários

Vaisala HMP243 Guia do Utilizador Página 57