Vaisala DEWCAP DM500 Guide de l'utilisateur télécharger pdf (Page 78)

User's Guide ______________________________________________________________________

76 __________________________________________________________________ M210205EN-D

The port connections are as follows:

pin 1: ch+ (+VDC supply voltage)

pin 2: ch- (-VDC supply voltage)

pin 3: test (for service use only)

pin 4: shield

When using 12V loop voltage, the resistance must be less than 90

ohms. An approximate can be calculated by following formula:

Rmax = (V

loop

- 10V)/20mA

You can scale the output to any output range. It is recommended to

have the scaling within the measuring range to get accurate

measurements.

1. Connect the analog output signal cable connector to the

connector, see Figure 21 on page 73.

2. Open MENU: press .

3. Select ►Interfaces, press .

4. Select ►Analog outputs, press .

5. Select ►Output 1, press .

6. Select Quantity, press SET , select the quantity for the analog

output and press SELECT.

7. Select Scale 4 mA, press SET.

8. Press CLEAR and give the lowest value (value represented by 4

mA current) by using numerical buttons. Press OK.

9. Select Scale ...20 mA, press SET.

10. Press

CLEAR and give the highest value (value represented by

20 mA current) by using numerical buttons. Press OK.

11. Select ENABLED WHEN, press SELECT. Now you can select the

measurement status that activates the analog outputs.

STOP: output is enabled when dewpoint measuring status is

STOP.

ERR: output is enabled when dewpoint measuring status is

ERR.

OK: output is enabled when dewpoint measuring status is OK

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Vaisala DEWCAP DM500 Guide de l'utilisateur Page 78