Vaisala HUMICAP DMT132 Guía de usuario descargar pdf (Pagina 60)

USER'S GUIDE____________________________________________________________________

58 __________________________________________________________________ M211289EN-A

Temperature Calibration and Adjustment

(CT)

The procedure below describes a temperature (T) measurement

calibration and adjustment using serial line commands. You can use the

procedure to do a one-point calibration (offset) or a two-point calibration

(offset and gain). For two-point calibration, the second reference point

must be at least 20

ºC warmer than the first.

1. Disconnect the cable from connector I of the DMT132 (if

connected).

2. Connect the USB cable to connector II on the DMT132, and to a

USB port on your PC.

3. Start a terminal application and set the service port connection

settings (

19200 8 N 1). Remember to check which COM port the

USB cable is using.

4. Verify that the connection works by giving the

? command:

If the transmitter does not respond with device information:

- Check your serial line settings and cable connections

- Reconnect the USB cable, restart the terminal application, and

try again.

5. When your serial connection is working, use the

L command to see

the current user adjustment parameters. Write down the T offset

and gain values so you can restore them manually using the

command, if necessary.

6. Use the

ERRS command to see that no errors are active:

>errs

7. Insert the transmitter in the temperature reference.

8. Give the

CT command. The output from the command shows the

currently measured T value, and prompts you to enter the value of

the first reference (Ref1). This is the reference on the colder end,

which produces the offset correction for the measurement.

>ct

T 21.0947 Ref1 ?

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Vaisala HUMICAP DMT132 Guía de usuario Pagina 60