Vaisala HMP60 Betriebsanweisung PDF herunterladen (Seite 53)

Chapter 5 ______________________________________________________________ Maintenance

VAISALA _______________________________________________________________________ 51

6. Verify that the connection works by giving the ? command:

If the probe does not respond with device information:

- Disconnect the USB cable from the probe and retry. If your

probe is in the analog output mode, press Enter a few times

immediately after connecting the USB cable.

- Try the ?? command in case the probe is in POLL mode, open

the line using OPEN command if necessary.

- Check your serial line settings and cable connections.

7. When your serial connection is working, use the L command to see

the current user adjustment parameters.

8. Use the ERRS command to see that no errors are active:

errs

9. Use the SEND command to verify the currently measured RH

value:

send

T= 22.9 'C RH= 11.1 %RH Td= -8.0 'C

10. Give the CRH command with the RH value of the humidity

reference as a parameter:

crh 11

11. After entering the correction, unplug the USB cable from the probe.

Insert the probe in the NaCl salt chamber (75 %RH) and wait for

20 – 40 minutes for humidity and temperature to stabilize.

12. Connect the USB cable to the probe and use the SEND command

to see the currently measured value.

13. Give the CRH command with the RH value of the humidity

reference as a parameter:

crh 75

14. Check with the L command that the user adjustment parameters

have changed.

If you wish to remove the effects of RH calibration (returning the

RH measurement of the HMP110 to the factory calibrated state),

see section Clear Adjustment of RH Measurement on page 41.

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Vaisala HMP60 Betriebsanweisung Seite 53