Vaisala HUMICAP HMW90 SERIES Guide de l'utilisateur télécharger pdf (Page 49)

Chapter 4 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 47

Calibration and Adjustment Commands

The following sections describe the calibration and adjustment

commands of the HMW90 series. For general information on performing

calibration and adjustment on the serial line, see section Adjustment

Using a PC on page 59.

The 1-point humidity adjustment of the HMW90 series adjusts both

offset and gain, depending on the adjustment condition. In a dry

condition (for example, 11 %RH), offset is adjusted more than gain.

NOTE

The 1-point humidity adjustment requires that the target condition is at

least 50% of the currently measured value. This prevents the user from

making excessive corrections that are very unlikely to be needed.

However, if you feel that you may have done an incorrect adjustment,

you can easily remove the adjustment using the CRH RESET command.

Adjust Humidity Measurement

Use the CRH command to perform a humidity adjustment of the relative

humidity (RH) measurement. You can do a 1-point or a 2-point

adjustment, or clear the adjustment information from the HTM10

module. Note that the factory adjustment will remain intact when user

adjustment is cleared.

Show Current RH Adjustment

CRH<cr>

Example (showing default offset and gain):

>pass 9000

>crh

RH Gain : 1.000

RH Offset : 0.000

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Vaisala HUMICAP HMW90 SERIES Guide de l'utilisateur Page 49