Vaisala HMP110 Podręcznik Użytkownika Pobierz pdf (Strona 41)

Chapter 4 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 39

Set Measurement Units

Use the UNIT command to view or set the measurement units that are

used in the serial line measurement messages.

UNIT [M/N]<cr>

M is for metric units, N is for non-metric units.

Quantity Metric Unit Non-Metric Unit

RH %RH %RH

Td ºC ºF

T ºC ºF

Examples:

unit

Units : Metric

unit n

Units : Non metric

Calibration Commands

Calibrate Humidity Measurement

Use the CRH command to perform a one-point or two-point correction to

the capacitance measurement of the probe. This command changes the

offset and/or gain of the measurement, depending on the calibration and

reference:

- one-point calibration with a single < 50 %RH reference will adjust

the offset of the capacitance measurement

- one-point calibration with a single > 50 %RH reference will adjust the

gain of the capacitance measurement

- two-point calibration will adjust both offset and gain. The first point

requires a < 50 %RH humidity reference, the second point must be

> 50 %RH. There must also be at least 30 percentage point difference

between the references.

CRH [reference]<cr>

When performing a one-point calibration, you need to place the probe in

the reference humidity and wait for 20 – 40 minutes for the humidity to

stabilize. To apply the adjustment, enter the CRH command with the

reference %RH as a parameter.

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Vaisala HMP110 Podręcznik Użytkownika Strona 41