User's Manual

Table Of Contents

5.6.1 Humidity Calibration

Prior to entering the calibration mode, press the CHANNEL/+ button to select

the humidity sensor you wish to adjust.

To enter the humidity calibration mode, press and hold the ADJUST and

MIN/MAX buttons at the same time for 5 seconds and the humidity value will

begin flashing. Press the CHANNEL/+ button to increase the humidity and the

MIN/MAX/- button to decrease the humidity reading in 1% increments. To

rapidly increase (or decrease) the humidity reading, press and hold the

CHANNEL/+ or MIN/MAX/- button.

To return the humidity to the actual or uncalibrated measurement, press the

ADJUST button.

Once the displayed humidity equals the calibrated source, press and hold the

ADJUST button for three seconds, or wait 15 seconds for timeout, and the

humidity value will stop flashing.

Discussion: Humidity is a difficult parameter to measure electronically and

drifts over time due to contamination. In addition, location has an adverse affect

on humidity readings (installation over dirt vs. lawn for example).

Official stations recalibrate or replace humidity sensors on a yearly basis. Due to

manufacturing tolerances, the humidity is accurate to ± 5%. To improve this

accuracy, the indoor and outdoor humidity can be calibrated using an accurate

source, such as a sling psychrometer:

or one step humidpak calibration kits (reference Section ). You can also

use common table salt, water and a plastic bag:

5.6.2 Temperature Calibration

Prior to entering the calibration mode, press the CHANNEL/+ button to select

the temperature you wish to adjust.

To enter the temperature calibration mode, press and hold the ADJUST button

for 5 seconds and the temperature value will begin flashing. Press the

CHANNEL/+ button to increase the temperature and the MIN/MAX/- button to

decrease the temperature reading in 0.1° increments. To rapidly increase (or

decrease) the temperature reading, press and hold the CHANNEL/+ or

MIN/MAX/- button.

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