User Manual

HTA106

EN – 5

4.3. FUNCTION KEY DESCRIPTION

4.3.1. ON/OFF key

Press the ON/OFF key to switch on and off the instrument. The ON/OFF key also allows

enabling/disabling the Auto Power OFF function (see § 4.3.6).

4.3.2. HOLD/

key

By pushing HOLD/

key the value measured by the instrument is frozen on the display

and the symbol “Hold” appears on it. Press the HOLD/ key again to disable this function

and resume normal operation. Press and hold the HOLD/ key for at least 1s to

enable/disable the display’s backlight.

4.3.3. MAX MIN key

Press the MAX MIN key permits to detect the Maximum or Minimum values in the “°C”,

“°F”, “%RH”, “WB” and “DP” functions. The display shows the symbol associated with the

selected function: “Max” for maximum value and “Min” for minimum value. Both values are

constantly updated and are displayed cyclically every time the same key is pressed. Long

pressing the MAX MIN key allows quitting the function.

4.3.4. WB/DP key

Press the WB/DP key to enable/disable the Dew Point (DP) and Wet Bulb (WB)

temperature measurement used in buildings and meteorology applications.

4.3.5. °C and °F keys

Press the °C key to select the “Celsius” temperature measurement unit or the °F key to

select the “Fahrenheit” temperature unit. The keys are disabled if the function “HOLD” is

activated.

The formulas for the conversion between Celsius and Fahrenheit degrees are:

T [°C] =

1.8

32 - F][ T 

or T [°F] = T [°C] * 1.8 + 32

so: 0°C is equal to 32°F, 100°C is equal to 212°F

4.3.6. Disabling the Auto Power OFF function

The instrument is provided with an Auto Power OFF (APO) feature which automatically

allows switching it off after 15 minutes of idleness, in order to preserve the internal battery.

To disable this feature please follows the steps below:

1. With the instrument on, press and hold the °C key

2. Press the ON/OFF key. The “

“ symbol (see Fig. 2 – part 10) disappears from display

3. Repeat the same operation of the points 1 and 2 to enable the function again. This

function is automatically restored after each shutdown