User manual

HD400 – V2.0 – 5/08

Maximum (MAX) and Minimum (MIN) Reading Memory

The MAX-MIN function allows the meter to store the highest (MAX) and lowest (MIN)

readings.

1. Press the MAX-MIN button to activate the feature. ‘MANU MAX’ will appear on the top

of the display and the meter will only display the highest reading encountered.

2. Press the MAX-MIN button again. ‘MANU MIN’ will appear on the top of the display

and the meter will only display the lowest reading encountered.

3. To exit this mode and return to the normal operating mode, press the MAX-MIN

button a third time.

Relative Mode

The Relative Mode function allows the user to store a reference value in the meter for

which to compare subsequent readings. For example, if the user stores a reading of 100

Lux, all subsequent readings will be displayed as actual reading minus 100.

1. Take the measurement, and when the desired reference value is displayed, press the

REL button.

2. ‘MANU REL’ will appear at the top of the LCD display.

3. All subsequent readings will be offset by the by an amount equal to the reference

level. For example, if the reference level is 100 Lux, all subsequent readings will

equal the actual reading plus 100 Lux.

4. To exit the Relative Mode, press the REL button. ‘MANU REL’ will switch off

indicating that the meter has returned to the normal operating mode.

LCD Backlight

The meter is equipped with a backlight feature that lights up the LCD display.

1. Press the backlight button to activate the backlight

2. Press the backlight button again to switch the backlight off. Note that the backlight will

turn off automatically after a short period of time in order to save battery energy.

3. The backlight function uses extra battery energy. To conserve energy, use the

backlight feature sparingly.