User manual

HD400 – V2.0 – 5/08

Operation

Meter Power

1. Press the Power button

to turn the meter ON or OFF

2. If the meter does not switch on when the power button is pressed or if the low battery

icon is displayed on the LCD, replace the 9V battery

Auto Power Off (APO)

1. The meter is equipped with an automatic power off (APO) feature that turns the meter

off after 20 minutes of inactivity

2. To defeat the APO feature, press and hold the APO button. While holding down the

APO button, press the RANGE button to switch off the circular APO symbol on the

upper left-hand corner of the LCD. Repeat this step to re-activate the APO feature.

The APO icon will reappear.

Unit of Measure

Press the UNITS button to change the unit of measure from Lux to Fc or from Fc to Lux

Range Selection

Press the RANGE button to select the measurement range. There are four (range)

selections for each unit of measure. The units display and decimal point location identify

the range selected. Refer to the Range Specifications section of this User Guide for

detailed range information.

Taking a Measurement

1. Remove the sensor’s protective cap to expose the white sensor dome

2. Place the sensor in a horizontal position under the source of light to be measured

3. Read the illuminance measurement on the LCD display.

4. The meter will display ‘OL’ when the measurement is outside of the meter’s specified

range or if the meter is set to the wrong range. Change the range by pressing the

RANGE button.

5. Replace the protective sensor cap when the meter is not in use.

Data Hold

To freeze the LCD display, momentarily press the HOLD button. 'MANU HOLD' will appear

on the upper left-hand side of the LCD. Momentarily press the HOLD button again to return

to normal operation ('MANU HOLD' will switch off).

Peak Hold

The Peak Hold function allows the meter to capture short duration light flashes. The meter

can capture peaks down to 10µS in duration.

1. Press the PEAK button to activate the Peak Hold feature. ‘MANU Pmax’’ will appear

on the display. Press the PEAK button again and ‘MANU Pmin’ will appear. Use

‘Pmax’ to capture positive peaks. Use ‘Pmin’ to capture negative peaks.

2. To exit the Peak Hold mode and return to the normal operating mode, press the

PEAK button a third time.