User's Guide
eavy Duty Datalogging Light Meter
H
with PC Interface
Model HD450
Introduction
Congratulations on your purchase of the Extech HD450 Digital Light Meter. The HD450 measures
illuminance in Lux and Foot candles (Fc). The HD450 is a Datalogger and includes a PC interface
and Windows
on the meter for download to a pc and 99 readings can be stored and viewed directly on the
meter’s LCD display. This meter is shipped fully tested and calibrated and, with proper use, will
provide years of reliable service.
TM
compatible software for downloading data. Up to 16,000 readings can be stored
Meter Description
Meter Description
1. Sensor cable plug
2. USB jack for PC interface (under the flip-down cover)
3. LCD Display
4. Upper function button set
5. Lower function button set
6. Power ON-OFF button
7. Light sensor
: The battery compartment, tripod mount, and tilt stand are
NOTE
located on the rear of the instrument and are not pictured
Display Description
1. Clock setting modes
2. Clock display
3. Relative mode icon
4. Auto Power OFF (APO) icon
5. Low battery icon
6. Data Hold icon
7. PEAK HOLD modes
8. Range indicators
9. Unit of measure
10. Digital display
11. Bargraph display
12. Data download to PC icon
13. PC serial connection established
14. Memory address number
15. USB PC connection icon
16. Memory icon
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Operation
Meter Power
1. Press the Power button
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 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. The
2. To disable the APO feature, simultaneously press and release the RANGE/APO and
REC/SETUP buttons. Press and release again to re-activate the APO feature.
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 range icons will appear to identify the range selected.
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 light level on the LCD display (numerically or with the bargraph).
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 to find
the best range for the application.
5. Replace the protective sensor cap when the meter is not in use.
to turn the meter ON or OFF
icon appears while APO is enabled.
Data Hold
To freeze the LCD display, momentarily press the HOLD button. 'MANU HOLD' will appear on the
LCD. Momentarily press the HOLD button again to return to normal operation.
Peak Hold
The Peak Hold function allows the meter to capture short duration light flashes. The meter can
capture peaks down to 10mS in duration.
1. Press the PEAK button to activate the Peak Hold feature. “Manu” and “Pmax’’ will appear on
the display. Press the PEAK button again and “Manu” and “Pmin” will appear. Use ‘Pmax’ to
capture positive peaks. Use ‘Pmin’ to capture negative peaks.
2. When the peak has been captured, the value and associated time will remain in the display
until a higher peak is recorded. The bargraph display will remain active displaying the current
light level.
3. To exit the Peak Hold mode and return to the normal operating mode, press the PEAK button a
third time.
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