User's Guide Heavy Duty Datalogging Light Meter 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 TM and Windows compatible software for downloading data. Up to 16,000 readings can be stored on the meter for download to a pc and 99 readings can be stored and viewed directly on the meter’s LCD display.
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 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 icon appears while APO is enabled. 2. To disable the APO feature, simultaneously press and release the RANGE/APO and REC/SETUP buttons.
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” and “MAX” will appear on the display and the meter will only display the highest reading encountered. 2. Press the MAX-MIN button again. “Manu” and “MIN’ will appear on the display and the meter will only display the lowest reading encountered. 3.
Clock and Sample Rate Setup In this mode, the ▲ and ▼ arrow buttons will allow adjustment of the selected (flashing) digits. The ◄ and ► buttons will scroll to the next or previous selection. 1. Power the meter, then press and the REC/SETUP and UNITS buttons simultaneously to enter the Setup mode. The hours display will flash. 2. Adjust and step through each selection as needed. 3. Press and hold the REC/SETUP and UNITS buttons simultaneously to exit the Setup mode.
USB PC Interface Description The HD450 meter can be connected to a PC via its USB interface. A USB cable, along with TM Windows software, is included with the meter. The software allows the user to: Transfer previously stored readings from the meter’s internal memory to a PC View, plot, analyze, store, and print readings data Remotely control the meter via virtual software buttons Record readings as they are taken. Subsequently, printing, storing, analyzing, etc.
Specifications Range Specifications Units Range Resolution Lux 400.0 0.1 4000 1 40.00k 0.01k 400.0k 0.1k 40.00 0.01 400.0 0.1 4000 1 40.00k 0.01k Foot candles Accuracy ± (5% rdg + 10 digits) ± (10% rdg + 10 digits) ± (5% rdg + 10 digits) ± (10% rdg + 10 digits) Notes: 1. Sensor Calibrated to standard incandescent lamp (color temperature: 2856K) 2. 1Fc = 10.
Maintenance Cleaning The Meter and its sensor can be cleaned with a damp cloth. A mild detergent may be used but avoid solvents, abrasives, and harsh chemicals. Battery Installation / Replacement The battery compartment is located on the back of the meter. The compartment is easily accessed by pressing and sliding the rear battery compartment cover off of the meter in the direction of the arrow.
