LUX LIGHT METER
MODEL 91194
OPERATING INSTRUCTIONS
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyright© 2004 by Harbor Freight Tools®. All rights reserved. No portion of this
manual or any artwork contained herein may be reproduced in any shape or form
without the express written consent of Harbor Freight Tools.
For technical questions, please call 1-800-444-3353.
3.
4.
Use the right product for the job. There are certain applications for which this
product was designed. Do not modify this product, and do not use this product for
a purpose for which it was not intended.
Maintain labels and nameplates on this product. These carry important infor-
mation. If unreadable or missing, contact Harbor Freight Tools for a replacement.
5.
6.
Do not use this product in excessive heat and humidity conditions.
Do not allow children to handle this product. This product is constructed with
small parts that may pose a serious choking hazard if swallowed.
7.
WARNING! The warnings, precautions, and instructions discussed in this manual
cannot cover all possible conditions and situations that may occur. The operator
must understand that common sense and caution are factors, which cannot be built
into this product, but must be supplied by the operator.
OPERATING INSTRUCTIONS
NOTE: For additional references to the parts listed in the following pages refer to
Figure A, below.
PHOTO DETECTOR (5)
LCD DISPLAY (1)
POWER SWITCH (2)
RANGE SELECTION SWITCH (3)
DATA HOLD SWITCH (4)
FIGURE A
Press the Power Switch (2) to turn the Light Meter “ON”. Press the Power Switch
1.
2.
again to turn the Light Meter “OFF”. (See Figure A.)
Press the Range Selection Switch (3) to select between the ranges of 1 ~ 2,000/
20,000/50,000(200,000) Lux. At the same time, the LCD Display (1) will indicate
the value by which to multiply to receive the correct value. (See Figure A.)
SKU 91194
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3.
4.
Face the Photo Detector (5) in a horizontal position toward the light source.
(See Figure A, previous page.)
Read the number on the LCD Display (1). If the LCD Display only shows “1”, the
input signal is too strong and a higher measuring range should be selected.
(See Figure A.)
5.
6.
Press the Data Hold Switch (4) and “H” will illuminate on the LCD Display (1). The
most recent value will continue to show on the LCD until the Power Switch (2) is
pressed or the Data Hold Switch is pressed again. (See Figure A.)
After completing the measurement, make sure the Light Meter is turned “OFF” and
the Photo Detector (5) is covered. Then, store the unit in its Carrying Case.
(See Figure A.)
TO REPLACE THE BATTERY
When the 9 volt Battery (not included) becomes low, the letters “BT”
will illuminate on the LCD Display (1). To replace the Battery, remove the
Screw on the Battery Compartment Door located on the back of the Light
Meter. Then remove the Battery Compartment Door by sliding it down. Re-
move the old Battery. Install a new 9 volt Battery. Then, replace the Battery
Compartment Door and the Screw. (See Figure B.)
REAR VIEW
BATTERY
SCREW
COMPARTMENT
DOOR
FIGURE B
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SPECTRAL SENSITIVITY CHARACTERISTICS
SPECTRAL SENSITIVITY
100
-V(r)
80
LIGHT
METER
RELATIVE
SENSITIVITY
(%)
60
40
20
0
FIGURE C
400
500
600
700
WAVELENGTH (nm)
INSPECTION, MAINTENANCE, AND CLEANING
1.
2.
Before each use, inspect the general condition of the Light Meter. Check for bro-
ken, loose or missing parts; low Battery; any condition that may affect the proper
operation of the product. If a problem occurs, have the problem corrected before
further use. Do not use damaged equipment.
Do not use abrasives or solvents to clean this product.
Please Note:
While the manufacturer has made every effort to ensure this is a
reliable and accurate tool, neither Harbor Freight Tools nor the manu-
facturer can be held responsible for any errors in lighting placement/
adjustment; the costs of any wasted film, time, etc.; or any other costs
incidental to any errors in measurement.
NOTE: No individual replacement parts are available for this product.
SKU 91194
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