Extech 403125 Operating Manual

User's Guide
Digital Light Meter Model 403125
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.
Introduction
Congratulations on your purchase of the Extech 403125 Digital Light Meter. This portable, compact light meter provides lux and fc measurements. This meter includes a backlit LCD display and offers PEAK HOLD and DATA HOLD functionality. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Safety Instructions
It is recommended that the user read and understand the safety and operational instructions before using the light meter. Please read the following WARNINGS:
To avoid electrical shock do not operate this meter in wet or damp conditions.
Do not immerse the meter in liquid. For cleaning instructions, refer to the
maintenance section of this manual.
To avoid injury and fire hazard, do not use this meter in potentially explosive environments.
To avoid eye injury, wear eye protection if there is the possibility of exposure to high intensity light rays.
Cover the sensor head when not in use. This will extend the life of the photo- diode employed in the sensor head.
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Specifications
General Specifications
Display 3 ½ digit backlit LCD display (reads 0 to 1999) Over range indication OL (over load) is displayed Measurement rate 2.5 readings per second (nominal) Battery power Four (4) 1.5V ‘AAA’ batteries Battery life 200 hours typical Low battery indication Battery symbol is displayed when the battery power drops
Operating conditions 32 to 122 Storage conditions -4 to 140
Analog output 0.1mVDC per display digit Dimensions 6.7 x 1.7 x 1.6" (170 x 44 x 40mm) Weight Approx. 7.76 oz. (220g) with batteries
Electrical Specifications
below the operating voltage
o
F (0 to 50oC) < 70% Relative Humidity
o
F (-20 to 60oC) < 80% Relative Humidity (with
batteries removed)
Ranges 20, 200, 2000, 20,000 fc and lux (note that the 20,000 range is
displayed in the x10 mode, meaning that the display must be
multiplied by 10). Resolution 0.01 lux/fc maximum Accuracy 20, 200 ranges: ± (5% of reading + 10 digits)
2000, 20,000 ranges: ± (3% of reading + 10 digits)
Accuracy note: Stated accuracy for ± 9
o
C) < 70% Relative Humidity
23
o
F at 73oF (±5oC at
Spectral response CIE photopic
Note: The CIE photopic curve is an international standard for
the color response of the average human eye. The CIE
standard illuminant ‘A’ is defined as a gas-filled Tungsten-
filament lamp operating at a correlated color temperature of
2856K. Peak Hold response 50ms minimum response time for the measurement of a light
pulse Acceptance angle f ’ Units conversion 10.764 fc = 1 lux (lumens/meter
0.0929 lux = 1 fc (lumens/foot Temperature Coefficient 0.056 times the specified accuracy per
0.1 times the specified accuracy per
< 2% cosine corrected (150o)
2
o
F)
82.4
2
)
2
)
o
F (< 64.4oF or >
o
C (< 18oC or > 28oC)
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