401020 Datasheet, PDF (3/4 Pages) Extech Instruments Corporation. – Light Meter Adapters

4. OPERATION
4.1 Insure that a fresh battery is installed in the adapter by moving the Power/Range
Select switch from the OFF position to one of the range select positions. If the Power
ON light doesn't glow or if the Low Battery LED does glow, check the battery.
4.2 Connect the adapter to the COMMON and VOLTAGE inputs of a multimeter via the
adapter's banana plugs. The polarity of the connection should be reversed if a negative
light level reading is indicated on the multimeter.
4.3 Set the mulitmeter to the mV or higher DC voltage position. Adjust the range to suit
your display needs. Do not use autorange if possible.
4.4 Select the maximum range via the Range Select Switch and move lower in range as
needed.
4.5 Hold the Light Sensor so that it faces the light source to be measured. The
multimeter's display will indicate light level readings. Refer to Sections 5 and 6 for
additional measurement considerations.
5. CORRECTION FACTOR FOR DIFFERENT TYPES OF LIGHTING
The light adapter is calibrated using a
precise "Standard tungsten light source
of 2856oK". If the meter is to measure
a different type of lighting, the
correction factor table, below, should
be applied to the readings. Multiply the
multimeter readings by the factors in
the right column for a particular lighting
type shown in the left column.
Lighting Type
MERCURY LAMP
FLUORESCENT
LAMP
DAYLIGHT
SODIUM
METAL HALIDE
Multiplication Factor
x1.14
x1.08
x1.00
x1.22
x1.00
6. RANGE SELECTION
The meter has three measurement ranges (0-200, 0-2000, and 0-5000 Fc) or (0-2000, 0-
20000, and 0-50000) Lux). The proper range selection will produce the most accurate
reading. Always select the range that produces the maximum number of digits without
exceeding the maximum count for that particular range. For example, a reading of 1456 Fc
should be read on the 0 - 2000 range, not the 0-5000 range.
7. BATTERY REPLACEMENT
When the Low Battery status LED glows, replace the battery as soon as possible. Open
the Battery Compartment by removing the rear screw. Remove the battery, replace it
with a fresh 9V battery and re-assemble the meter.
8. CALIBRATION / REPAIR SERVICES
Extech offers complete repair and calibration services for all of the products we sell. For
periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be performed
on an annual basis to insure calibration integrity.
9. 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 on 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 [phone] for authorization. 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.
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401020 and 401021 Ver. 1.03 11/99