Sper Scientific 840021 Light Meter Foot Candle User Manual
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3. MEASUREMENT PROCEDURES
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Insert the SENSOR (12) plug into the SENSOR INPUT (8) socket.
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Turn the meter on using the ON (2) button.
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Remove the lens cap from the PHOTO SENSOR (11).
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Press the 200 RANGE (5) button for measurements of 0 ~ 199.9 FC, or
select the 2000 RANGE (6) button for measurements of 200 ~ 1999.9 FC.
If you are uncertain about which range to use, select the highest range.
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Range Overload is indicated when "1" appears on the left side of the
display. If this occurs, switch to the highest range or discontinue use.
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Point the PHOTO SENSOR (11) toward the source and read the results
on the display. Divide the meter reading by the factor of .0929 to convert
FC results to LUX.
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Push the HOLD (4) button to freeze the reading in the display. The word
"HOLD" appears on the LCD. Press the HOLD (4) button again to exit
this function.
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Press the OFF (3) button to turn the unit off.
Notes:
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Keep the lens cap on the PHOTO SENSOR (11) at all times except when
actually taking a reading.
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Fluctuations in the reading are generally due to shadows or fluctuations in
the line voltage. Ambient temperature, drafts and ventilation also affect
the luminous flux output.
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Avoid range overload and do not store in areas of high temperature
and / or humidity. Remove the battery for long-term storage.