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Overload protection: 15 seconds maximum 250V dc or 250V ac
rms.
OPERATION
Measuring sound level
1)
Turn the power/function/range switch to "dB" position.
2)
Remove the meter and face the microphone to sound source
in a horizontal position.
3)
The C-weighting curve is nearly uniform over the frequency
range from 30 to 10,000Hz, thus giving an indication of overall
sound level.
4)
The fast response is suitable to measure shout bursts and
peak values from sound source.
5)
The sound level will be displayed.
6)
Note: Strong wind (over 10m/sec.) striking the microphone can
cause misreading for measurement in windy locations, a wind-
screen should be used in front of microphone.
Measuring light (Lux)
1)
Turn the power/function/range switch to select the "lux" scale
and set the range to desired ("lux" or "x10 lux") range.
2)
Remove the meter and face the photo detector to light source
in a horizontal position.
3)
Read the illuminance nominal from the LCD display.
4)
Over-range: If the instrument only displays one "1" in the
M.S.D. the input signal is too strong, and a higher range
should be selected.
5)
When the measurement is completed, replace the photo
detector from the light source.
6)
Spectral sensitivity characteristic: To the detector, the applied
photo diode with filters makes the spectral sensitivity
characteristic almost meet C.I.E. (International Commission on
Illumination) photopia curve V (Ω) as the following chart
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