Sper Scientific 840011 Laser Power Meter - Pocket Size - Manual (Page 2)

Panel Description
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Measurement Procedures
Open the cover by
pressing and
holding the Case
Lock button.
Turn the selector
to the maximum (40 mW) measure-
ment range. If the measurement is
over range, "4000" displays and the "4"
blinks.
Hold the probe’s sensor at a right angle
to the source to be measured. With
some lasers the power may vary due to
"return light" from the light sensor
surface. In such cases, change the
angle of the sensor so that the re-
flected light does not return directly into
the laser light output.
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Case
Lock
Button
Sensor Probe
Probe Storage
Protective
Cover
LCD
Power/Range
Selector
Insert the fresh batteries (match the
polarity) and replace the cover.
Remove the batteries when the instru-
ment will not be used for a prolonged
period.
Note: This instrument uses 633 nm of
a He-Ne laser as the reference wave-
length
To measure light wavelengths other
than 633 nm, convert the reading using
the sensitivity correction coefficient
obtained from the photodiode's spectral
sensitivity characteristics (typical
values).
Min/Max (hold) : Press the Case Lock
button to cycle through minimum hold
("DH" and "MIN" is displayed), maximum
hold ("DH" and "MAX" is displayed), and
normal mode. Min/Max is cancelled
when the range is changed.
Automatic Shut Off: The instrument
has an automatic shut off function in
order to prolong battery life. After
approximately 30 minutes without
activity, the meter will automatically shut
off. When this occurs, turn the range
selector to OFF for about 2 seconds
before selecting a measurement range.
Battery Replacement: Replace the
batteries when "BT"
appears in the display.
Remove the battery
compartment cover using
a screwdriver.
Measurement of weak laser power
(below 1 mW) tends to be affected by
ambient light. In such cases, perform
the measurement in a darkened room.
The probe can be snapped
into a fixed position during
the measurement, as
shown.
After measuring the current
power, set the Power/Range Selector
to the optimum range.
Turn the selector to OFF when the
measurement is complete.
Store the probe so the
sensor faces up. Take
care not pinch the
probe’s wire in the
unit’s cover.
Example: When the measured laser light
wavelength is 780 nm and the power meter
reading is 2.44 mW:
Reading Correction coefficient wavelength-
converted value 2.44 (mW) x 0.73 ═ 1.78 (mW)
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