Measurement methods
24
During the measurement, the minimum distance between the luminous surface of light source and the
opto-sensor should be more than 15 times greater than maximum size of the luminous surface (or
opto-sensor).
2.3
Typical practice cases
In the following practice cases, the user stands under a light source. Remove the protection cover of
the MS6612 multi-functional light meter sensor and place it at right angle to the light source, as shown in
figure 2-1.
Press and hold the MS6612 power key
④
for a short time to power on the light meter. The LCD
screen will illuminate
（
about 5 seconds
）
with the buzzer beeping twice, and “AUTO” will appear on the
middle of LCD display. This indicates that the auto measurement mode is ON. Press and hold the manual
range switching key
⑨
of the MS6612 for a short time, “MANU” will appear on the top left position of
the LCD display, indicating that the manual range switching mode has been activated. In this mode, each
time
press
and
hold
the
key
for
a
short
time,
the
meter
will
switch
to
20.00Lux—>200.0Lux—>2000Lux—>20000Lux—>200000Lux
(or
20.00Fc—>200.0
Fc—>2000
Fc—>20000 Fc) in sequence; pressing the key for one second will result in the inscription “MANU”
disappearing from top left position of LCD display, replaced by “AUTO” appearing in the middle, to
indicate that the meter has switched the manual range switching mode to the auto range switchover. Press
and hold the REL/PEAK key
⑧
of the MS6612 for a short time, “REL” will appear on the top left
position of the LCD interface, indicating the activation of the relative value measurement mode. Press and
hold the key
⑧
for a short time again, the device will exit the relative value measurement mode and return
to the original measurement mode, and “REL” on the top left position of the LCD interface will disappear;
pressing the key for one second will lead to the peak measurement mode, “PEAK” and “MANU” will
appear on top right position of LCD display; press and hold the key for one second once again, “PEAK”
will disappear from the top right position of the LCD interface, and “AUTO” will appear in the middle of
