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11
should be more than 15 times greater than maximum size of
the luminous surface (or opto-sensor).
Typical practice cases
Remove the protection cover of the MT-4617
multi-functional light meter sensor and place it at right angle
to the light source.
Press and hold the MT-4617 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
MT-4617 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
to20.00Lux—>200.0Lux—>2000Lux—>20000Lux—>20000
0Lux (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 MT-4617 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
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