Operation Instruction; Main Function - Sentry ST520 Instruction Manual

5. Operation Instruction

5-1 Main Function

Power ON／OFF
Press and hold the Power button for 2 seconds to turn the meter
on. Then all of symbols will appear for 2 seconds on the LCD.
After power-on, the meter will measure and show the readings
on the LCD continuously. Repeat to press and hold the Power
button for 2 seconds again to turn the meter off.
Measuring Units
Press the button to select the illuminance (Ev) unit：Lux
（lx）or foot-candle（fcd）
Measuring light source selection(522)
After power-on, user is suggested to select the type of light
sources to be measured.
In the CT or ⊿CT display mode, press
button for 3
seconds to select different light source for measuring. There are
three different light sources can be selected：FL(Fluorescent),
INC(Incandescent) and LED.
The CT value will be more accurate when the selected light
source is correspondent with the light source is being measured.
If the CT value displays "----", it represents the measured CT
value exceeds the light source's defined value, please select
different light source for measuring.
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