TREND NETWORKS FiberMASTER 33-931 Guide D'utilisation page 4

Light Source Indicators and Functions
1. Wavelength LEDs. Lights green to indicate active
source. Blinks red when battery is low. At 3.6V unit will
power off after 10 minutes. At 3.3V unit will power off
after 5 seconds.
2. Power button. Press the toggle wavelength, hold to
power off.
1
2
The power output of the light source will vary slightly during the first five
minutes of operation as it warms to operating temperature. To ensure best
measurement accuracy, allow the light source to operate for five minutes
before calibrating the meter or making measurements.
4