Deluxe Optical Power Meter with Memory
4.5 Setting and Checking the Reference Level
1.Setting the reference level: Press and hold the 
key for more than two seconds to store the presently measured value as the new reference level for the current wavelength. Once you set the new reference level, the LCD displays 0.00 dB, the buzzer sounds, and the power meter switches to dB measurement mode.
2.Checking the reference level: Press the 
key to display the stored reference
level for the current wavelength. 
will be displayed on the LCD to indicate that it is a reference value. The reference value will only be displayed for about one second. The instrument then switches to the dB measurement mode.
4.6Switching LCD Backlighting On and Off
1. Press the 
key. Backlighting switches on.
2. Press the 
key again. Backlighting switches off.
Figure |
4.7 Frequency Detecting
If the tested wavelength is carrying a tone of 270 Hz, 1 kHz, or 2 kHz, the frequency shows on the screen.
Figure 4-8. Frequency.
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