106 8163A/B, 8164A/B, 8166A/B User’s Guide
3 Power Measurement
To return to setting a constant reference level:
1 Move to the Power Meter channel and press the [Details] softkey.
2 Move to the [Ref Mode] parameter and press Enter.
3 Move to the <Value> menu option and press Enter.
How to Set the Wavelength
This is the wavelength value. The responsivity of the Power Meter varies
with wavelength. For accurate power measurement, you need to input the
wavelength of the optical input. To set the wavelength to 1545.000 nm:
1 Move to the Power Meter channel and press the [Details] softkey.
2 Move to the [
λ] parameter and press Enter.
3 Enter 1545.000 and press Enter.
How to Remove Electrical Offsets
Optical Power Meters measure optical power by converting optical power
to electrical power, and then measuring electrical power. An electrical
offset is electrical power that is always present, even if there no optical
power is input. If electrical offsets are not removed, they affect the
accuracy of power measurement.
Performing a zero sets the zero power level to the average electrical offset
level for the current environmental conditions.
• Allow the instrument time to acclimatize (around 24 hours).
• Allow the instrument time to warm up (around 20 minutes).
• Make sure that the optical input is not receiving any light. If you are
using multi-mode fiber-optic cable, you must disconnect the cable and
cover the input to the Power Meter to perform a zero.
It is good practice to perform a zero before making any important
measurements.
The environmental conditions and the temperature of the instrument
affect electrical offset. For the best results you must:
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