Keysight 86120D and 86122C Multi-Wavelength Meters User’s Guide 99
Specifications and Regulatory Information 4
• Display resolution indicates the minimum incremental change in
displayed power.
Sensitivity
• Sensitivity is defined as the minimum power level of a single laser line
input to measure wavelength and power accurately. A laser line with
less than the minimum power may be measured but with reduced
wavelength and power accuracy. For multiple laser lines input,
sensitivity may be limited by total input power.
Selectivity
• Selectivity indicates the ability to measure the wavelength and power of
a weak laser line in the proximity of a specified stronger laser line and
separated by the specified amount.
Input power
• Maximum displayed level indicates the maximum total input power
(total of all laser lines present) to accurately measure wavelength and
power.
• Maximum safe input power indicates the maximum total input power
(total of all laser lines present) to avoid permanent optical damage to
the instrument.
Maximum number of lines input
Maximum number of lines input is the maximum number of displayed
lines. If more than the specified number of lines is input, only the longest
wavelength lines are displayed.
Input return loss
Input return loss indicates the optical power reflected back to the user’s
fiber cable relative to the input power. It is limited by the return loss of the
front panel connector, and assumes the user’s connector is good.
Measurement cycle time
Measurement cycle time refers to the cycle time when measuring
wavelength and power of laser lines. Specific advanced applications may
require longer cycle times.
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