Model 428 User’s Manual OPERATION
Bristol Instruments, Inc. 14
Average (AVG) – The instrument displays the results from each
measurement, or the result from an averaged number of measurements
(2, 4, 8, 16, 32, 64, or 128) chosen in Config Screen 1. The instrument will
display a measurement after the chosen number of interferograms is
collected, averaged, and analyzed. For averages between 2 and 32, the
display will then be updated with each successive measurement. For
averages of 64 or 128, the display will be updated after each block of
interferograms has been averaged.
Use the Select button to highlight the Average value, and the Change or
Arrow buttons to cycle through the averaging states. Off indicates that the
average function is disabled, while a numeric value indicates that an average
is being calculated.
Power Offset (Poffs) – The instrument can adjust the power measurement
to account for an external attenuator by using a Power Offset value equal to
the external attenuation. This is useful if the optical input power would
otherwise exceed the maximum allowed input of 10 mW (10 dBm). The
Power Offset value (1-20 dB) is chosen in Config Screen 1.
Use the Select button to highlight the Power Offset value, and the Change or
Arrow buttons to adjust the Power Offset state. Off indicates that the Power
Offset is disabled, while a numeric value indicates that the Power Display is
adjusted by the specified Power Offset.
Signal-to-Noise Ratio (SNR) – This indicates how OSNR values are
calculated. Use the Select button to highlight the SNR value, and the Change
or Arrow buttons to adjust the SNR state. OSNR is calculated relative to the
interpolated noise at the channel location (Auto), or at a user selected noise
location (User). The noise location and noise bandwidth are chosen in Config
Screen 3.
Sorting Type – Displays the current sorting type for the list data. Use the
Select button to highlight the Sorting Type value, and the Change button to
cycle through the options (Wav or Pow).
List Mode Display Screen – Drift
Displays each channel’s tracked measurement behavior in a variety of ways. The
different options for display are the difference between each channel’s maximum
and minimum wavelength/power values (Max-Min), each channel’s maximum
wavelength/power values (Max), each channel’s minimum wavelength/power values
(Min), and the difference between each channel’s current wavelength/power values
and the wavelength/power values at the start of the measurement period (Diff). Use
the Select button to highlight the Drift value, and use the Change button to cycle
through the display options.
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