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3-4
Using the Optical Spectrum Analyzer
Front-Panel Keys
Pressing the
Auto Meas
button on the front panel of the OSA performs an auto-
matic measurement of the largest signal found in a full span sweep and places
a marker at the signal peak. Auto measure requires the connection of an
external light source. This can be a broadband or narrowband source. If there
is insufficient signal power, the automatic measurement will not be performed,
and a warning message will be reported. This automatic measurement routine
is normally the best way to adjust sensitivity while maintaining the fastest
sweep rates.
The Auto Measure function uses trace A to perform the measurement. Since
the Auto Measure function can alter the instrument state, we recommend that
this operation be performed
before
a measurement sequence is started.
Using the Auto Measure Setup panel shown below, you can modify the
automeasure span and the vertical scale, tune to the wavelength indicated by
the marker and optimize the sensitivity. See “To change the automeasure
defaults” on page 3-53 for more information.
To perform an Auto Measure from the remote interface, see the descriptions
of the following remote commands:
“DISPlay[:WINDow[1]]:TRACe:ALL[:SCALe][:AUTO]” on page 4-71
“DISPlay[:WINDow[1]]:TRACe:X[:SCALe]:AUTO:SPAN
<numeric_value>[M|NM|UM]” on page 4-74
“DISPlay[:WINDow[1]]:TRACe:X[:SCALe]:AUTO:SPAN:AUTO ON|OFF|1|0”
on page 4-74
“DISPlay[:WINDow[1]]:TRACe:Y[:SCALe]:AUTO:PDIVision
<numeric_value>[DB]” on page 4-74
“DISPlay[:WINDow[1]]:TRACe:Y[1|2][:SCALe]:AUTO:PDIVision:AUTO
OFF|ON|0|1” on page 4-74
“DISPlay[:WINDow[1]]:TRACe:ALL[:SCALe][:AUTO]:MARKer OFF|ON|0|1”
on page 4-73
“DISPlay[:WINDow[1]]:TRACe:ALL[:SCALe][:AUTO]:OPTimize
OFF|ON|0|1” on page 4-73
book.book Page 4 Monday, January 31, 2000 10:34 AM