Agilent Technologies 71501D, Руководство пользователя

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Eye-Diagram Analyzer Reference
Controlling the Display
Controlling the Display
To Control the
Number of Bits
Displayed The Setup menu’s BIT INTVL softkey allows you to select the number of bits
that will be displayed on the screen. The horizontal time scale automatically
changes to the appropriate setting. Use DELAY to enter time delay. The
amount of delay is entered in bits. Use this feature, in pattern mode, to view
different portions of the PRBS waveform.
The amount of delay can be as much as 1000 times the time span. In addition,
the eye-diagram analyzer can view the trace before the trigger event. Negative
time delay up to {-time span}over2 can be entered.
Set the number of bits displayed by pressing:
Setup , BIT INTVL and enter the number of bits to display.
Set the time delay by pressing:
Setup , DELAY and enter the desired time delay
To Measure in
Optical Power
Units The Trg, Cal menu’s CH1 EXT ATTEN and CH2 EXT ATTEN softkeys allow
you to specify any external attenuation or optical-to-electrical responsivity
conversion between the source and input channels. Specifying an attenuation
on channel 1 changes the measurement plane from the front-panel channel 1
connector to include the indicated attenuation. Specifying an optical-to-elec-
trical responsivity displays optical units referenced to the input of the optical-
to-electrical converter. Channel and marker readouts change to watts/div.
Also, the CH1 EXT ATTEN softkey changes to read CH1 RSPVTY (responsiv-
ity).
To measure the optical power, press:
Trg, Cal , CH1 EXT ATTEN and enter the responsivity value in watts/div
Notice the CH1 EXT ATTEN softkey changes to read CH1 RSPVTY (respon-
sivity).