Measurements and Math Functions 5
InfiniiVision 7000B Series Oscilloscopes User’s Guide 203
For the best vertical accuracy on peak measurements:
• Make sure the probe attenuation is set correctly. The probe attenuation
is set from the Channel Menu if the operand is a channel.
• Set the source sensitivity so that the input signal is near full screen,
but not clipped.
• Use the Flat Top window.
• Set the FFT sensitivity to a sensitive range, such as 2 dB/division.
For best frequency accuracy on peaks:
• Use the Hanning window.
• Use Cursors to place an X cursor on the frequency of interest.
• Adjust frequency span for better cursor placement.
• Return to the Cursors Menu to fine tune the X cursor.
For more information on the use of FFTs please refer to Agilent
Application Note 243, ”The Fundamentals of Signal Analysis” at
http://cp.literature.agilent.com/litweb/pdf/5952- 8898E.pdf. Additional
information can be obtained from Chapter 4 of the book “Spectrum and
Network Measurements” by Robert A. Witte.
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