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54504A Frequency measurement

Question asked by charlieshaw on Apr 9, 2009
Latest reply on Apr 10, 2009 by ko2054

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When using the frequency display function of this scope, I am not getting a stable reading even though the source is accurate and constant. At 100Hz input, the display will fluctuate from 99.200 to 100.200 to 101.200. The same thing happens at 1000Hz or 100kHz. Is this normal for this scope? If not, it must mean I don't know what I am doing, or it is defective. This is a recent purchase that was physically damaged in shipping, other than the frequency issue it appears operationally fine. Does anyone know of a manual available for this scope other than the programing manual that is still available from HP?

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ko2054 Apr 10, 2009 2:43 PM
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Hello Charles, vertical noise will cause the measurement to vary. Try turning on averaging to reduce the vertical noise. You can also get unstable measurements if you have too many pulses on the screen. Try adjusting the timebase controls for your specific measurement. For a rise time you would want the leading edge to take up about six divisions. For vertical measurements, you want to adjust the vertical controls for about six or seven divisions. For a frequency period, try setting the timebase controls so one or two pulses are displayed. Also, for timing measurements, it is good to adjust the vertical controls so six or seven divisons are displayed vertically.
I have a user's reference for that scope, but it is not in a PDF format. How about you email me at support_col@agilent.com. I can scan a few pages and send to you. Let me know if any of those suggestions help you out.
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54504A Frequency measurement

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