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AGILENT 35670A
Supplemental Operator’s Guide
58
Section 20 : Peak Hold During a Machine Run-up and Coast-Down
Peak amplitudes experienced during run-ups and coast-downs can be measured
directly with the AGILENT 35670A using peak hold. Although the resulting spectra
will indicate the maximum amplitude measured in each frequency bin during the
course of the run-up and run-down, it is not possible to determine from this
information whether the peak was due to the fundamental frequency or a harmonic.
To measure peak amplitudes, peak hold averaging is selected with enough averages
specified so that peaks can be accumulated during the entire run-up and run-down,
after which the measurement is paused and the results examined.
To set up a single-channel peak hold average for a run-up duration of 1 minute,
proceed as follows:
• Select a frequency span and resolution, for example 800 Hz and 400
lines.
• Determine the time record length for this combination,
T=N/F=400/800=0.5 s
• Determine how many averages are required to last for the measurement
duration. Navg=Duration/T=60/.5=120 averages
• Specify number of averages to be greater than this number.
Preset the AGILENT 35670A
• Turn on the AGILENT 35670A, or
• Press the green [Preset] hardkey
• Press the yellow [Pause/Cont] hardkey if desired.
• Press [CHANNELS 1 24 ] softkey (F7) until 1 is highlighted.
Specify measurement parameters
• Press the [Freq] hardkey
• Enter 800 and then press the [Hz] softkey (F2)
• Press the [Avg] hardkey.
• Press the [NUMBER AVERAGES] softkey (F2), enter 200, then press the
[ENTER] softkey (F1).
• Turn on averaging by pressing the [AVERAGE ON OFF] softkey (F1)
until ON is highlighted.
• Press the [AVERAGE TYPE] softkey (F3).
• Press the [PEAK HOLD] softkey (F5).
Set up display format to measure peak amplitude
• Press the [Disp Format] hardkey.
• Press the [SINGLE] softkey (F1)