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AGILENT 35670A
Supplemental Operator’s Guide
53
• Turn up the level control on the shaker amplifier until the excitation is
noticeable, but does not buzz or rattle. If buzzing or rattling is heard,
then either the level is too high or the structure is loose and must be
quieted.
• Press the [MORE CHOICES] softkey (F9)
• Press the [BURST RANDOM] softkey (F2)
Set up the trigger
• Press the [Trigger] hardkey.
• Press the [SOURCE TRIGGER] softkey (F4).
To acquire a burst random frequency response of the structure:
• Press the yellow [Start] hardkey.
Avg
[FFT]
Type: RMS Number: 10
Update Rt: 5 Overlap: 0 %
Date: 10-02-96 Time: 09:49:00 PM
X:0 Hz Y:0 deg
0Hz 400HzAVG: 10
A: Freq Resp2/1 X:0 Hz Y:84.6724 e-3
1
1
e-3
LogMag
3
decades
B: Freq Resp2/1
180
deg
-180
deg
Phase
36
deg
/div
0Hz 400HzAVG: 10
Viewing Frequency Response Results with a Nyquist Diagram
The previous display shows frequency response results with Log Magnitude and
Phase traces. Other trace coordinates are available. To examine results in a Nyquist
Diagram, proceed as follows: