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AGILENT 35670A
Supplemental Operator’s Guide
39
Section 15 : Waterfall Spectra at Time Intervals
Waterfalls on the AGILENT 35670A can be used to examine and compare spectra at
fixed intervals of time. This is especially useful when measuring non-stationary
signals from machinery, such as during run-ups and run-downs. To see a waterfall
display of the vibration signature, follow these steps:
Preset the analyzer as follows:
• Press the green [Preset] hardkey
• Press [DO PRESET] softkey (F1).
• Press the [Pause/Cont] hardkey if desired.
Selecting Single Channel Operation
Specify the single-channel instrument mode to measure one waterfall. Note that it is
possible to measure and display waterfalls for two channels simultaneously. For
single channel operation, however, the display performance will be better with only
one channel active. To measure a single-channel waterfall, turn on the AGILENT
35670A and then:
• Press the [Inst Mode] hardkey
• Press [CHANNELS 1 24 ] softkey (F7) until 1 is highlighted.
Selecting Measurement Parameters
Refer to the section entitled “Measuring Single Channel Spectra” to set up span,
ranges, coupling, averaging, and windowing. Transducer parameters set up is
described in the section “Measuring with Transducers.”
Setting Up the Waterfall Display
The best view of a waterfall includes the current power spectrum above the waterfall
trace. In the AGILENT35670A this is implemented with the UPPER/BIG LOWER
display format as follows:
• Press the [Disp Format] hardkey.
• Select the [UPPER/ BIG LOWER] softkey (F4).
• Press the [Active Trace] hardkey.
• Select the [A] softkey (F2).
• Press the [Meas Data] hardkey.
• Toggle the [CHANNEL 1 234] softkey until 1 is highlighted.
• Press the [PWR SPEC CHANNEL 1] softkey (F3).
Continuing to set up a waterfall display,
• Press the [Active Trace] hardkey.
• Select the [B] softkey (F2).