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AGILENT 35670A
Supplemental Operator’s Guide
5
Section 4 : Measuring a Single Channel Power Spectrum - Displacement
This section contains procedures for setting up and measuring a single channel
power spectrum of displacement using an AGILENT 35670A Dynamic Signal
Analyzer. Included are steps to select single channel operation, set up transducer
parameters, frequency span, choose input range, select windowing, and turn on
averaging in order to improve measurement accuracy. Instructions will also be
presented to set up trace coordinates and trace scaling.
Selecting Single Channel Operation
Specify the single-channel instrument mode to measure one signal. However it
should be noted that it is acceptable to measure a single channel in the default two-
channel instrument mode and simply ignore the second channel. Nevertheless
instructions will be given here to measure in single channel mode.
To measure a single-channel spectrum, turn on the AGILENT 35670A and then:
• Press the [Inst Mode] hardkey
• Press [CHANNELS 1 24 ] softkey (F7) until 1 is highlighted.
Setting Up Transducer Units for Displacement
To measure power spectrums using a displacement transducer with a sensitivity of
200 mV/mil, follow these steps:
• Press the [Input] hardkey.
• Enter 800 and then press the [Hz] softkey (F2).
Any frequency below 51.2 kHz may of course be entered, however the analyzer will
select the lowest span that contains the desired frequency. For example, if 1200 Hz
is entered, the analyzer is switched to a span of 1600 Hz.
Selecting Frequency Span
The default frequency span after turn-on is 51.2 kHz, which is usually too high for
most transducer measurements. To reduce the span to 800 Hz, perform the following
steps:
• Press the [Freq] hardkey.
• Enter 800 and then press the [Hz] softkey (F2).