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Spectral Controls: Acquisition
Access this control window from the Math menu Spectral Controls command or the Controls button on
the Spectral Setup control window.
Overview
Use the time domain acquisition controls to view spectral waveforms.
To Use
Click the control that you want to change, and use the multipurpose
knob to adjust the value.
Behavior
Rec Length
(Record Length) is the total number of samples in the
waveform acquisition. The maximum record length depends on the
amount of memory. The record length determines the duration,
which is expressed in seconds. Long record lengths can slow
instrument response, but also lower the noise relative to the signal
and increase the frequency resolution for the spectral math
waveform.
Sample Rate is the number of acquisition samples per second. The
faster the sample rate, the more accurately the instrument can
represent fine details in a fast signal. The sample rate determines the
acquisition duration, which is expressed in seconds.
The usable bandwidth of the signal equals one half the sample rate and is expressed in hertz.
Duration is the length of the acquired waveform in seconds. Adjusting the duration usually
changes the record length without changing the current sample rate, similar to spectral analyzer
frequency domain span and center frequency controls. Resolution is the time between sample
points. Changing the resolution changes the record length and the sample rate so that the selected
duration setting remains constant.
Note
The Acquisition controls interact with the Gating and Frequency domain controls; changing one
set of controls may change some other control settings.
Summary of Contents for TDS5000B Series
Page 36: ...36 AFTDS Differential Signal Adapter...
Page 280: ...280 Blackman Harris window...
