Tektronix CSA7404B User Manual

Creating and Using Math Waveforms
CSA7000B Series & TDS7000B Series Instruments User Manual
3- 185
Gate
width
Zero phase reference
Time domain acquisition
Frequency domain samples
Gate position
Gate
Trigger
position
Duration
Figure 3- 48: Definition of gate parameters
The gate must reside within the duration interval of the source waveform. If the
source waveform duration is adjusted and the gate position and width would
result in the gate being outside of that duration then the gate position or width is
set within the limits.
The width of the gate affects the resolution bandwidth of the spectral analyzer.
See Using Spectral Math Controls on page 3--183 for more details.
The data contained in the gated region is transformed to the frequency domain.
The gate is identified on the display using dashed markers (similar to cursors).
The default gate width setting is equal to the duration of the source waveform.
Using the Frequency Domain controls. The gated region of the source waveform is
transformed by the spectral analyzer to a spectral waveform. This may be a phase
or magnitude waveform. The horizontal units are always Hz. The vertical units
depend on whether phase or magnitude is selected. The frequency domain
controls for the spectral waveform are span, center, and resolution bandwidth.
The spectrum normally appears on the display fit to a screen width of 10 divi-
sions.
H Span. The span is the stop frequency at the end of the spectral waveform
minus the start frequency at the beginning of the waveform. The span control
maximum value is equal to the current sample rate divided by two. There-
fore, if you are unable to increase the span to the desired value and if you
want to keep the same source waveform duration, go to the timebase controls
and increase the sample rate using the resolution control. Or, if you want to
also decrease the source waveform duration, adjust the sample rate control. If
you decrease the sample rate, the span setting may decrease, if necessary, to
keep the span less than the sample rate divided by two.

Tektronix CSA7404B Specifications

General

Brand	Tektronix
Model	CSA7404B
Category	Measuring Instruments
Language	English