Operating Basics
TDS5000B Series Quick Start User Manual
75
Quick Tips
H Math definitions are not implemente d if the sources are not valid.
H Math waveforms can be created from channel, reference, or math source waveforms.
H Measurements can be taken on math waveforms in the same way as on channel waveforms.
H Math waveforms derive their horizontal scale and position from the sources in their math expressions.
Adjusting these controls for the source waveforms also adjusts the math waveform.
H You can magnify math waveforms using Zoom; use the mouse for positioning the zoomed area.
Spectral Analysis Concepts
Signals may be represented by their characteristics in both the time and the frequency domains. Spectral
analysis merges the time domain controls with the frequenc y domain c ontrols to provide a com plete spectral
analyzer. Consider the following when using spectral analysis:
H Frequency Domain controls use traditional spectrum analyzer controls to set the center frequency, span,
and resolution bandwidth directly.
H Time Domain controls for the acquired waveform set the time duration and the resolution time between
samples. You can easily set the required sample rate and record length.
H Gating Controls are the bridge that conne cts the t ime doma in to the frequency domain. You can perform
spectral analysis on a gated region of the input waveform. This gating also determines the resolution
bandwidth.
H Eight different window functions are available to shape the filter response.
H Display log data in dB, dBm, or linear mode. You can display the real or only t he imaginary parts of the
spectral magnitude. Reference level offset and reference level controls give complete control over the
vertical position and offset of the spectrum.
H Display phase data as a function of frequency in radians, degrees, or group delay. You may zero the phase
value for magnitudes below a user-defined threshold level to prevent the display from becoming unusable
due to random noise .
H You can turn on averaging in the frequency domain for phase and magnitude waveforms.
H Up to four spectral analyzers may be used simultaneously. They may all be assigned to different gates on
the same source waveform or to different channel sources. The controls of Math1 and Math2 may be
locked, and the controls of Math3 and Math4 may be locked. When controls are locked, turning a control
on one a nalyzer changes the control on the other analyzer to the same value. Other combinations of
locking, including all four analyzers, are available using GPIB commands.
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