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2074
User Manual
3-26
waveforms in the market – sine waveform. Figure 3-14 shows a list
of all other waveforms that the instrument can generate however,
one must not forget that the waveforms are generated digitally from
either lookup tables or formulated from standard equations and
therefore, each time a new waveform is selected, one should
expect to have a slight delay between the time the waveform was
selected to when it is being generated at the output connector.
The waveforms that reside in the built- in library are referred to as
Standard Waveforms. The meaning of this term is that these
waveforms have standard characteristics that is commonly known
and or associated with these waveforms. For example, sine
waveform has known spectral and power distribution that could be
compared to published mathematical equations. The quality of the
generator determines how closeness of the waveform generation to
its pure mathematical properties.
The 2074 has a library of 10 standard waveforms: Sine, Triangle,
Square, Ramp, pulse, sinc, Gaussian, Exponential, DC and Noise.
Some of the parameters for these waveforms can be modified to
fine tune the waveforms for specific applications. For example,
changing the sine start phase on channels 2 and 3 create a three-
phase sine system. The standard waveforms and their parameters
that can be modified are summarized in the following paragraphs.
Figure 3-14, Built-in Standard Waveforms Menu
Sine Wave
The sine waveform is the most commonly used waveform. The
waveform is generated from a lookup table that has 1000 points
and therefore, the sine waveform is generated with 1000-points
accuracy up to about frequency setting of 200 kHz (output
frequency = sample clock frequency / number of points). As
frequency is increased above 200 kHz the number of points is being
reduced automatically up to a point where filters are being switched
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