Tabor Electronics 5251, User Manual

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TE5251
User Manual
1-14
Figure 1-5c Segment 3 – Pulse Waveform
The following sequence was made of segment 2 repeated twice,
segment 1 repeated four times, and segment 3 repeated two times.
Figure 1- 5d. Sequenced Waveforms
Modulated
Waveforms
Using the latest DDS (direct digital synthesis) technology, the 5251
is extremely agile. Operations like sweep, FSK and FM are directly
derived from the DDS circuit by controlling its input bits. The
modulated waveform schemes are described below.
Sweep The 5251 can sweep from minimum to maximum sample clock
frequency boundaries. You may select to sweep up or down using
linear or logarithmic increments. Sweep time is programmable from
10
μ
Hz to 100 MHz and sweep times can be set from 1.4
μ
s to 40
seconds. You may use the sweep in continuous, triggered, or gated
modes.