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Triggered Burst and Gate
Sync Out in Triggered Burst and Gated Mode 7
The start phase, i.e. the point on the waveform cycle at which the gated waveform starts,
can be selected by pressing the phase soft-key followed by direct entries from the
keyboard or by using the rotary control. Since the waveform cycle is always completed
at the end of the gated period the start phase is also the stop phase.
The phase can be set with a precision of 0.1 ° but the actual resolution is limited with
some waveforms and at certain waveform frequencies as detailed below. To indicate
when this is the case the actual phase is shown in brackets as a non-editable field below
the programmed value.
To achieve start phase precision all waveforms are run in clock synthesis mode, i.e. as if
they were arbitrary waveforms, when gated mode is specified. This limits frequency
resolution to 4 digits for all waveforms although the waveforms normally generated by
DDS are still entered with 7-digit precision. Sine, cosine, haversine (etc.) waveforms are
created as if they were arbitrary waveforms with the first point of the waveform exactly
at the start phase. Each time the phase or frequency is changed the waveform is
recalculated, and this can cause a slight lag if the parameters are changed quickly using
the rotary control.
The phase resolution of true arbitrary waveforms is limited by the waveform length since
the maximum resolution is 1 clock; thus waveforms with a length greater than 3600
points will have a resolution of 0.1 °, but below this number of points the maximum
resolution becomes 360 ° divided by the number of points.
Square waves, pulse, pulse trains and sequences have no start phase adjustment. Their
phase is always fixed at 0°.
Refer to the table in the Triggered Burst section above for a summary of start phase
capabilities.
Sync Out in Triggered Burst and Gated Mode
When triggered burst or gated modes are selected the SYNC OUT source automatically
defaults to trigger; this is a positive-edged signal synchronized to the actual trigger
used whether internal (from the internal trigger generator or an adjacent channel) or
external of either polarity.
Alternatively, SYNC OUT can be set to burst done on the SYNC OUT set-up
screen; this provides a SYNC OUT signal which is low while the waveform is running
and high at all other times.
7-7
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