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281, 282, 284
Users Manual
mode: indep
phase: +000.0º
(actual: +000.0º
status: off view
Selecting the phase soft-key allows the phase to be set by direct keyboard entry or by
rotary control. Setting the phase of a slave positive advances the waveform of the slave
with respect to the master; setting it negative delays the slave with respect to the master.
The phase of each slave channel can be set independently. The phase of the master can
also be set, although this function is intended primarily for use in phase-locking between
two generators. If both the master and the slaves are set to +90 °, say, on the same
generator then the waveforms will all be in phase again; if the master is set to +90 ° and
the slaves set to -90 ° the master and slave waveforms will be 180 ° out of phase.
DDS-generated waveforms can be phase-locked with 0.1 ° resolution up to their
maximum available frequency; sine, cosine, haversine and havercosine are limited to
10 MHz in phase-locked mode.
The phase-locking resolution of arbitrary waveforms will be less than 0.1 ° for
waveforms of less than 3600 points. The phase is fixed at 0 ° for pulses, pulse-trains and
sequences.
Below is a summary of the phase control and frequency range for different waveforms.
Waveform Max waveform
frequency
Phase control
range, resolution
Sine, cosine,
haversine, havercosine
10 MHz
± 360°, 0.1°
Square 16 MHz 0° only
Triangle 100 kHz ± 360°, 0.1°
Ramp 100 kHz ± 360°, 0.1°
Sin(x)/x 100 kHz ± 360°, 0.1°
Pulse & Pulse Train 10 MHz ± 360°, 360° ÷ length or 0.1°
Arbitrary 40 MS/s clock ± 360°, 360° ÷ length or 0.1°
Sequence 40 MS/s clock 0° only
When phase-locking is turned on with the status soft-key the slaves are re-locked
automatically after every phase or frequency setting change.
Further considerations are listed below.
Other Phase-Locking Considerations
The Master-Slave Allocation and Phase Setting between Channels sections contain tables
of specific limitations on the selection of frequency, waveform type and phase-setting
range and resolution. The following four points should also be considered.
1. The waveform filters introduce a frequency-dependent delay above about 1 MHz;
this will affect the accuracy of the phase between locked waveforms at different
frequencies.
2. Square waves, which are 2-point clock synthesized waveforms, will not reliably lock
to other clock synthesized waveforms.
13-4
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