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2074
User Manual
Adjusting Phase
Offset for Arbitrary
Waveforms
Adjusting Phase
Offset for Modulated
Waveforms
Customizing the
Output Units
Selecting the
Horizontal Units
3-72
The method of setting phase offset between channels when the
2074 is programmed to generate arbitrary or sequenced waveforms
is simpler because you already know how many waveform points
you used for generating your waveform and what is the
programmed sample clock and therefore, as discussed before, the
delay is computed from the following relationship:
Offset [Channel 2] = n x 1/sclk
Or, if you prefer to use phase offset in degrees, compute your
phase offset resolution from the following relationship:
Phase Offset Resolution = 360° / n (where n = wave points)
And then multiply n by the value you program in the Offset ->CH1
field. Navigate to the Outputs menu, as shown in figure 3-45, and
modify the Offset [Channel 2] field as required.
Modulated waveforms are generated digitally and therefore the
phase offset between channels cannot be modified. Using the
modulated waveforms, there is a constant phase offset between the
channels; this phase offset is always 90°. The constant phase offset
for the modulated waveform is especially valuable for generating I &
Q vectors.
There are two parameters that could be customized for easier fit of
the output parameters; These are: the Horizontal Units, the Load
Impedance, Dial Direction, Clock Source and Display Brightness.
Figure 3-47 shows the customization panel. Navigate to the
customization display from the Utility menu. Adjust the brightness
and the dial direction for your preferences and select the clock
source as required by your system management. Information on the
how to adjust the horizontal units and how to adjust the display for
your load impedance is given in the following paragraphs.
Normally, frequency units – Hertz are used when specifying
waveform frequency however, at times and as part of global system
considerations, it makes it more convenient to work with time units
– seconds. The horizontal scale of the 2074 can be modified to
operate either in the frequency domain or time domain. The default
setting for the generator is frequency units.
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