2-12
Modulate
or
Sum
the
Signals
Now Vary
the
Phase
With the
HI?
8904A
you can precisely control the phase
of
each
modulation signal.
3.
Press the
PHASE
key.
4.
Press the
INCR
SET
key and enter
45
degrees.
The
HI?
8904A
allows you to advance the phase
of
the selected channel up to
359.9
degrees.
modulation provided by Channel C is advanced
45"
each time
the
0
key is pressed.
5.
Press the
0
key.
Note on the oscilloscope that the pulse
I
I
I
I
I
I
I
I
Note
If
you continue to press the
0
key, yot; will find that the
HP
8904A does not respond to
your
45 degree increment at
315 degrees. This is because the maximum phase shift allowed by
the
HP
890414 is 359.9 degrees (315
+
45
=
360).
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