Performance Tests Model 8904A
Reference Synthesizer
Frequency
(Hz)
1
000
000
500
000
200 000
10
000
1
000
3.
Set the reference synthesizer’s frequency to exactly
1
MHz and its amplitude to
0.7
Vrms
(1
Vpk,
4.
Switch the oscilloscope to the
X
vs.
Y
display mode. Set the vertical sensitivity
of
each input to
5.
Set the frequency
of
the
two
synthesizers as indicated in the following table.
For
each setting
a. Adjust the phase of the reference synthesizer until the “front” and “back” traces of the
Lissajous pattern coincide.
b. On the Multifunction Synthesizer, press
PHASE,
then press the
0
key 19 times and observe
the alignment of the waves of the resulting Lissajous pattern each time. The worst-case
misalignment should be within the limits indicated in the table.
10
Bm) into
50R.
100
mV per division.
perform the following steps.
Misalignment Limits (deg)
Lower Actual Upper
Multifunction Synthesizer
Frequency (Hz)
100
000
-0.05
0.05
50
000
-0.05
0.05
20
000
-0.05
0.05
1
000
-0.05
0.05
100
-0.05
0.05
NOTE
To determine
the
alignment limits, momentarily set
the
phase increment of
the
Multifunction Synthesizer to
0.1
deg, press
0,
observe the misalignment
(which
equals
0.1
deg),
then
press
U.
(0.1
deg
is
the
instrument’s
smallest
phase increment;
0.05
deg
must
be extrapolated from
the
observed
0.1
deg
increment.) Remember to set
the
phe increment back to
18
deg after this
check.
The
vertical gain
of
the
X-axis input can be set to
50
mV
per division
to increase the alignment resolution
if
the
signal does
not
overdrive
the
oscilloscope’s input amplifier.
Also,
perform this test quickly to reduce
the
effects of phase drift
in
the
oscilloscope’s amplifiers.
NOTE
Phase accuracy can be measured at lower frequencies (down to the specified
0.1
Hz)
if the oscilloscope
has
storage capabilities.
At
lower frequencies the
drift
in
the oscilloscope’s vertical amplifiers may become significant.
This concludes the test
if
the instrument does not hwe Option
002.
4-24
Performance Test
7
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