Model
8904A
Performance Tests
Procedure
1.
Connect the Multifunction Synthesizer
OUTPUTS
1
HIGH
output and
OUTPUTS
2
HIGH
output
together with
a
tee,
and connect the tee to the oscilloscope’s input. Switch the oscilloscope input
to
500
or connect
a
50R
load
at
the input using
a
second tee. Refer to Figure
4-5.
2.
On the Multifunction Synthesizer, press
SHIFT PRESET.
After
the instrument presets, key in
fl
(Channel
Config.)
NEXT
SHIFT FLOAT
1
OFF
FREQ
10
kHz
AMPTD
1
V
NEXT
SHIFT FLOAT
2
OFF
FREQ
10
kHz
AMPTD
1
V
INCR SET
.5
mV
PHASE
180
deg
INCR SET
.1
deg
3.
Adjust the oscilloscope vertical gain and sweep speed to view the nearly nulled 10 kHz outputs
4.
On the Multifunction Synthesizer, press
AMPTD
then press the
0
or
U
keys, if necessary, to
from the Multifunction Synthesizer.
minimize the 10 kHz signal on the oscilloscope.
NOTE
Ignore any
high
frequency “fuzziness”
on
the
signal.
The
only concern
is
to
minimize
the
10
kHz
component.
5.
On the Multifunction Synthesizer, press
PHASE
then press the
0
or
U
keys a few times to locate
the null of the 10 kHz signal. The null should occur between 179.9 and 180.1 deg.
(At
10 kHz,
0.1 deg phase shift represents a delay
of
28
ns.)
Phase Null: 179.9 180.1 deg
6.
On the Multifunction Synthesizer, key
in
LAST
FREQ
100
kHz
NEXT
FREQ
100
kHz
AMPTD
1
V
PHASE
180
deg
7.
On the Multifunction Synthesizer, press
AMPTD
then press the
0
or
U
keys, if necessary, to
minimize the 100 kHz signal on the oscilloscope as was done in step
4.
8.
On the Multifunction Synthesizer, press
PHASE
then press the
0
or
U
keys a few times to locate
the null
of
the 100 kHz signal. The null should occur between 179.0 and 181.0 deg. (At 100 kHz,
1
deg phase shift represents a delay of 28 ns.)
Phase Null: 179.0 181.0 deg
Performance Test 10
4-33
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