Model 8904A
Performance Tests
SHIFT DESTN
1
AMPTD
1
V
INCR
SET
.5
mV
PHASE
180
deg
INCR
SET
.1
deg
NOTE
For
instruments with Option
002
and
006,
ks,
in
SHIFT FLOAT
2
OFF
rather
than
SHIFT FLOAT
1
OFF
in the step above, and
key
in
SHIFT DESTN
2
rather than
SHIFT DESTN
1.
3.
Adjust the oscilloscope vertical gain and sweep speed to view the nearly nulled 10 kHz output
from the Multifunction Synthesizer.
4.
On the Multifunction Synthesizer, press
AMPTD
then press the
0
or
4l
keys,
if
necessary, to
minimize the 10
kHz
signal on the oscilloscope.
NOTE
To get
a
feel
for
the nature
of
this measurement, press the amplitude
increment
keys
a
few times to un-null the
two
signals
being summed
and
observe the nature of the
signal
being monitored. Then re-null the
signal
and
proceed. 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
FREQ100kHz
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
0
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 9 4-31
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