Model
8904A
Performance
Tests
Characteristic Performance
Limits
Conditions
Summation
Option
001
Channel-to-Channel
fO.l
deg
or
30
ns
equal
signals
summed into one output;
Phase Accuracy whichever is hgher
0.1
Hz
to
100
kHz;
sine wave
,-
Performance
Test
9
CHANNEL-TO-CHANNEL PHASE ACCURACY (OPTION
001)
Specification
Description
Channel
A
and Channel
B
of
the Multifunction Synthesizer are nominally set to the same amplitude
but with
180
deg phase difference. The
two
channels
are
summed together internally
so
that the
two
signals in effect cancel each other. The output
is
viewed on an oscilloscope.
The amplitude
of
Channel
B
is fine adjusted to null the signal
as
much as possible. The phase
of
Channel
B
is
fine adjusted also to further
null
the signal. The amount
of
phase shift required to null
the signal
is
the phase error between the
two
channels.
NOTE
For
instruments with Option
002
(a
second output) and
006
(balanced
ou@ut), channel-to-channel phase accuracy
is
specified only
for
Output
2.
For
instruments with Option
006
but not Option
002,
channel-to-channel phase
accuracy
is
not specified.
Equipment
Oscilloscope
.
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HP
1740A or Tektronix
2235
Procedure
1.
Connect the Multifunction Synthesizer
OUTPUTS
1
HIGH
output to the oscilloscope’s dc coupled,
high-impedance input.
NOTE
For
instruments with Option
002
and
006,
connect the oscilloscope to
OUTPUTS
2
HIGH
rather than
OUTPUTS
1
HIGH
in the step above.
2.
On the Multifunction Synthesizer, press
SHIFT
PRESET.
After the instrument presets, key in
fl
(Channel
Conf
ig.
NEXT
SHIFT
FLOAT
1
OFF
FREQ
10
kHz
AMPTD
1
V
NEXT
FREQ
10
kHz
4-30
Performance Test
9
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