Model 8904A
Characteristic
Performance
Limits
Spectral
Purity
THD+N
-63
dBC
rmS
(0.07%)
-63
dBC
~IYIs
(0.07°/~)
-55
dBc
rms
(0.18%)
Performance Tests
Conditions
sine wave: including spurs: amplitude
>50
mVrms
into
50R
20
Ht
to
7.5
kHt:
30
kHZ
BW
7.5
to
20
kHt;
80
kHZ
BW
20
to
100
kHz:
750
kHz
BW
Performance
Test
5
SPECTRAL PURITY (EXCEPT OUTPUT
1
WITH OPTION
006)
Specification
Description
The total harmonic distortion plus noise (THD+N)
is
measured directly by a distortion analyzer. The
distortion analyzer removes the fundamental with
a
notch filter and measures the signal out of the
notch filter
and
the total input signal into the notch filter. THD+N is the ratio
of
these
two
voltages.
NOTE
This test does
not
verify spectral purity for Output
1
in
instruments with
Option
006
(balanced output). Refer to Performance Test
6
for
that
option.
However, if
the
instrument
has
Option
002
and
006,
perform
the
portion of
this test for Output
2.
Equipment
Audio Analyzer
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HP
8903B
Procedure
output
1
NOTE
If
the
instrument
has
an Option
002
and
006
combination, skip to step
4.
1.
On the Multifunction Synthesizer, press
SHIFT
PRESET.
After the instrument presets, key in
fl
(Channel Conf
ig.
)
NEXT
SHIFT
FLOAT
1
OFF
AMPTD
10
V
2.
Connect the
OUTPUTS
1
HIGH
output to the audio analyzer’s (non-floating) input. Terminate
the audio analyzer’s input in
50R
using a tee.
Performance Test
5
4-17
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