Performance Tests Model 8904A
Performance
Test
6
SPECTRAL PURITY (OUTPUT
1
WITH OPTION
006)
Characteristic
Specification
Description
Spectral
Purity
THD+N
Performance Limits
-46 dBC (0.56%)
-60 dBC
(O.lOo/o)
-63 dBC
(0.07%)
-55
d8c
(0.18°/0)
Conditions
Option 006; sine wave; including spurs;
amplitude
0.14
to
10
\/rms
into a balanced
6000
load
30 to 300
Hz;
30
kHz
BW;
amplitude
i1
Vrms
0.3 to
7.5
kHz;
30
kHz
BW
7.5
to
20
kHz;
80
kHz
BW
20 to
100
kHz;
750
kHz
BW
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 verifies
the
spectral purity of Output
1
in
instruments with Option
006.
If
the instrument
has
Optwn
002
(a second output), also perform
Performance Test
5.
Equipment
Audio Analyzer
...................................................................
HP 8903B
Feedthrough Termination,
600R
...................................................
HP
11095A
Adapter, BNC
to
Dual Banana Plug
(2
required).
................................
HP
1251-2277
Procedure
1.
On the Multifunction Synthesizer, press
SHIFT
PRESET.
After the instrument presets, key in
fl
(Channel
Config.
)
NEXT
SHIFT
FLOAT
1
ON
AMPTD
10
V
2.
Connect the Multifunction Synthesizer
OUTPUTS
1
HIGH
and
LOW
outputs to the audio
analyzer's floating inputs through a
600a
feedthrough termination. Use
two
BNC-to-dual-banana
plug adapters and
two
BNC-to-single-banana plug adapters (supplied with the Multifunction
Synthesizer) as necessary to maintain
a
floating output. (The HP
8903B
will also require
two
BNC-to-single-banana plug adapters.)
4-20
Performance Test
6
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