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4.8
S/N Measurement
a)
The S/N ratio can be measured by connecting the device to be
tested as
shown in Fig.
4-15.
b)
The
input level of
S
(signal)
component below 1 V requires the
input
level meter range
setting of 1 V or 0.3 V full
scale.
For
these low
input S level measurement,
the usable S/N indicator range will be
limited as
shown in Table
4-6.
The limitation also depends on the
use of either LPF,
30 kHz or 80 kHz.
Table
4-6
Limitation of S/N range
LPP
S/N indicator range
any
All ranges can be
selected.
INPUT LEVEL
METER range
3V - 100V
full scale
1 V full
scale
ON
All ranges can be
selected.__
OFF
90 dB range cannot be
selected.
03
v
.ON
All ranges can be
selected.
OFF
80 dB and 90 dB ranges cannot be
selected.
c) Additional limitations
should be considered for accurate S/N
measurement even
in the selectable ranges due to the residual noise
within the analyzer.
Tables
4-7 and 4-8
(indentical to Tables
2-3 and 2-4,
respectively
in the Specifications)
describes the
conditions.
Table 4-7
S/N measurement limit for unfloated input
(V in nns,
values with dB are
S/N)
_
Input range
>3V
IV
0.3V
Detection
S component
level
Es>lV
lV>Es>0.3V
0.3V>Es>0.1V
bandwidth BW
lOOdB
90dB
85dB
80kHz BW
5Hz-15.99kHz
90dB
85dB
75dB
500kHz BW
16kHz-159.9kHz
80dB.
75dB
60dB •
500kHz BW
■
i
4-33
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