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NOTES
(1)
The input signal levels
(S components) below 1 V
will limit the selectable ranges for S/N measure¬
ment.
Detailed information will be described later
in paragraph 4.8.
(2)
In principle,
the S/N key is pressed once more when
the frequency or amplitude of the S component
(in
this case, the signal output from the oscillator)
changes.
With a restriction that the S/N measure¬
ment is made using the internal oscillator, the
analyzer is designed so that the same operation as
the S/N key is repressed is executed internally
just after the frequency or amplitude setting key
strokes.
In manual ranging mode, however,
the S/N
meter range does not return to 0 dB as described in
step 39) .
(3)
The S component.is stored by charging a capacitor.
The stored value gradually decreases with time;
however,
its accuracy is not affected within three
minutes.
Repress the S/N key if the S/N ratio
measurement prolongs for three minutes or more.
(4)
As described above,
the oscillator does not provide
the normal output signal while the S/N key is on.
In this state,
the frequency or output amplitude is
indicated normally in the digital display.
The
display merely indicates the value within 1.5
seconds immediately after the S/N key is pressed.
When the oscillator of the analyzer is to be used
as an audio frequency oscillator only,
the LEVEL or
DISTN key of the MEASUREMENT keys (eT) must be kept
on.
The operations in the preceding.description
(oscillator frequency,
output amplitude,
level measurement,
distortion measurement, and
S/N measurement)
are basic to this instrument.
These operations
are called "normal operation" because setting of each operation is
done when necessary.
4-18
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