2.3
OUTPUT CHARACTERISTICS
The
output
characteristics are also dependent on
the
operating voltage.
Output
impedance: < 25
st,
120 V operation
<
70
st,
28
V operation
Maximum outpJJt
voltage:
32
V
RMS
120 V operation
4
V
RMS
28 V operation
Maximum
output
current: 1.5 mA peak 120 V operation
0.5 mA peak 28 V operation
If
these figures are exceeded, clipping of
the
signal occurs, and distortion
is
introduced. When
the
load on
the
amplifier
is
capacitive,
the
capacitive
current increases with frequency for a given
voltage. This effect means
that
distortion can arise
at
high frequencies when very long cables, with high
capacitance, are connected
to
the
output.
The effect
is
usually
not
noticed,
for
normal cable lengths,
as
shown
in
Fig.2.3.
Fig.2.3 shows
the
output
voltage for
the
4%
distortion level
of
the
signal,
versus frequency, with cable capacitance
as
a parameter.
Output
voltages
below
the lines given will produce less
than
4%
distortion.
100
50
Volts
RMS
20
10
0.5
0.2
0.1
8
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5
10
10
4
2Hz
5
10
5
2
{1.93
10
Fig.2.3. LImitations
to
the dynamic
range
of
the preamplifier due to
capacitive loading.
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