Table of Contents
Advertisement
TJIONEEfiI
MEASUREMENT
OF AMPLIFIER
GAIN
Amplifier
gain is expressed
by the following formula:
VOLTAGE GAIN (Av)
=
qutput
voltage
lnput
voltage
or Av (dB)
=
Output
level
(dB)
-
Input
levet (dB)
MEASUREMENTS
1.
Connect
the
SD-1100's OSCILLATOR OUTPUTS
to
the
INPUTS 1 on the
front
panel and
to the
amplifier,s AUX
inputs.
Connect
the
amplifier's
speaker
outputs
to
the
HIGH LEVEL inputs on the
rear panel
of
the
SD-1100,
and set the HIGH/LOW selector switch to HIGH (Fig. 26).
2.
Read
the
signal levels
at
the time the FRONf-nnan
SELECTOR SWITCH is
set
to
FRONT and at the time the
switch
is set
to REAR.
3.
For
instance,
if
the
reading
is - 10dB
with
the
FRONT-
REAR
SELECTOR SWITCH set
to
FRONT,
and -
bdB
with
the SWITCH
set
to
REAR, the gain can be
obtained
as
follows:
Gain
(dB) =
(-5
dB)
-
(-10
dB) +
*
20 dB = 2b dB
*
Fixed attenuation value for rear HIGH LEVEL input.
NOTE:
For
measuring
gain
of a
high
sensitive
amplitier,
set
the
SWITCH
in
Fiq.
25
to
"b"
posirlon and
use rhe
following
formula:
Gain (dB)
=
(Level
of
signal
supplied
to
the
H
IGH
LEVEL
INPUTS
of
rear panel)
_
(Levei
of
signal supplied
to
the
INpUTS on
the
front
panel)
+
60d8.
With thE
OSCI
LLATOR
FREOUENCY
CONTROL
KNOB set
to
SWEEP
AUTO, and
reading
the
REAR
INPUT
LEVE
L,
you
can
measuTe
gain
in
the
whote
2OHz
to
2OkHz
ranqe.
oooo
-@-
l.@
@@@@
@@@@
REAR PANEL OF
SD.1 lOO
AMPLI
FIER OR
RECEIVER
DUMMY LOADS
(8O)
F
is.
26
Advertisement
Table of Contents
