Fisher RS-1060 - Recommended Test Equipment; Harmonic Distortion Test

RECOMMENDED TEST
EOUIPMENT
The following
test
equipment
is recommended
to
completely
test and align
the
Receiver.
.
Line Voltage
lsolation Transformer.
o
Two
(2)
Load
Resistors.8-ohms,250Watts
o
AC
DC
Multimeter.
(Miriimum
Rating)
.
Accurately
Calibrated
AC
Voltmetey.
o
Low-Distortion
AM-FM Signal Generator
.
Oscilloscope
(Flat
to
'l
00 KHz
Minimum)
o
10.7
MHz
Sweep
Generator
a
Low-Distortion Audio
Sine-Wave Generator
o
Multiplex Generator
.
Harmonic
Distortion Analyzer
.
455 kHz Sweep
Generator
HARMONIC DISTORTION
TEST
'
CAUTION:
Limit the
following
tests to
no
more
than
ten
minutes
each. Use 8-ohm
resistors
with
a
minimum
power
rating
of
250
watts when
connecting a
load
across the
SPEAKERS terminals.
CONTROLSETTINGS:
ONE
CHANNEL
DRTVEN:
Unplug the AC
power
cord
and set the
front
panel
controls
1)Connect
a
low
distortion audio
generator
to LEFT
AUX
irs
iuiivv"S,
lN jack
Set
oenerator
frequency
to t kHz and output
TONE controls
and BALANCE
controls
to
center
positions
to minimum.
POWER sfvitch to OFF
2)
connect an 8-ohm load
resistor
between
SPEAKERS
i
SPEAKERS
switch to
PHONES
MAIN
LEFT
and COM terminals.
FUNCTION
switch
to
AUX
Connect
a
Harmonic
Distortion
analyzer and an AC
HIGH
&
LOW,FILTER, MONO
MODE,
LOUDNESS
CON-
VTVM
in
parallel
across the
Sohm load.
TOUR
and TAPE MONITOR
switch
toOFF and
SOURCE
3) Connect the
AC
power
cord
and set
SPEAKERS
switch
VOLUME
control to
MINIMUM
position
to
MAIN.
Turn VOLUME
control
to
MAX.
LEFT CHANNEL
DRIVEN
4) Increase
generator
output
for
RS-1060
125W
RMS
(31.6V
across the 8-ohm load)
RS-1080
170W
BMS
(36.8V
across the B-ohm load)
Harmonic
Distortion
Analyzer
should
measure
approxi-
mately
0.1o0 distortion.
5)
Repeat
steps
'l
through
4 for R
IGHT
CHANN
E
L.
BOTH CHANNELS
DRIVEN
Connect
B-ohm
load
resistors
across LEFT
and
RIGHT
MAIN
SPEAKERS terminals
Push
down
"MONO"
sryitch.
Adjusl
generator
output and
"BALANCE"
control
for RS-'1060:
125W/RS 1080: 170W
at Leitand RightChannels
(RS
1060:31.6V
/RS-1ß0:
36.8V) across
the 8-ohm
loads. Harmonic
Distortion
Analyzer
should
measure
approximatelv 0.1o/o
distortion a1
each channel.
-a
_