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1-1.
SCOPE
OF
SECTION
SECTION
1
OPERATION
This section contains information
and
instructions
necessary for the operation
of
the
Sound
Technology
Model
1710A
Distortion
Measurement
System. Included are
power
requirements,
cabling information
and
operating
instructions.
1-2.
I~TROOUCTION
The
Model
1710A
Distortion
Measurement
System
co111>1nes
a
flexible
ultra-low-distortion
sine-
wave
signal generator, a high-resolution automatic-measuring
total
harmonic
distortion
(THO)
analyzer,
and
an
accurate ac-level meter
in
one instrument. Pushbutton operation
permits the operator
to
quickly measure voltage
or
power
levels,
set
level,
and
then
measure
distortion.
The
generator section provides a pure sine-wave
oscillator
signal
for
testing
from
10
Hz
to
110
kHz.
The
generator output
is
direct
-coupled
(no
transformer)
and
is
balanced
and
floating
with respect
to
ground.
Either
side
can
be
grounded without
any
level change.
The
output
impedance
can
be
set
to
either
150
ohms
or
600
ohms
(except
for
levels
greater
than
+21
dBm),
and
discrete
calibrated
levels in 0.1
dB
steps
can
be
selected
from
+27.0
dBm
to
-90.9 dBm(decibcls
relative
to
1
milliwatt
into
600
ohms)
into
150-ohm
or
60Q-ohm
loads (17.32 V
rms
maximum).
The
level across
any
load used can,
in
addition,
be
directly
measured within the instrument.
An
indicating
off
switch disables the generator for
convenient
signal-to-noise
ratio
(SNR)
measurements.
The
analyzer section contains a tracking notch
filter
which
is
always tuned
to
the
generator's
frequency.
The
analyzer measures
total
harmonic
distortion
with a
sensitivity
ranging
from
100
percent
to
.01 percent
full
scale
, with automatic nulling
on
all
ranges.
Active
filters
may
be
selected
for
hum
and
noise suppression, enhanci ng the
measur
e
ment
resolution. A
differential
front
end
rejects
c011100n
-
mode
noise.
The
ac
signal-level
meter in the analyzer measures
ac
voltage,
or
power
in
dBm.
The
measurement
range
for
ac
voltage
is
0.1
millivolts
to
100
volts
full
scale
(30 microvolts
using the
RATIO
switch described in paragraph 1-25).
and
for
power
i~
-80
dBm
to
+40
dBm
full
scale (-90
dBm
using the
RATIO
switch described
in
paragraph 1-25). Ratio measure-
ments
with
100
dB
or
more
of
dynamic
range
can
also
·
be
made
.
1-3.
INPUT
POWER
REQUIREMENTS
The
Model
1710A
System
may
be
operated
from
nominal
115-volt (90
to
130)
or
230-volt
(180
to
260),
50
or
60
-
Hz
power
sources. A two-position
selector
switch
on
the
rear
panel
selects
the
nominal
voltage; before connecting the instrllllent
to
the
power
outlet,
check
that
the
selector
switch
setting
matches the voltage of the source.
The
Model
1710A
System
is
protected
from
ac
power
overloads
by
a fuse (lA, fast-blow)
located
in
a
cartridge-type
fuse holder
on
the
rear
panel.
1-4.
POWER
CABLE
The
International Electrotechnical
Commission
(IEC)
recommends
that
instrument panels
and
cabinets
be
grounded
to
protect operating
and
servicing personnel.
The
Model
1710A
system
is
equipped with
an
!EC-approved three-conductor
power
cable assembly which,
when
plugged
into
an
appropriate
outlet,
effectively
grounds the
unit.
1-5.
CONTROLS
ANO
INDICATORS
The
data sheet
at
the front
of
this
manual
illustrates
and
describes
briefly
the
Model
1710A
Distortion
Measurement
System's front panel controls
and
indicators.
The
following
provides additional explanatory information.
1-1
