(4) Connect
the
precision
rms voltmeter
to the
113's (2)
Set the II3'S
A
input
COUPIIDQ
SWITCII t0
DC, the B
outputjack.
(5)
Adjust R221 for exactly
the
same
reading
as set
in
step (3). NOTE: This
adjustment trims
the gain
only
in
the
2 k,
5
k,
and
10
k positions
of
the Gain switch.
coupling switch to GND,
the HF
Rolloff
switch
to
300
switch to
10 (cal).
(3) Monitor the
output
of the signal
generator
with the
precision rms voltmeter; the
attenuator must remain
connected
to the
signal generator
so that
a
change of
5'7 LOW
Flag?/|l;EmgXT|::0§LOFF
load
does
not
occur that
would
change the signal
O
amplitude. Adjust
the_rms
voltage
to 1 V
(exactly)
@
300
kHz.
(1) Set the
HF
Rolloff
control
to
100
kHz, and
set the
LF
Rolloff
to DC.
(4)
Connect
the precision
rms
voltmeter
to the
Model
113's
output jack.
(2)
Connect
the signal generator
to the
10:1 attenuator,
and connect
the attenuator
output to the Model
113's
(5) Adjust
C26 (en the |_||: Reueff
SW;-(eh) to preduee
e
A
input.
voltmeter
reading
of 0.707
V
rms.
(3) Set the A coupling
switch
to
DC,
the
B
coupling
switch
to GND,
and
the gain
switch
to 10.
5'9 BATTERY
TEST CALIBRATE
(1) Set the
Power
switch to
OFF
(pushbutton
OUT)
and
(4)
Monitor
the 113's
output with
the precision rms
the BATTERY
-|-EST tOgg|e
switch to either ~+~
or
voltmeter.
"—".
If the BATTERY
TEST
toggle
switch
is left in
the
center (off)
position, the
external supply
will be
(5) Adjust the
signal generator
to produce a reading of 1
shorted
out
V rms
@
10
kHz.
(2)
Connect
the
negative terminal of
the variable
dc
(6) Set the
|_F Rollgff control
to 1 kHz_
supply
to
the
brown lead of the
Battery Test lamp.
(7) Adjust
C200 to obtain exactly
the
same
voltage
(3)
Connect the positive
lead
of the
supply
to terminal
reading
as in step
(5) above.
#37 of the PC board‘
(4)
Slowly
adjust the
supply
to the point
where
the lamp
5.8
HIGH
FREQUENCY
ROLLOFF
Comesm
COMPENSATION
CAUTION:
DO NOT
EXCEED
13
V
DC.
(1)
Connect
the
10:1,
attenuator to the
output
of the
(5)
If
necessary,
adjust
R309 until the test lamp comes on
signal generator,
and
connect
the
output
of
the
at
11 V (i0.1 V) dc.
The
lamp should not come
on
attenuator
to the Model
113's
A
input.
below 10.7 V dc.
SECTION VI SAFETY
NOTICE
WARNING!
POTENTIALLY
LETHAL
VOLTAGES
ARE PRESENT
INSIDE
THIS APPARATUS.
THESE SER-
VICE
INSTRUCTIONS
ARE FOR
USE
BY
QUALIFIED
PERSONNEL
ONLY.
TO
AVOID ELECTRIC
SHOCK,
DO NOT PERFORM
ANY SERVICING
OTHER THAN THAT
CONTAINED IN
THE OPERATING
INSTRUC-
TIONS
UNLESS
YOU ARE
QUALIFIED TO
TO
SO.
Any
adjustment,
maintenance
and
repair
of
the opened
apparatus
under
voltage
shall be avoided as far as
possible
and,
if
unavoidable,
shall be carried
out
only
by
a skilled person
who
is aware
of
the hazard
involved. When
the
apparatus is
connected
to a power
source,
terminals
may be
live, and
the
opening of
covers
or
removal
of
parts
is
likely
to expose
live parts.
The
apparatus
shall be
disconnected from all
voltage
sources before
it is opened for
any adjustment,
maintenance,
or
repair. Note
that capacitors inside
the
apparatus
may
still
be charged
even if the ap-
paratus
has
been
disconnected from all
voltage
sources. Service
personnel are thus advised to
wait
several
minutes
after
unplugging
the
instrument
before
assuming
that
all
capacitors are discharged. If
any
fuses
are replaced,
be sure
to replace
them
with
fuses
of
the
same current
and
voltage
rating
and
of
the
same
type.
The use
of
makeshift
fuses and
the
short-circuiting
of
fuse
holders are prohibited.
V-2
kHz, the LF
Rolloff
switch to
DC, and set the
Gain \
\
I
(4)
Connect
the
precision rms
voltmeter
to
the
113'5
output
jack.
(5)
Adjust
R221 for exactlv
the
same reading
as
set
in
step
(3). NOTE: This
adjustment
trims
the
gain only
in
the
2 k, 5 k, and
10
k positions
of
the
Gain switch.
5.7
LOW
FREQUENCY ROLLOFF
COMPENSATION
(1)
Set
the
HF Rolloff
control
to
100
kHz, and
set
the
LF
Rolloff
to
DC.
(2)
Connect
the
signal
generator
to
the
10:
1
attenuator,
and
connect
the
attenuator
output
to
the
Model 113'5
A
input.
(3)
Set
the
A coupling switch
to
DC, the B coupling
switch
to
GND, and
the
gain switch
to
10.
(4)
Monitor
the
113's
output
with
the
precision rms
voltmeter.
(5)
Adjust
the
signal
generator
to
produce
a reading
of
1
V rms
@ 10 kHz.
(6)
Set
the
LF
Rolloff
control
to
1 kHz.
(7)
Adjust
C200
to
obtain
exactly
the same voltage
reading as
in
step
(5) above.
5.8 HIGH FREQUENCY ROLLOFF
COMPENSATION
(1)
Connect
the
10: 1
attenuator
to
the
output
of
the
signal generator, and
connect
the
output
of
the
attenuator
to
the
Model
113's
A input.
(2)
Set
the
113'5 A
input
coupling switch
to
DC,
the
B
coupling switch
to
GND,
the
HF Rolloff switch
to
300
kHz,
the
LF Rolloff switch
to
DC, and set
the
Gain
switch
to
10
(cal).
(3) Monitor the
output
of
the
signal
generator
with
the
precision rms
voltmeter;
the
attenuator
must
remain
connected
to
the signal
generator
so
that
a change
of
load does
not
occur
that
would
change
the
signal
amplitude.
Adjust
the.rms
voltage
to
1 V (exactly) @
300
kHz.
(4)
Connect
the
precision rms
voltmeter
to
the
Model
113's
output
jack.
(5)
Adjust
C26 (on
the
HF Rolloff switch)
to
produce
a
voltmeter
reading
of
0.707
V rms.
5.9 BATTERY TEST
CALIBRATE
(1)
Set
the
Power switch
to
OFF
(pushbutton
OUT) and
the
BATTE
RY
TEST
toggle switch
to
either
"+"
or
"-".
If
the
BATTERY
TEST
toggle switch
is
left
in
the
center
(off) position, the
external
supply will be
shorted
out.
(2)
Connect
the
negative terminal
of
the
variable
dc
supply
to
the
brown
lead
of
the
Battery
Test
lamp.
(3)
Connect
the
positive lead
of
the
supply
to
term
inal
#37
of
the
PC
board.
(4) Slowly
adjust
the
supply
to
the
point
where
the
lamp
comes
on.
CAUTION: DO NOT EXCEED
13
V DC.
(5) If necessary, adjust R309 until
the
test
lamp
comes
on
at
11
V (±0.1
V)
dc.
The
lamp
should
not
come
on
below 10.7 V dc.
SECTION
VI
SAFETY NOTICE
WARNING! POTENTIALLY LETHAL VOLTAGES
ARE
PRESENT INSIDE THIS APPARATUS. THESE
SER·
VICE INSTRUCTIONS
ARE
FOR
USE
BY
QUALIFIED PERSONNEL ONLY.
TO
AVOID ELECTRIC SHOCK,
DO
NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED
IN
THE OPERATING INSTRUC·
TIONS UNLESS
YOU
ARE
QUALIFIED
TO
TO
SO.
Any adjustment, maintenance and repair
of
the opened
apparatus under voltage shall
be
avoided
as
far
as
possible and,
if
unavoidable, shall
be
carried out only
by
a skilled person who is aware
of
the hazard involved. When the apparatus is connected to a power
source, terminals may
be
live, and the opening
of
covers or removal
of
parts is likely
to
expose live parts.
The apparatus shall be disconnected from all voltage sources before
it
is opened for any adjustment,
maintenance, or repair. Note that capaCitors inside the apparatus may still
be
charged even
if
the ap·
paratus has been disconnected from all voltage sources. Service personnel are thus advised to wait
several minutes after unplugging the instrument before assuming that all capacitors are discharged. If
any fuses are replaced, be sure to replace them with fuses
of
the same current and voltage rating and
of
the same type. The use
of
makeshift fuses and the short-circuiting
of
fuse holders are prohibited.
V-2
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