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38
3.5.24.
Q/D
potentiometer
—
Turn
the
Q/D
potentiometer
to
left-hand
stop
—
Check
that the
mark on
the control
knob
coincides with the
mark
on
the text
plate
—
Connect
to sockets
I
and E
a circuit
as
indicated
below
(fig.
19)
in
order to adjust
resistor
712A.
Cl
= 100
nF ±
1
%
tangS
<
2.10~ 4
R1
=
237
£2
+
1
%
metal
film
MR25
R2
= 7.15 kfi±
1
%
metal
film
MR25
Fig
19.
Adjusting
circuit
for resistor
7
12
A
—
Depress button
C
(button
D
not
depressed)
—
Set range switch
to position
xIO
r»F
—
Set
control
D/Q
to position
14
—
Adjust
capacitive
components
to
a
minimum
—
Adjust
bridge to
minimum
scale
deflection
with
resistor
633
-
Connect
to sockets
I
and E
a circuit as indicated
below
(fig.
20)
in
order to adjust
resistor
712B
R
3
Cl
= 100
nF±
1
%
tang.fi
<2.10"
4
j
C1
|
1
I
1
E
R3
*
23.7 kJ2
±
1
%
metal
film
MR25
0
1|
1
1
0
R4
=
750
kft
±
1
%
carbon
CR25
I
1
Fig
20.
Adjusting
circuit
for resistor
712B
MAM24
—
Follow
the
same
procedure
as
described
for
adjustment
of
resistor
712A,
exept
the following
two
points
—
Depress
button
D
—
Adjust
bridge
to
minimum
scale
deflection
with
resistor
632
3.5.3.
Testing the bridge functions
—
Depress
button
R
3.
5.3.1.
Range-resistor
check
—
Connect
for
each range
a
resistor
to
sockets
l-E
with
a
value of
lOx
the
corresponding range
indication.
Resistor tolerance:
<
0.1
%.
Example:
range
*
xl
kft
—
*
value
lOx
1
=
10
kft ± 0,1
%
—
Now
the bridge
must
be tuned
for
each range
position
—
Note
the
measured
results.
The
difference
between
the
measured
results
and
the
sample
values
should be
<
1
%.
3.B.3.2.
Linearity
check
of
the
scale
potentiometer
—
Set range switch to position xl kI2
—
Connect
standard
resistors
from
1
k£2 to
10
kJ2
in
steps
of
1
k£2
to sockets
l-E
—
Tune
the bridge
for
each
step
and check
that the
resistance
reading
does not
deviate
more
than the
specificied value.
3.
5.
3.3.
Indicator
check
—
Set range switch
to
position
xl
kfi
—
Connect
a
1
0
k£2-resistor
to sockets
l-E
—
Tune
the
bridge
—
If
detuning
the bridge
one
scale division,
the deflection of the
indicator
should be
>
0.2
scale
division
—
Depress button
SEARCH
—
If
right,
the
indicator pointer points to the
lower end
of the
marked
range
—
Set range switch to position
xIO
kS2
-r
If
right,
the
indicator pointer points to
the high.r
end
of the
marked
range.
—
Depress
button
L.
—
Set range switch to position xl
mH
—
Connect
a
coil
of
10
mH
to
socket
l-E
(limits
for quality factor
Q
of
this
coil:
between
3
and
6)
—
Depress
button
Q
—
Tune
the
bridge
—
Depress button
SEARCH;
if
right,
the indicator pointer points to the higher
end
of the
marked
range
—
Set range switch
to position
xl
0
mH
—
If
right,
the
indicator
pointer
how
points to the lower
end
of
the
marked
range
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