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Model
4342A
Section
III
Figure
3-l
5.
6.
7.
8.
9.
10.
11.
Frequency
Multiplier
Indicator:
The
Frequency
multiplier
indicators,
ad-
jacent
to the frequency
dial
scale,
light
and correspond
with
the settings
of the frequency
range
selector
@
pushbuttons.
FREQUENCY Scale:
The Frequency
scale
comprises
two scales
with
ranges
of
2.2 to 7.0 and 7 to 22 (1.0
to 3.2 and
3.2 to 10 for
Option
001).
One or the
other
of the scales
is automatically
illuminated
depending
on the FREQUENCY
RANGE selector
@ setting.
OVER LIMIT
Display:
The letters
"OVER
LIMIT"
are displayed
when the measured
Q value
exceeds
the
limit
value
set by
the Q LIMIT
control
0.
Measurement
Terminals:
These binding
post
terminals
facilitate
connection
of the unknown and the various
meas-
urement
aid accessories.
A simplified
terminal
circuit
schematic
is provided
by the
top panel
label.
Q Meter:
At
maximum meter
pointer
de-
flection,
this
meter
indicates
the Q
value
of the sample or of the measur-
ing
circuit
as well
as the optimum
tuning
point.
The outer
two scales
(0
to 100 and 0 to 30) are the Q readings.
The inner
two reverse
scales
(10 to 0
and 3 to 0) provide
hQ readings
when
making
AQ measurements.
Meter
scale
indicators
at the
left
end of scale
automatically
light
to indicate
the
appropriate
scale
(to read)
on the
se-
lected
Q/hQ
range.
Meter
Pointer
Adjustment
Screw:
This
adjustment
screw zero-sets
the meter
pointer
so it
is exactly
over the
zero
calibration
mark when the instrument
is off.
AQ ZERO Controls:
These coarse
and
fine
controls
adjust
the meter
indica-
tion
for
zero
(reference)
scale
in AQ
measurements.
This function
applies
only
to AQ measurements.
12.
L Scale:
This
dial
scale
allows
di-
rect
reading
of inductance
sample
values
at the "L"
frequency.
An "L"
scale
frequency
point,
common to and
useable
on all
frequency
ranges,
is
labeled
with
a blue
letter
on the FRE-
QUENCY scale
0.
The L scale
indi-
cates
the
inductance
value
of the un-
known when resonated
with
the tuning
capacitance
at the "L"
frequency.
13.
AC Scale:
This dial
scale
permits
the
reading
of the capacitance
of a
vernier
tuning
capacitor
from
-5pF to
+5pF in O.lpF
steps.
The actual
tun-
ing capacitance
is sum of the C Scale
@ and the AC Scale readings.
A small
change in the
tuning
capacitance
ad-
justment
point
resulting
from a
variation
in test
parameters
can be
accurately
read
from the spread
AC
scale.
14. C Scale:
This dial
scale
is for
read-
ing the capacitance
of the main tuning
capacitor
which may be varied
from
25pF to 470pF.
A
C scale
reading
is
exact
(calibrated)
when the AC scale@
is set to OpF.
15.
16.
17.
AC Dial
Control:
This dial
wheel
varies
the vernier
tuning
capacitor
and moves the AC Scale
0.
The con-
trol
employs
a string
drive
mechanism
which
facilitates
easy adjustment
of
vernier
capacitor.
L/C Dial
Control:
This dial
wheel
varies
the main tuning
capacitor
as
well
as moving
the
C scale
@ and L
scale
0.
Q/ AQ RANGE Selector:
These push-
buttons
select
the
desired
Q range
(either
30, 100,
300 or 1000 full
scale).
AQ button
enables
AQ measure-
ment and expands
Q resolution
by ten
times
(3,
10, 30 or 100 full
scale).
Figure
3-l.
Front
Panel Controls
(Sheet
2 of 2).
3-3
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