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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