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