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SECTION III
Model 4277A
3-26. TEST FREQUENCY
3-27. There are six test frequency ranges, as
listed in Table 3-7. Frequency accuracy is 0.01%
of the value displayed on the FREQUENCY/DC
BIAS display.
Table 3-7.
Test
Frequency
Ranges
and
Resolution
Test Frequency Range
Resolution
lO.OkHz - 20.0kHz
lOOHz
20.0kHz - 50.0kHz
200Hz
50.0kHz -
lOOkHz
500Hz
lOOkHz »
200kHz
IkHz
ZOOkHz -
500kHz
2kH2
500kHz - l.OOMHz
5kHz
3-28. TEST SIGNAL LEVEL
3-29. The 4277A has two test signal levels:
HIGH (IVrms) and LOW (20mVrms).
Accuracy
for each level is listed in Table 3-8. The output
impedance of the test signal source is 100n±10%,
so the voltage across the DUT depends on the
DUT's impedance. Refer to Figure 3-3.
Table 3-8. Test Signal Level Accuracy
3-30.
MEASUREMENT RANGE
3-31.
Measurement range depends on the test
frequency. The ranges which can be selected at
each test frequency and the range resistor used
on each range are shown in Figure 3-5.
Each
range allows a 100% overrange of the 10000 full
scale counts (maximum 19999 counts).
Figure
3-4 shows the number of display digits for each
measurement functions.
Measurement range is
selected by the LC I Z I RANGE keys. When the
LC I Z I
RANGE control is set to AUTO, the
optimum range is automatically selected for
each
measurement.
Manual
ranging
is
also
possible.
When
an
inappropriate
range
is
selected, OF or UF is displayed on DISPLAY A
or DISPLAY B.
Vt =
Zl
100 +
Zl
Vosc
where,
Voscs Oscillator Level
(1 Vrms or 20m Vrms)
Vt :
Test Signal Level
Zl:
DUT Impedance
Figure 3-3. Equivalent Circuit of the Test Signal Source.
3-16
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