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Model 4277A
SECTION III
OPTION 002 COMPARATOR OPERATION
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1. Connect
the
Model
16064A
COMPARATOR/HANDLER INTERFACE to
the COMPARATOR/HANDLER INTERFACE
connector on the 4277A's rear-panel.
2. Connect
the
desired
test
fixture
to
UNKNOWN terminals.
3. Turn on the instrument.
4. Perform
OPEN
and
SHORT
Zero
Offset
adjustments as described in paragraph 3-51.
5. Set the front panel controls as appropriate
for the desired measurement.
6. Press the ENABLE key @ on the 16064A.
The LED lamp at the center of the key should
come on.
Note
If E16 is displayed or DISPLAY A, press
the ERASE button (2) on the 16064A to
erase previously stored limits.
7. Enter the high/low limits for L/C/ j Z I
or
D/Q/ESR/G.
8. Press the RUN key (s) on the i6064A.
The
comparator will then begin comparing all
measured values with the high/low limits
entered in step 6.
The appropriate LED
lamps—LOW, IN, HIGH~will be lit and the
number of the bin whose high/low limits fit
the measured values will be displayed on the
FREQUENCY/DC BIAS display.
Example:
If the bin limits listed in Tables A and B are
entered, the measured values listed in Table
C will cause the comparison results shown in
Table D.
Note
LOW and HIGH limits are inclusive;
that is, if the measured value is exactly
equal to the LOW or HIGH limit of a
bin, the measured value fits the limits
for that bin. Also, if a measured value
fits the limits of more than one bin (bin
limits overlap), the comparator selects
the bin with the lower number.
An
example follows.
Bin 1 : lOOpF to 200pF
Bin 2: 150pF to 250pF
Measured Value: i90pF
Selected Bin: Bin 1
Note
If the LOW/HIGH limits for D/Q/ESR/G
are not entered, or when the instrument
is set
to
HIGH SPEED L or HIGH
SPEED C, the IN lamp for D/Q/ESR/G
will
be
always
lit.
D/Q/ESR/G
comparison is not performed, however.
Figure 3-34. Option 002 Comparator (Sheet 1 of 7).
3-77
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