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Measurement Parameters: Cob Output capacitance
Application Test name: Cob
Application Test setup name: (My Favorite Setup -> Example_AT): Cob
Device used in the example: MJL4281AG
Connection inside the N1259A Test Fixture: Use the figure shown in this section
Application description:
Measures Base-Collector capacitance (Cob), and plots Cob-Vc characteristics.
Extracts Cob at the specified collector voltage.
For more accurate measurement, perform correction data measurement at the
measurement frequency before starting the capacitance measurement.
Connection inside the N1259A Test Fixture
Use the following connection inside the N1259A test fixture
Open the N1259A test fixture cover, and connect the test leads, SHV cable and SHV-
Banana Adaptor shown in figure 3-26 by following the step numbers shown in figure
3-27. The numbers of the procedure steps correspond to the numbers on the draw-
ing for connecting the test leads and SHV cables.
[PROCEDURE]
Step 1. Insert the power BJT (example: MJL4281AG) into the socket on the N1259A.
Make sure the device pin name matches the socket numbers shown in fig-
ure 3-27.
Step 2. Using test lead, connect the HVSMU1 Force to the DC Bias Input Force.
Step 3. Using test lead, connect the HVSMU1 Guard to the DC Bias Input Guard.
Step 4. Using a SHV cable and an adaptor, connect the MFCMU High output to the
terminal 2 Force (Collector) of the Inline Package Socket.
Step 5. Using a SHV cable and an adaptor, connect the MFCMU Low output to the
terminal 1 Force (Base) of the Inline Package Socket.
Close the N1259A fixture cover.
NOTE: If measurement is made with Opt.300 Module Selector, use the procedure
shown in Appendix 2.
3-1-8. Cob-Vc measurement
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