Keysight Technologies B1505A Handbook page 93

Step 7. Press Measurement Setup tab.
You can change measurement parameters in this page.
Step 8. Linear/Log sweep mode is set.
The parameter is set to "LOG25" which sweeps and measures 25 points per
decade between the Start and Stop value entered in the next step.
Step 9. VAR1 or primary sweep parameters are set: Both Ibase and Icollector are
set.
Please note that the ratio of Ic/Ib is specified in the data sheet specification
(typically it is 10), and the ratio of these sweep parameters is to be the same
as the specification condition. The ratio of the example is 10 as that is the
specification condition.
(Start: Ic/Ib=1 mA/100 µA, Stop: Ic/Ib=10 A/1 A)
Step 10. Pressing "Pulse" button opens "Pulse Setup" sub-window.
Step 11. Integration time in pulsed measurement can be set. Make sure the integra-
tion time is less than 1 ms considering the maximum pulse width for
HCSMU is 1 ms. We require more than 50 µs typically until the pulse is
settled in a higher current region, say more than a few amperes, and the
integration time is to be set less than the pulse width minus 50 µs.
Step 12. Pulse width can be set. Since the minimum pulse width of HPSMU is 500 µ
s and the maximum pulse width of HCSMU is 1 ms in 20 A range, the pos-
sible range for pulse width is between 500 µs to 1ms for HPSMU. HCSMU
can be set less than 500 µs, and it is effective for reducing the power dissi-
pation of the power BJT.
Step 13. Press Auto Analysis Setup tab.
Step 14. Set Line 1 function to extract the first parameter as shown in the example.
a. Check "Enable" and "Fix" box.
b. Set the Line Type to Gradient, set Gradient value to "0" and select Data
condition to draw a horizontal line on the measurement curve in the spe-
cific point where is decided by the Condition formula.
The Y axis data of the line is read later to display as a power BJT pa-
rameter.
c. Set detection condition parameter as Icollector and the value to 8 (A).
Step 15. Set Line 2 function to extract the second parameter in the same way as
shown in the step 14.
Step 16. Enable marker function and set the detection condition which indicates the
marker to locate on the measurement curve.
Step 17. Press Function Setup tab.
Step 18. This step extracts parameters from the Line drawn in step 14 and 15.
The @L1Y1 function returns the Y1 axis intercept value (X=0) of Line 1.
The @L2Y2 function returns the Y2 axis intercept value (X=0) of Line 2.
Since the gradient of the line is zero (i.e. horizontal line), this function de-
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