Keithley 4200-SCS, Руководство пользователя

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3-46 Return to Section Topics 4200-900-01 Rev. K / February 2017
Section 3: Common Device Characterization Tests Model 4200-SCS User’s Manual
PulsePeriod Vgs pulse period. When using the Pulse IV setup with RBTs, use a
PulsePeriod 1000 x PulseWidth, to keep the pulse duty cycle
less than or equal to 0.1%. For most cases, it is best to use
200 E-6, which will allow an appropriate duty cycle across the
range of supported 40-150 ns pulse widths.
GateRange Scope card gate voltage range. Use 0 for autoranging, or a specific
value for a fixed range. The scope range is centered around
zero, so the 5 V range on the scope covers -2.5 V to +2.5 V.
As an example, for a 3 V signal, use GateRange = 10 (-5 V to
+5 V), not 5 (-2.5 to +2.5 V). Available ranges for the scope
card: 0.05, 0.10, 0.25, 0.5, 1, 2, 5, 10 V.
DrainRange Scope card drain voltage range. Use 0 for autoranging, or a specific
value for a fixed range. To calculate an appropriate fixed
range, use DrainRange = (Estimated Id) x 50 x 2. See above
for valid scope card ranges.
AverageNum Number of pulses to average. For larger currents, Id > 500
µA, AverageNum = 10-25 is usually sufficient. For smaller Id,
use 50-100. Larger values provide minimal additional
improvement. All pulse IV tests have this setting, which
controls how many pulses are used to return a result, not how
many pulses are sent to the DUT.
LoadLineCorr Turns drain side load line correction on or off. This is similar to the
vds-id-pulse and vgs-id-pulse tests and is a routine to ensure
that the correct Vd is provided to the drain DUT terminal,
regardless of the amount of Id flowing through the DUT.
VPUID Pulse card identification string: VPUID = VPU1.
GateSMU SMU for DC Vg. Default is SMU1, but any other available SMU may be
used.
DrainSMU SMU for DC Vd. Default is SMU2, but any other available SMU may be
used.
Tips for using Pulse IV
• Confirm connection: Use scope-shot as the first test after touching down on a
device to confirm that there is proper connection to the DUT, before running
PulseIVCal or any pulse tests.
• Always calibrate after any setup changes (new probe tips or manipulators, cable
replacement).
• Proper pulse IV performance can be verified by testing a device that does not
exhibit any selfheating or charge trapping effects. The 8101-PIV Test Fixture and
SD-210 DUT provide good DC and pulse correlation for Id < 10 mA and Vd < 5 V.
For Id < 1mA, set AverageNum = 0 to use the Adaptive Filtering. If a fixed number
for AverageNum is desired, use AverageNum = 2000 for Id < 500 µA.
• Pulse IV measurements have less resolution and sensitivity than typical DC results,
so test parameters, such as averaging or smaller steps sizes, and post-test