Agilent Technologies B1500A Podręcznik Użytkownika Strona 483

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Agilent B1500 Users Guide, Edition 7 9-9
If You Have a Problem
When You Perform Measurement
SMU Oscillates for Negative Resistance Measurements
If the DUT has negative resistance characteristics, SMUs may oscillate. Because the
positive feedback may be configured by the DUT and the SMUs.
To solve this problem:
For voltage controlled negative resistance device
Connect G in parallel with your DUT to cancel negative resistance. To
obtain an ou
tput I-V curve, use the following equation.
IY = I - G × V
For current controlled negative resistance device
Connect R in series with your DUT to cancel negative resistance. To obtain
an output I-V
curve, use the following equation.
VZ = V - R × I
If the resistance of the DUT is less than 1 MΩ, you can use a se
ries resistor
built into the SMU.
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