9-8 Agilent B1500 User’s Guide, Edition 7
If You Have a Problem
When You Perform Measurement
Voltage Measurement Error is Large
Voltage measurement error may be large because of the effects of the cable
resistance when forcing a large current.
To solve this problem:
• Use kelvin connections between SMUs and DUT. To cancel the effects of cable
resistance, co
nnect the sense line as close as possible to the terminal of the DUT.
SMU Oscillates for High-Frequency Device
Measurements
When measuring parameters of high-frequency devices, such as GaAs MESFETs or
high-frequency bipolar transistors, oscillation may cause measurement problems.
Normal measurement cannot be performed because of oscillation.
To solve this problem:
• For FETs, add resistive ferrite beads as close as possible to the gate.
• For bipolar transistors, add resistive ferrite beads as close
as possible to the base
or emitter.
• Make connection cables as short as possible. Long wires cause oscillation
because of th
eir large inductance.
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