Agilent Technologies B1500A Training Manual page 53

Triaxial Cable for Non-Kelvin connection
Shield Capacitance
Guard Capacitance
Force Resistance
Shown above are typical capacitance and series resistance of the force line. If cables are too long,
high capacitance may cause the SMU to oscillate. Keep the force-guard cable capacitance less than
600 pF. Similarly, the guard-shield capacitance must be less than 5000 pF.
Note the rather high force resistance. Kelvin connections must be used to eliminate this cable error.
Shield (Ground)
Guard
16494A-001
(1.5 m)
900 pF
130 pF
160m ohm
5-33
Force
16494A-002
(3.0 m)
1800 pF
240 pF
320m ohm
Module 5
Basic Measurement