Keithley 6220, Reference Manual

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E-8 Applications Model 6220/6221 Reference Manual
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Typical filter circuits
The basic passive components for a filter circuit are capacitors, inductors, resis-
tors, and ferrites. A ferrite inductor exhibits higher resistance at higher noise fre-
quencies.
Figure E-7 A shows a typical filter circuit when using the Model 622x with output
low connected to the inner shield of the triax connector. Figure E-7 B shows a typi-
cal filter circuit when using the Model 622x with Cable Guard connected to the
inner shield of the triax connector. Cable Guard is routed through the test box to
the DUT.
Figure E-7
Filter circuit examples
Guard
Ground / Lo
Hi
L R
C
Triax Out
(To DUT)
Triax In
(From 622x)
B) Guard on inner shield
Hi
L R
C
Triax Out
(To DUT)
Triax In
(From 622x)
A) Output Lo on inner shield
Lo
L R
Metal case
of filter box
Metal case
of filter box
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