Guarded switches for component scanner

Details Guarded switches for component scanner Guarded switches for component scanner

1984-11-28

1987-06-02

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Plural switches

307115, 307125, 324 99D, 324123C, H01H 6700

Patent

active

046706631

ABSTRACT:
A test voltage is applied through an array of "guarded" switches (58) to selected ones of a plurality of components to be measured. Each switch (58) comprises first and second input terminals (69, 72), first and second output terminals (70, 74), and a wire (76) interconnecting the second input and second output terminals (72, 74). The switch (58) is operable selectively in a first state interconnecting its first input and output terminals (69, 70) and in a second state interconnecting the second input and output terminals (72, 74). A buffer amplifier (88) couples the input signal from the first input terminal (69) to the wire (76) interconnecting the second and output terminals (72, 74) of the switch (58) as a "guard voltage" to prevent loading of the input signal by leakage resistances within the switch.

REFERENCES:
patent: 3464012 (1969-08-01), Webb
patent: 4190776 (1980-02-01), Podboronov et al.
patent: 4315211 (1982-02-01), Walsh
patent: 4375616 (1983-03-01), Keller et al.
patent: 4484086 (1984-11-01), Koppl

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