Method and apparatus for amplifying a signal and test device...

Details Method and apparatus for amplifying a signal and test device... Method and apparatus for amplifying a signal and test device...

2011-04-19

2011-04-19

Nguyen, Ha Tran T (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With amplifier or space discharge device

C324S12300R, C330S260000, C330S271000

Reexamination Certificate

active

07928721

ABSTRACT:
An amplifier circuit is used in a multimeter to amplify signals applied between a pair of test terminals. A voltage applied to one of the test terminals is amplified by a first operational amplifier configured as a voltage follower. An output of the first operational amplifier is applied to an inverting input of a second operational amplifier configured as an integrator. An output of the second operational amplifier is connected to the other of the test terminals. A voltage generated at the output of the second operational amplifier provides an indication of the magnitude and polarity of the voltage applied to the first and second test terminals.

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