Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1986-07-18
1987-10-20
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 73R, 324158T, 364579, 364580, G01R 3126, G01R 1702
Patent
active
047017015
ABSTRACT:
An instrument for measuring the characteristics of a circuit element has a plurality of SMUs for applying test signals to the terminals of the circuit element and measuring the resulting output signals. A control circuit compares the output signal value to a reference value while varying the test signals. The test signal is varied by an integrator which operates in two modes, a search mode with no feedback to quickly bring the output signal to the approximate value of the reference, and a feedback mode to hold the output signal at the reference value while a measurement is made. The parameters for setting stable operating conditions for the feedback loop with the circuit element being tested are stored in a memory of the control circuit.
REFERENCES:
patent: 3988672 (1976-10-01), Cowart
patent: 4517512 (1985-05-01), Petrich et al.
Hewlett-Packard Journal, Takagi et al., "Programmable Stimulus/Measurement Units Simplify Device Test Setups", Oct. 1982, pp. 15-20.
Baker Stephen M.
Hewlett--Packard Company
Strecker Gerard R.
Williams James M.
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