초록 ▼

In a method for testing for probe calibration, a square-wave signal is applied to a probe and a cyclic probe output signal resulting therefrom is compared to a reference level at a plurality of points along one cycle of the output signal. The reference signal is iteratively increased or decreased un

In a method for testing for probe calibration, a square-wave signal is applied to a probe and a cyclic probe output signal resulting therefrom is compared to a reference level at a plurality of points along one cycle of the output signal. The reference signal is iteratively increased or decreased until it is less than or greater than a minimum or maximum peak magnitude of the probe output signal by a small amount. The probe is then determined to be calibrated according whether the magnitude of the output signal at each point is greater than or less than the reference level.

대표청구항 ▼

A probe calibration testing apparatus, comprising: means for generating a square-wave signal to be applied to a probe; means for generating a variable reference level; means for comparing an output signal from said probe with the reference level and for producing an output signal indicating whether

A probe calibration testing apparatus, comprising: means for generating a square-wave signal to be applied to a probe; means for generating a variable reference level; means for comparing an output signal from said probe with the reference level and for producing an output signal indicating whether or not the probe output signal exceeds the reference level; and control means for controlling said reference level to a level within a selected range of a peak level of the probe output signal, and for determining whether said probe is calibrated by repeatedly sampling the output signal from said comparison means. A method of testing calibration of a probe comprising the steps of: applying a square-wave signal to the probe to generate a probe output signal, each cycle of said square-wave signal having a high voltage portion and a low voltage portion; generating a reference voltage level lower than the lowest magnitude of said probe output signal during a given portion of each cycle thereof generated in response to the low voltage portion of each corresponding cycle of said square-wave signal; successively increasing said reference level by a selected amount and comparing said probe output signal magnitude with each successively increased reference level during said given portion of said output signal generated in response to said low voltage sqaure-wave cycle portion until said probe output signal magnitude is less than said reference level for at least a part of its said given portion; and determining said probe to be calibrated if said probe output signal magnitude is less than said reference level during substantially all of its said given portion.