Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1977-08-24
1978-08-29
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
340661, G01R 1916, G01R 3102
Patent
active
041106873
ABSTRACT:
A logic probe includes a first lamp for indicating an input voltage level above a first predetermined magnitude or upper threshold, a second lamp for indicating an input voltage below a second predetermined magnitude or lower threshold, and a pulse lamp for indicating the change in the input voltage level. Circuit means are provided to control the operation of the third or pulse lamp so that the lamp operates in accordance with the position of a selector switch. When the switch is in a first position, the pulse lamp will operate in response to a change in the input voltage level through either one of the thresholds, and when the switch is in the second position, the pulse lamp will operate only if the input voltage level transitions both thresholds within a predetermined time.
REFERENCES:
patent: 3341816 (1967-09-01), Davis et al.
patent: 3544983 (1970-12-01), Wallace et al.
patent: 3619775 (1971-11-01), Naylor et al.
patent: 3628141 (1971-12-01), Union et al.
patent: 3673588 (1972-06-01), Riff
patent: 3742351 (1973-06-01), Palmer et al.
patent: 3838339 (1974-09-01), Brandt
patent: 4005365 (1977-01-01), Berger et al.
Czechlewski et al., Pulse and Level Detector Circuit, Western Electric Tech. Dig. No. 35, Jul. 1974, pp. 11-13.
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