Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1985-12-04
1988-06-14
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
307520, 330 2, G01R 2700
Patent
active
047514558
ABSTRACT:
Apparatus and method for performing low-frequency noise measurements on active devices such as operational amplifiers, instrumentation amplifiers and the like. A device under test is settled thermally in a short, controlled interval. The device under test is placed in a test fixture within a closed housing which shields against air flow. A substantial heat sink is urged against the device under test while a pre-heat circuit preheats the device for about 1-2 seconds by forcing it to consume a predetermined amount of energy. The voltage output of the device under test is supplied to a band-pass filter which includes a high-pass filter having a single dominant pole whose frequency may be varied. A control circuit smoothly moves that pole from a first, higher frequency of about 50 Hz to a second, lower frequency of about 0.1 Hz in an interval of only 3 seconds or so, rapidly settling the filter.
REFERENCES:
patent: 3541462 (1970-11-01), Sarkisian et al.
patent: 3619780 (1971-11-01), Hoeks et al.
patent: 3832642 (1974-08-01), Helgeland
patent: 3842346 (1974-10-01), Bobbitt
patent: 3863165 (1975-01-01), Egawa et al.
patent: 4045733 (1977-08-01), Dolan et al.
patent: 4114096 (1978-09-01), Chinery
patent: 4460868 (1984-07-01), Schmitt et al.
patent: 4604572 (1986-08-01), Horiuchi et al.
patent: 4659996 (1987-04-01), Nadir
Analog Devices Inc.
Eisenzopf Reinhard J.
Snow Walter E.
LandOfFree
Low frequency noise measurement system using sliding pole for fa does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low frequency noise measurement system using sliding pole for fa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low frequency noise measurement system using sliding pole for fa will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-506964