Patent US3906344A successfully refreshed from Google Patents.
US3906344A
Expired / Lapsed
US
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Oscilloscope having selectable input impedances
Assignee: Tektronix Inc
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Filing: 1974-04-04
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Granted: 1975-09-16
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Expires: 1994-04-04
Abstract
Abstract An oscilloscope having both high and low input impedances is disclosed. The oscilloscope includes an input stage having a single input terminal selectably connected to either a low impedance attenuator or a high impedance attenuator section through an input switch. An output of the input stage including the two attenuator sections of different impedance is selectably connected to the common attenuator section and an amplifier circuit through a switch which is preferably operated simultaneously with the above-mentioned input switch.
Inventors
- 👤 John Lindsey Addis
- 👤 Ronald Wayne Peltola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:06
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/08; G01R13/00; G01R13/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
An oscilloscope, comprising: a cathode-ray tube including vertical and horizontal deflection means for orthogonally deflecting the electron beam, vertical amplifier means for amplifying the input signal applied thereto and for driving said vertical deflection means, horizontal circuit means for generating sweep signals for driving said horizontal deflection means, a single input terminal, attenuator means including a plurality of selectable attenuators of different input impedance, wherein the impedance selected remains substantially constant over the attenuation range, and switch means operated by single operating means for connecting a selected attenuator to said input terminal and to the input of said vertical amplifier and at the same time disconnecting other attenuators from said input terminal and said input of said veRtical amplifier, said switch means and said attenuator means being housed together in a single unitary structure.
Claim 2
Dependent Claim
134 words
An oscilloscope, comprising: a cathode-ray tube including vertical and horizontal deflection means for orthogonally deflecting the electron beam, vertical amplifier means for amplifying the input signal applied thereto and for driving said vertical deflection means, horizontal circuit means for generating sweep signals for driving said horizontal deflection means, a single input terminal, attenuator means including a plurality of selectable attenuators of different input impedance, wherein the impedance selected remains substantially constant over the attenuation range, and switch means operated by single operating means for connecting a selected attenuator to said input terminal and to the input of said vertical amplifier and at the same time disconnecting other attenuators from said input terminal and said input of said veRtical amplifier, said switch means and said attenuator means being housed together in a single unitary structure.
Claim 3
Dependent Claim
24 words
An oscilloscope according to claim 1, wherein one portion of said attenuator means is common for all of said attenuators of different input impedance.
Claim 4
Dependent Claim
43 words
An oscilloscope according to claim 2, wherein the input impedance of said common attenuator portion is selected to the same input impedance as one of said plurality of attenuators, and impedance converting means are employed for said plurality of attenuators except said one.
Claim 5
Dependent Claim
25 words
An oscilloscope according to claim 1, wherein either one of said switches is a relay switch which is electrically actuated upon operating the other switch.
Claim 6
Dependent Claim
19 words
An oscilloscope according to claim 1, wherein indicator means is provided to indicate the impedance of said selected attenuator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |