US3600670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical bridge system with leakage-resistance protection
Assignee: BLH Electronics Inc
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Filing: 1969-12-04
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Granted: 1971-08-17
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Expires: 1989-12-04
Abstract
Abstract The effects of leakage resistance in a precision measuring system are minimized by providing a guard strip for shielding the power input terminals from the low-level signal output terminals in an electrical connector, by grounding the center tap of the secondary of the power input transformer, and by both twisting and shielding the pairs of power input leads and signal output leads.
Inventors
- 👤 Donald A Senour
- 👤 Fred J Lingel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
G; G01; G01G; G01G3/00; G01G3/12; G01G3/14; G01G3/142; G01G3/1402; G01G3/1406; G01R; G01R17/00; G01R17/10; G01R17/105; H; H01; H01R; H01R13/00; H01R13/648; H01R13/658; H01R13/6591; H01R13/6592
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
Apparatus for minimizing the effects of leakage resistance comprising an electrical bridge circuit arrangement having a first pair of joining arm points and a second pair of joining arm points, interconnecting means connecting power input to said first pair of joining arm points and connecting signal output from across said second pair of joining arm points, said interconnecting means comprising a separable electrical connector which includes a male portion and a female portion each having an insulating base surface, first and second groups of pin connections disposed on the insulating base surface of said male portion for respectively connecting said power input and said signal output to and from said first and second pair of joining arm points, said groups of pin connections being disposed in alignment with and for interconnection respectively with first and second groups of aperture connections in the insulating base surface of said female portion, and means shielding said second group of pin connections from said first group of pin connections at the site of said insulating base surfaces, said shielding means comprising a grounded conductive metal guard extending between said first and second groups of pin connections at the site of at least one of said insulating base surfaces, whereby the effects of leakage resistance between said groups of pin connections are minimized.
Claim 2
Dependent Claim
218 words
Apparatus for minimizing the effects of leakage resistance comprising an electrical bridge circuit arrangement having a first pair of joining arm points and a second pair of joining arm points, interconnecting means connecting power input to said first pair of joining arm points and connecting signal output from across said second pair of joining arm points, said interconnecting means comprising a separable electrical connector which includes a male portion and a female portion each having an insulating base surface, first and second groups of pin connections disposed on the insulating base surface of said male portion for respectively connecting said power input and said signal output to and from said first and second pair of joining arm points, said groups of pin connections being disposed in alignment with and for interconnection respectively with first and second groups of aperture connections in the insulating base surface of said female portion, and means shielding said second group of pin connections from said first group of pin connections at the site of said insulating base surfaces, said shielding means comprising a grounded conductive metal guard extending between said first and second groups of pin connections at the site of at least one of said insulating base surfaces, whereby the effects of leakage resistance between said groups of pin connections are minimized.
Claim 3
Dependent Claim
121 words
Apparatus for minimizing the effects of leakage resistance as in claim 1, wherein arms of said electrical bridge circuit arrangement include electrical strain gage elements therein, and wherein said interconnecting means connecting power input to said first pair of joining arm points includes a center-tapped transformer, the center tap of a secondary winding of the transformer being grounded at the same ground potential as said metal guard, and the said power input being AC power applied to a primary winding of said transformer and coupled with said first pair of joining arm points from across said secondary winding, whereby the output of said electrical bridge circuit arrangement is a precision measurement with minimized error due to the effects of leakage resistance.
Claim 4
Dependent Claim
93 words
Apparatus for minimizing the effects of leakage resistance as in claim 2, wherein said AC input power appears at said first groups of pin connections and aperture connections, wherein said input power is applied to said primary winding from said first groups of pin connections and aperture connections and is applied to said first pair of joining arm points of said bridge circuit arrangement from across said secondary winding, and wherein said output from said second pair of joining arm points is applied to said second groups of pin connections and aperture connections.
Claim 5
Dependent Claim
74 words
Apparatus for minimizing the effects of leakage resistance as in claim 3, wherein said input power is applied to said primary winding from said first groups through a pair of twisted and shielded leads and said output is applied to said second groups through a pair of twisted and shielded leads, wherein said groups comprise pairs, and wherein said metal guard is a strip extending continuously between the first and second pairs of pins.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |