Steven Wayne Swift

US Patent:

6392402, May 21, 2002

Filed:

Jul 30, 1998

Appl. No.:

09/126987

Inventors:

Steven Dennis Swift - Seattle WA

Assignee:

Fluke Corporation - Everett WA

International Classification:

G01R 1500

US Classification:

324132, 324115, 324142

Abstract:

An rms converter accommodates incoming signals of large crest factor by using an amplifier having a transfer function of non-uniform slope. The amplifier has a lower gain for larger signals. The output of the amplifier is converted to digital voltage values. The non-uniform gain of the amplifier is compensated for in digital calculations of the rms value. The invention produces accurate rms measurements by accurately measuring lower incoming signal voltages while still accommodating high peak voltages. The invention also reduces the dynamic range requirements for the analog to digital converter.

US Patent:

54184649, May 23, 1995

Filed:

Jul 26, 1993

Appl. No.:

8/097439

Inventors:

Steven D. Swift - Seattle WA

Assignee:

John Fluke Mfg. Co., Inc. - Everett WA

International Classification:

G01R 3102

US Classification:

324537

Abstract:

An improved open circuit detector for testing a thermocouple for an open circuit condition. The detector includes a generator for providing and sourcing a tone signal to the thermocouple, wherein the tone signal has a known frequency and amplitude. A monitor analyzes the amplitude of a particular frequency component of a tone signal across the thermocouple. If the amplitude of the particular frequency component exceeds a predetermined threshold, an output is provided for indicating an open circuit condition for the thermocouple.

US Patent:

50868780, Feb 11, 1992

Filed:

May 23, 1990

Appl. No.:

7/527758

Inventors:

Steven M. Swift - Sumner WA

International Classification:

F16N 730

US Classification:

184 552

Abstract:

A lubrication system to lubricate tools and workpieces, where a metal part is being formed, to eliminate most of the friction, so little heat will be generated, and therefore coolants will not be required, centers on the modification of an air line lubricator, originally designed for internally lubricating compressed airflow driven pneumatic tools. The modification commences with the installation of an oil and overall pressurized airflow pick up passageway structure being arranged within the housing of the air line lubricator, having a continuous uniform diameter, to direct the oil and overall pressurized airflow from near the bottom of a pre-departure mixing basin, up to the pressurized air exit of the housing, and then through this pressurized air exit of this then modified air line lubricator. The continuation of a passageway for the oil and the pressurized airflow remains at the continuous uniform diameter beyond the pressurized air exit of the housing, through valves, tees, and into the entries of respective nozzles. This continuous uniform diameter of the passageway thereby avoids any build up of oil in puddles, which would othterwise possibly prevent the uniform continuous delivery of oil to adequately lubricate the place, where a metal piece is being formed by the moving contact of a forming tool, and also thereby avoids any large delivery of oil, or alternately no delivery of oil, if the modified air line lubricator is accidentally tipped when in operation.

US Patent:

44451113, Apr 24, 1984

Filed:

Sep 15, 1980

Appl. No.:

6/187442

Inventors:

Steven D. Swift - Seattle WA
Jonathan J. Parle - Seattle WA
David A. Gunderson - Everett WA

Assignee:

John Fluke Mfg. Co., Inc. - Everett WA

International Classification:

H03K 1302

US Classification:

340347CC

Abstract:

Bi-polar electronic signal converters, such as analog-to-digital or digital-to-analog converters, with a single polarity accurate reference source are disclosed. In one polarity direction, the accurate reference source is used in a conventional manner to transform the signal to be converted from one form (e. g. , analog) to the other form (e. g. , digital). In the other polarity direction, an inaccurate reference source is used in a similar conventional manner to convert the signal from one form to the other form. Periodically, the accurate and the inaccurate reference sources are compared to determine a correction multiplier. The correction multiplier is used during conversions using the inaccurate reference source to compensate for the inaccuracy of the inaccurate reference source.

US Patent:

59307455, Jul 27, 1999

Filed:

Apr 9, 1997

Appl. No.:

8/840086

Inventors:

Steven D. Swift - Seattle WA

Assignee:

Fluke Corporation - Everett WA

International Classification:

G01D 300

US Classification:

702190

Abstract:

A front-end architecture is provided for a measurement instrument having a single path for the input signal for conversion into digital samples. A signal conditioner may be coupled via a pair of test leads across a voltage source, current source, or component to develop an input signal. The input signal is provided to a sampling system, which comprises a sigma-delta converter followed by a decimation filter, which over-samples the input signal to produce a continuous stream of digital samples. The digital samples are provided to a set of digital extraction filters, each digital extraction filter having a structure and transfer function adapted for extracting a measurement parameter from the stream of digital samples. Parameter extraction is performed on a continuous basis so that the digital samples and the resulting digital measurement values arrive in a continuous stream. Extracted parameters include the d. c.

US Patent:

56989849, Dec 16, 1997

Filed:

Jan 30, 1996

Appl. No.:

8/594065

Inventors:

Erik R. Little - Seattle WA
Steven D. Swift - Seattle WA
Greg S. Gibson - Bothell WA

Assignee:

Fluke Corporation - Everett WA

International Classification:

G01R 3500

US Classification:

324601

Abstract:

An adaptive digital filter is provided to obtain improved measurement accuracy in an electronic instrument which has a front-end circuit for coupling to an input signal to be measured. An analog to digital converter converts the input signal received through the front-end circuit into a stream of measurement values during the measurement phase. The stream of measurement values are then provided to the adaptive digital filter which mathematically operates on them to remove the frequency response effects of the front-end circuit in a process of convolution in the time domain using a set of digital filter values obtained during the calibration phase. Because the frequency response requirements of the front-end circuit have been eased with the addition of the adaptive digital filter, a simpler front-end circuit with fewer components and with no need for manual adjustment may be employed in electronic instruments.

US Patent:

53336402, Aug 2, 1994

Filed:

May 24, 1993

Appl. No.:

8/067728

Inventors:

Steven M. Swift - Sumner WA
Jon C. Houghton - Auburn WA

International Classification:

F16N 730

US Classification:

137262

Abstract:

A flow divider, i. e. a splitter, to receive flow through an input port, is arranged in respective embodiments, with each embodiment respectively dividing flows, with each flow comprising a combined flow of a substance, consisting of multiple small units, and a gas flow under pressure, with the energy of the gas flow moving all the multiple small units of the substance throughout the flow divider for delivery therefrom through outlet ports thereof. In one embodiment, a housing has an input portion and an output portion, with the input portion having a central input port extending from the exterior into the interior thereof, and an interior recess to receive a seal, and with the output portion having a centered cavity to receive a centered shaft and a disc rotor on the shaft, and outlet ports extending from the centered cavity to the exterior of the housing. After installing the seal, shaft, and disc rotor, the housing portions are secured together. The driving power of the disc rotor is derived from the energy of the flow of the gas under pressure, by providing turbine blades on the disc rotor.

US Patent:

6053673, Apr 25, 2000

Filed:

Mar 8, 1999

Appl. No.:

9/265526

Inventors:

Steven M. Swift - Sumner WA
Larry R. Swift - Seattle WA
Moses H. Sahagian - Sumner WA

International Classification:

B23C 512

US Classification:

407 42

Abstract:

An improved corner-rounding milling cutter preformed indexable and insert therefor. A plurality of the inserts staggered around the axis of rotation of the cutter body cut segments of a composite arcuate cutting profile of uniform radius, together forming the complete arcuate cutting profile. The inserts are interchangeable between any of the positions provided on the milling cutter.