CA2299044A1 - Method and apparatus for automatically controlled gain switching of monitors - Google Patents

Method and apparatus for automatically controlled gain switching of monitors Download PDF

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Publication number
CA2299044A1
CA2299044A1 CA002299044A CA2299044A CA2299044A1 CA 2299044 A1 CA2299044 A1 CA 2299044A1 CA 002299044 A CA002299044 A CA 002299044A CA 2299044 A CA2299044 A CA 2299044A CA 2299044 A1 CA2299044 A1 CA 2299044A1
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Canada
Prior art keywords
gain
samples
saturated
channel
buffer
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002299044A
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French (fr)
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CA2299044C (en
Inventor
Piotr B. Przydatek
Rene T. Jonker
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Power Measurement Ltd
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Power Measurement Ltd
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Publication date
Application filed by Power Measurement Ltd filed Critical Power Measurement Ltd
Publication of CA2299044A1 publication Critical patent/CA2299044A1/en
Application granted granted Critical
Publication of CA2299044C publication Critical patent/CA2299044C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique

Abstract

A method and apparatus for automatically controlling gain switching of a monitor. To automatically control gain switching, an electronic circuit splits an input channel into a plurality of gain channels. The plurality of gain channels are simultaneously sampled. Thereafter, the processor accesses a present buffer of a first gain channel. The present buffer contains a predetermined amount of samples which represent the input channel. Next, the processor determines whether at least one of the samples contained in the present buffer is saturated. If at least one of the samples is saturated, the processor selects an alternate gain channel. Otherwise, if none of the samples is saturated, the processor determines whether a previous buffer of the first gain channel is saturated. If none of the samples from the previous buffer are saturated, the DSP selects the first gain channel. Otherwise, the DSP selects the alternate gain channel. Thereafter, the samples are processed from more than one of the plurality of gain channels to calculate power parameters.
CA002299044A 1999-08-09 2000-02-21 Method and apparatus for automatically controlled gain switching of monitors Expired - Lifetime CA2299044C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/369,870 1999-08-09
US09/369,870 US6397155B1 (en) 1999-08-09 1999-08-09 Method and apparatus for automatically controlled gain switching of monitors

Publications (2)

Publication Number Publication Date
CA2299044A1 true CA2299044A1 (en) 2001-02-09
CA2299044C CA2299044C (en) 2003-11-04

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Family Applications (1)

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CA002299044A Expired - Lifetime CA2299044C (en) 1999-08-09 2000-02-21 Method and apparatus for automatically controlled gain switching of monitors

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US (1) US6397155B1 (en)
CA (1) CA2299044C (en)

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US6397155B1 (en) * 1999-08-09 2002-05-28 Power Measurement Ltd. Method and apparatus for automatically controlled gain switching of monitors
US9897461B2 (en) 2015-02-27 2018-02-20 Electro Industries/Gauge Tech Intelligent electronic device with expandable functionality
US10048088B2 (en) 2015-02-27 2018-08-14 Electro Industries/Gauge Tech Wireless intelligent electronic device
US11009922B2 (en) 2015-02-27 2021-05-18 Electro Industries/Gaugetech Wireless intelligent electronic device

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6397155B1 (en) * 1999-08-09 2002-05-28 Power Measurement Ltd. Method and apparatus for automatically controlled gain switching of monitors
US9897461B2 (en) 2015-02-27 2018-02-20 Electro Industries/Gauge Tech Intelligent electronic device with expandable functionality
US10048088B2 (en) 2015-02-27 2018-08-14 Electro Industries/Gauge Tech Wireless intelligent electronic device
US10274340B2 (en) 2015-02-27 2019-04-30 Electro Industries/Gauge Tech Intelligent electronic device with expandable functionality
US10739162B2 (en) 2015-02-27 2020-08-11 Electro Industries/Gauge Tech Intelligent electronic device with surge supression
US11009922B2 (en) 2015-02-27 2021-05-18 Electro Industries/Gaugetech Wireless intelligent electronic device
US11641052B2 (en) 2015-02-27 2023-05-02 El Electronics Llc Wireless intelligent electronic device
US11644341B2 (en) 2015-02-27 2023-05-09 El Electronics Llc Intelligent electronic device with hot swappable battery

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Publication number Publication date
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US6397155B1 (en) 2002-05-28

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Effective date: 20200221