FR2256409A1 - - Google Patents
Info
- Publication number
- FR2256409A1 FR2256409A1 FR7443460A FR7443460A FR2256409A1 FR 2256409 A1 FR2256409 A1 FR 2256409A1 FR 7443460 A FR7443460 A FR 7443460A FR 7443460 A FR7443460 A FR 7443460A FR 2256409 A1 FR2256409 A1 FR 2256409A1
- Authority
- FR
- France
- 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
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/10—AC or DC measuring bridges
- G01R17/16—AC or DC measuring bridges with discharge tubes or semiconductor devices in one or more arms of the bridge, e.g. voltmeter using a difference amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Biochemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Remote Sensing (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Power Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB15674 | 1974-01-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2256409A1 true FR2256409A1 (fr) | 1975-07-25 |
FR2256409B3 FR2256409B3 (fr) | 1977-09-23 |
Family
ID=9699390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7443460A Expired FR2256409B3 (fr) | 1974-01-02 | 1974-12-31 |
Country Status (5)
Country | Link |
---|---|
US (1) | US3979667A (fr) |
JP (1) | JPS50102397A (fr) |
DE (1) | DE2461393A1 (fr) |
FR (1) | FR2256409B3 (fr) |
NL (1) | NL7500033A (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0013706A1 (fr) * | 1978-12-22 | 1980-08-06 | Siemens Aktiengesellschaft | Dispositif pour la surveillance automatique de l'état de charge de la source d'alimentation indépendante du secteur et de l'humidité dans le répondeur d'un système de localisation de véhicules |
WO1991018286A1 (fr) * | 1990-05-11 | 1991-11-28 | Luis Lopez Rayado | Indicateur d'arrosage domestique |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5227287U (fr) * | 1975-08-18 | 1977-02-25 | ||
US4070615A (en) * | 1976-05-12 | 1978-01-24 | Tektronix, Inc. | Compensation indicator for attenuation probe |
JPS5380486U (fr) * | 1976-12-06 | 1978-07-04 | ||
US4122389A (en) * | 1977-05-23 | 1978-10-24 | Tandy Corporation | Moisture sensor |
US4268824A (en) * | 1977-12-09 | 1981-05-19 | Phillips Reed E | Plant soil moisture level-signaling device for household and commercial use |
AU5728380A (en) * | 1979-04-10 | 1980-10-16 | Johnston, Hal Pty. Ltd. | Hood for rotary-arm dishwasher |
DE3110671A1 (de) * | 1981-03-19 | 1983-03-24 | Johnson Service Co., Milwaukee, Wis. | Analoge ausgangssignalnzeige |
FR2517061A1 (fr) * | 1981-11-20 | 1983-05-27 | Mere Malleray Et Cie | Indicateur electronique d'arrosage |
US5450012A (en) * | 1993-09-15 | 1995-09-12 | Hydro-Quebec | Soil electrode assembly for protecting and supporting an electrode member for measuring the resistivity of a volume of the soil |
US6700395B1 (en) | 2002-04-26 | 2004-03-02 | Betty J. Perry | Soil moisture indicator device |
DE102005058436A1 (de) * | 2005-12-07 | 2007-06-14 | Werner Krachtus | Vorrichtung zur Messung und Anzeige der Feuchtigkeit in einem Erdreich |
CN102426178A (zh) * | 2011-10-08 | 2012-04-25 | 黄宇嵩 | 育秧棚用电桥式湿度指示器 |
US11243182B2 (en) * | 2019-02-05 | 2022-02-08 | AGI Suretrack LLC | Moisture soil probe system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3452347A (en) * | 1966-11-03 | 1969-06-24 | Eastman Kodak Co | Luminous diode battery condition indicator for camera |
US3688309A (en) * | 1970-09-09 | 1972-08-29 | Herman W Volberg | Device for detecting and displaying the response of a tissue to stimuli |
US3882383A (en) * | 1973-06-07 | 1975-05-06 | Charles Matlin | Soil moisture sensing system |
-
1974
- 1974-12-13 US US05/532,672 patent/US3979667A/en not_active Expired - Lifetime
- 1974-12-24 DE DE19742461393 patent/DE2461393A1/de active Pending
- 1974-12-27 JP JP50001117A patent/JPS50102397A/ja active Pending
- 1974-12-31 FR FR7443460A patent/FR2256409B3/fr not_active Expired
-
1975
- 1975-01-02 NL NL7500033A patent/NL7500033A/xx unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0013706A1 (fr) * | 1978-12-22 | 1980-08-06 | Siemens Aktiengesellschaft | Dispositif pour la surveillance automatique de l'état de charge de la source d'alimentation indépendante du secteur et de l'humidité dans le répondeur d'un système de localisation de véhicules |
WO1991018286A1 (fr) * | 1990-05-11 | 1991-11-28 | Luis Lopez Rayado | Indicateur d'arrosage domestique |
Also Published As
Publication number | Publication date |
---|---|
US3979667A (en) | 1976-09-07 |
JPS50102397A (fr) | 1975-08-13 |
DE2461393A1 (de) | 1975-11-06 |
FR2256409B3 (fr) | 1977-09-23 |
NL7500033A (nl) | 1975-07-04 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |