GB1504130A - Readout means - Google Patents
Readout meansInfo
- Publication number
- GB1504130A GB1504130A GB3418174A GB3418174A GB1504130A GB 1504130 A GB1504130 A GB 1504130A GB 3418174 A GB3418174 A GB 3418174A GB 3418174 A GB3418174 A GB 3418174A GB 1504130 A GB1504130 A GB 1504130A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- current
- meter
- amplifier
- supply
- Prior art date
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
-
- 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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
1504130 Measuring voltage STRAINSTALL Ltd 16 July 1975 [2 Aug 1974] 34181/74 Heading G1U In providing readings from a plurality of transducers, the output voltage from each is applied to a respective constant current source including a voltage regulator, voltage amplifier and an output current stage whose output current magnitude is proportional to the transducer voltage and which is cut-off instantaneously if the supply voltage thereto is of a particular polarity. The current sources are connected to read-out means, comprising a diode and current meter for each transducer, via at least three inter-connecting conductors, two of which are connected to an alternating voltage supply and the others, which carry the output current from the current sources, are equal in number to onehalf the number of current sources (rounded up to the nearest whole number if the number of current sources is odd. The supply V S is connected to terminals A, B in an amplifier unit over leads of resistance r 1 , r 2 . A voltage regulator VR applies a constant voltage VR to the strain gauge (or temperature or position sensor) bridge T, independent of fluctuations in V S and the values of r 1 , r 2 . The bridge output voltage is converted to a current I o whose value depends solely on the values of v o , Rl, R2 and R3. The current I o flows through a meter M indicating the parameter measured by the bridge T. In the invention, pairs of bridges and amplifier units are connected to the same three leads r 1 , r 2 , r 3 , except the terminals A, B are reversed for the respective units, Fig. 2 (not shown). Thus, while the squarewave supply V 1 makes one terminal (X) positive with respect to the other (Y), one amplifier unit (A 1 ) is energized to provide an indication on a first meter (M1). During the other half-cycle this amplifier (A1) is de-energized since diode D, Fig. 1, is reverse biased. Thus the other meter (M2) indicates the measurement of the second transducer (T 2 ). Further pairs require only the addition of one further conductor i.e. equivalent to r3. Any unpaired amplifier unit also requires one extra conductor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3418174A GB1504130A (en) | 1975-07-16 | 1975-07-16 | Readout means |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3418174A GB1504130A (en) | 1975-07-16 | 1975-07-16 | Readout means |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1504130A true GB1504130A (en) | 1978-03-15 |
Family
ID=10362401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3418174A Expired GB1504130A (en) | 1975-07-16 | 1975-07-16 | Readout means |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1504130A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2487515A1 (en) * | 1980-07-25 | 1982-01-29 | Sereg Soc | DEVICE FOR MEASURING, IN PARTICULAR A PRESSURE, WITH A DETECTOR REMOTELY PLACING ITS ELECTRICAL POWER SUPPLY |
EP0058181A1 (en) * | 1980-08-20 | 1982-08-25 | Rosemount Inc | Low power transmitter. |
US4532510A (en) * | 1982-06-24 | 1985-07-30 | Sereg, S.A. | Measuring apparatus having a sensor located remotely from its electricity power supply |
WO1998028725A2 (en) * | 1996-12-20 | 1998-07-02 | Pepperl + Fuchs Gmbh | Sensor and evaluation system, in particular for double sensors for determining end positions and limit values |
-
1975
- 1975-07-16 GB GB3418174A patent/GB1504130A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2487515A1 (en) * | 1980-07-25 | 1982-01-29 | Sereg Soc | DEVICE FOR MEASURING, IN PARTICULAR A PRESSURE, WITH A DETECTOR REMOTELY PLACING ITS ELECTRICAL POWER SUPPLY |
EP0045245A1 (en) * | 1980-07-25 | 1982-02-03 | Sereg S.A. | Measuring apparatus, especially for pressure, using a detector placed at a distance from its electrical power source |
EP0058181A1 (en) * | 1980-08-20 | 1982-08-25 | Rosemount Inc | Low power transmitter. |
EP0058181A4 (en) * | 1980-08-20 | 1983-02-09 | Rosemount Inc | Low power transmitter. |
US4532510A (en) * | 1982-06-24 | 1985-07-30 | Sereg, S.A. | Measuring apparatus having a sensor located remotely from its electricity power supply |
WO1998028725A2 (en) * | 1996-12-20 | 1998-07-02 | Pepperl + Fuchs Gmbh | Sensor and evaluation system, in particular for double sensors for determining end positions and limit values |
WO1998028725A3 (en) * | 1996-12-20 | 1998-09-03 | Pepperl & Fuchs | Sensor and evaluation system, in particular for double sensors for determining end positions and limit values |
US6429786B1 (en) | 1996-12-20 | 2002-08-06 | Pepperl + Fuchs Gmbh | Sensor and evaluation system, in particular for double sensors for determining positions and limit values |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |