GB1148419A - Circuit arrangements for converting unidirectional measurement signals into digital signals - Google Patents

Circuit arrangements for converting unidirectional measurement signals into digital signals

Info

Publication number
GB1148419A
GB1148419A GB4017967A GB4017967A GB1148419A GB 1148419 A GB1148419 A GB 1148419A GB 4017967 A GB4017967 A GB 4017967A GB 4017967 A GB4017967 A GB 4017967A GB 1148419 A GB1148419 A GB 1148419A
Authority
GB
United Kingdom
Prior art keywords
frequency
sfu
superimposed
converter
low impedance
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
Application number
GB4017967A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1148419A publication Critical patent/GB1148419A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/026—Arrangements for signalling failure or disconnection of thermocouples

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Analogue/Digital Conversion (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

1,148,419. Selective signalling. SIEMENS A.G. 1 Sept., 1967 [8 Sept., 1966], No. 40179/67. Heading G4H. In a voltage digitizer of the type in which an input voltage, from a low impedance source, e.g. from a thermo-couple G 1 , is converted SFU into a corresponding frequency which is then counted Z for a reference period ZG, a high impedance A.C. source U, having a frequency which is a sub-multiple of the reference period ZG, is superimposed upon the input voltage, the arrangement being such that when the low impedance source G 1 is correctly connected the superimposed A.C. is heavily attenuated and only a little reaches the converter SFU (and what does reach the converter has no effect upon the count) but if a fault develops in a low impedance source, or in the connections to it, then the full unattenuated superimposed A.C. reaches the converter SFU causing it to produce, at the positive peaks of the A.C., a frequency which exceeds that which would normally be produced if no fault had developed, which frequency is detected ZK, GU, to actuate a fault indicating device.
GB4017967A 1966-09-08 1967-09-01 Circuit arrangements for converting unidirectional measurement signals into digital signals Expired GB1148419A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1966S0105763 DE1283378B (en) 1966-09-08 1966-09-08 Circuit arrangement for converting measurement DC voltages into a pulse frequency

Publications (1)

Publication Number Publication Date
GB1148419A true GB1148419A (en) 1969-04-10

Family

ID=7526849

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4017967A Expired GB1148419A (en) 1966-09-08 1967-09-01 Circuit arrangements for converting unidirectional measurement signals into digital signals

Country Status (3)

Country Link
DE (1) DE1283378B (en)
GB (1) GB1148419A (en)
NL (1) NL6710808A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2498370A (en) * 2012-01-12 2013-07-17 Rolls Royce Engine Control Systems Ltd Thermocouple fault detection

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717815A (en) * 1980-07-05 1982-01-29 Horiba Ltd Display device of measuring device
US5418464A (en) * 1993-07-26 1995-05-23 John Fluke Mfg. Co., Inc. Thermocouple open circuit detection with tone frequency signal application and spectral analysis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2498370A (en) * 2012-01-12 2013-07-17 Rolls Royce Engine Control Systems Ltd Thermocouple fault detection

Also Published As

Publication number Publication date
NL6710808A (en) 1968-03-11
DE1283378B (en) 1968-11-21

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