GB1276358A - Improvements in or relating to test equipment - Google Patents

Improvements in or relating to test equipment

Info

Publication number
GB1276358A
GB1276358A GB3873269A GB3873269A GB1276358A GB 1276358 A GB1276358 A GB 1276358A GB 3873269 A GB3873269 A GB 3873269A GB 3873269 A GB3873269 A GB 3873269A GB 1276358 A GB1276358 A GB 1276358A
Authority
GB
United Kingdom
Prior art keywords
frequency
counter
count
testing
circuit
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
GB3873269A
Inventor
Roy David Payne
Janos Joszef Jako
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3873269A priority Critical patent/GB1276358A/en
Priority to NL7011043A priority patent/NL7011043A/xx
Priority to FR7028381A priority patent/FR2057890A5/fr
Priority to DE19702038033 priority patent/DE2038033A1/en
Publication of GB1276358A publication Critical patent/GB1276358A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Tests Of Electronic Circuits (AREA)

Abstract

1276358 Frequency testing STANDARD TELEPHONES & CABLES Ltd 29 July 1970 [1 Aug 1969] 38732/68 Heading G4H Apparatus for testing the frequency of, for example, oscillators includes a counter 7 preset to a number determined by the nominal value of the frequency being tested and an amplifier 1, squarer 2 and divide circuits 3, 4 via which the input signal is applied to enable gate G5 to pass clock pulses for one or more half-cycles of the square wave signal from circuit 4 to the counter 7, the difference between the measured count and the value which it should attain being indicated to give the deviation of the frequency. As described for testing frequencies of 1850 c/s., 1650 c/s., 1180 c/s. and 980 c/s. (for the first two of which circuit 4 divides by two), for each frequency an associated gate G1-G4 is enabled so that a matrix 8 presets counter 7 to the desired count. At the end of the measurement the count is read out to a decoder and shift register 13 controlling lamps 14 to display the magnitude and sense of the error.
GB3873269A 1969-08-01 1969-08-01 Improvements in or relating to test equipment Expired GB1276358A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB3873269A GB1276358A (en) 1969-08-01 1969-08-01 Improvements in or relating to test equipment
NL7011043A NL7011043A (en) 1969-08-01 1970-07-24
FR7028381A FR2057890A5 (en) 1969-08-01 1970-07-31
DE19702038033 DE2038033A1 (en) 1969-08-01 1970-07-31 Frequency testing procedure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3873269A GB1276358A (en) 1969-08-01 1969-08-01 Improvements in or relating to test equipment

Publications (1)

Publication Number Publication Date
GB1276358A true GB1276358A (en) 1972-06-01

Family

ID=10405353

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3873269A Expired GB1276358A (en) 1969-08-01 1969-08-01 Improvements in or relating to test equipment

Country Status (4)

Country Link
DE (1) DE2038033A1 (en)
FR (1) FR2057890A5 (en)
GB (1) GB1276358A (en)
NL (1) NL7011043A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113008837A (en) * 2021-02-18 2021-06-22 交通运输部天津水运工程科学研究所 High-precision turbidity sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113008837A (en) * 2021-02-18 2021-06-22 交通运输部天津水运工程科学研究所 High-precision turbidity sensor
CN113008837B (en) * 2021-02-18 2022-08-23 交通运输部天津水运工程科学研究所 High-precision turbidity sensor

Also Published As

Publication number Publication date
NL7011043A (en) 1971-02-03
FR2057890A5 (en) 1971-05-21
DE2038033A1 (en) 1971-02-11

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees