JPS5548684A - Watch - Google Patents

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Publication number
JPS5548684A
JPS5548684A JP12170678A JP12170678A JPS5548684A JP S5548684 A JPS5548684 A JP S5548684A JP 12170678 A JP12170678 A JP 12170678A JP 12170678 A JP12170678 A JP 12170678A JP S5548684 A JPS5548684 A JP S5548684A
Authority
JP
Japan
Prior art keywords
commercial power
power source
counter
circuit
terminal
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.)
Pending
Application number
JP12170678A
Other languages
Japanese (ja)
Inventor
Takuji Suzuki
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.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen Co Ltd
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 Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP12170678A priority Critical patent/JPS5548684A/en
Publication of JPS5548684A publication Critical patent/JPS5548684A/en
Pending legal-status Critical Current

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  • Electric Clocks (AREA)

Abstract

PURPOSE: To secure an automatic detection for the commercial power source at each area and then to realize the application of the power source as the reference clock by giving the comparative measurement to the commercial power frequencies with installation of the clock oscillation circuit featuring the fixed assuredness.
CONSTITUTION: With connection of the commercial power source of 50Hz to terminal 2, comparator 3 gives a comparison between the commercial power frequency and the oscillation frequency of comparing clock oscillation circuit 1 and then switches switch circuit 6 to the side of 1/50 counter 4 by the comparison output. As a result, watch counter circuit 7 counts the second pulses given from counter 4. While with connection of the commercial power source of 60Hz to terminal 2, 1/ 60 counter 5 is connected to circuit 7 in the same way. In such way, the commercial power source of the corresponding area can be automatically used as the reference clock.
COPYRIGHT: (C)1980,JPO&Japio
JP12170678A 1978-10-03 1978-10-03 Watch Pending JPS5548684A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12170678A JPS5548684A (en) 1978-10-03 1978-10-03 Watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12170678A JPS5548684A (en) 1978-10-03 1978-10-03 Watch

Publications (1)

Publication Number Publication Date
JPS5548684A true JPS5548684A (en) 1980-04-07

Family

ID=14817859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12170678A Pending JPS5548684A (en) 1978-10-03 1978-10-03 Watch

Country Status (1)

Country Link
JP (1) JPS5548684A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258313A (en) * 2005-03-15 2006-09-28 Fuji Electric Holdings Co Ltd Pulse tube refrigerating machine and device mounted therewith

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258313A (en) * 2005-03-15 2006-09-28 Fuji Electric Holdings Co Ltd Pulse tube refrigerating machine and device mounted therewith

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