Digital Seismic Clock

Brief Description

Digital Seismic Clock, developed and fabricated at CSIO Chandigarh is a sophisticated, rugged and extremely accurate low power system for use in seismic workstation. Provision is made for the operator to alter time mark sequences. Controls are available on the timing system Front Panel. Programmable function switch is provided to control the six digit seven segment LED display to set the time of the clock.

It is completely self-contained, battery-cum-mains powered unit capable of operating unattended for very long period without any maintenance. Its clock can be synchronized with ATA signal received by the radio receiver. The Time Marker output signal is available at the back panel for impinging it on a drum recorder. A relay output at the back panel is provided which may be used to have audio or visual Time Marker outputs. Program selector switch which enable the operator to preset time, correct for Time Drift @ 8 ms sec and to alter the time marker program available for the recorder. Provision for external battery is made in case of non-availability of mains power at Seismic Station. Its internal 2.4 AH dry battery is continuously charged by the mains supply

Salient Features

• Seismic clock can be synchronized with the ATA signal.
• Time marker output available at back panel for impinging it on a drum record.
• Relay output available at back panel. It can be used to have audio or visual time marker output.
• Internal battery operated, Temperature compensated crystal has been used in timing oscillator.
• Very low drift less than 225 ms/day.
• 6-digit display on the front panel for - Hour, Minutes and Seconds.

Applications

• Reference timing unit in seismic workstation.

Benefits

The developed clock, which gives precision time, is being used as reference clock in many observatories.

For further information please contact

Central Scientific Instruments Organisation,
Chandigarh
Website: http://www.csio.res.in/