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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.
- Program selector switch enables the user to preset the
time, to correct the time drift at the rate of 8 ms/sec
and
to alter the time marker.
- 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.
Contact:
Central Scientific Instruments Organisation,
Chandigarh
Website: http://www.csio.res.in/
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