Geotech Instruments, LLC

Global Timing System

Model GTS-ONE

line

  • Precision Trimble™ GPS receiver
  • Large LCD display for UTC or local time
  • Rack-mount and desktop versions
  • Front panel or external RS-232 control

The Model GTS-ONE is a GPS synchronized timing system designed to provide the outputs required by scientists for earthquake studies. It is available in either rack-mount version or as optional desktop version. The time source was a GPS-1, now is a GPS-2, receiver.

Features include a large front-panel LCD that displays all GPS outputs and status, a programmable alarm and timing pulse, and four RS-232 ports for interface to a PC.

Standard outputs include a 1 kHz clock signal, short-period and long-period time marks, a 50/60 Hz synchronization for power, and IRIG E code for IASPEI and other similar systems. An optional BCD output is also available.

line

TECHNICAL SPECIFICATIONS

ACCURACY

1 PPS


Position
Drift unlocked
To input trigger

 - ±2 microseconds, typical, referenced to UTC; a dwell time of 2-3 minutes after satellite lock-on is needed before the 1 pps is within the specifications
- 25 meters spherical error probability (SEP), 100 meters
- 3 microseconds/minute
- External pulse to within ±3 microseconds

OUTPUTS

Time marks
Time codes
Clock Synchronization
Power Synchronization
Reference Pulse

1 PPS

RS-232 interface
Optional output

 - 5, 30 and 60 minute, 1 and 10 second, 0 to +5V
- IRIG E, 0 to +5 volts dc-level shift
- 1 kHz, 0 to +5 volts
- 50/60 Hz, 0 to 11 V push-pull square wave
- 0 to +5 V pulse programmable for future event to within ±1 ms.
- 10 ms, +5 volts (negative going) pulse on the UTC second
- 4 independent 4800 baud RS-232 ports
- BCD

DISPLAY

Type

Controls

Character size

 - Liquid Crystal Display (LCD), 16 character x 1 line, dot matrix with back lighting
- Push-button, selects display for any one of 31 time zones, position, GPS status, and a menu of options
- 1.2 cm high x 0.6 cm wide (0.47 in. x 0.24 in.)

POWER REQUIREMENTS

Operating voltage
Current

Character size

 - 10 to 14 V dc or 100 to 240 V ac, 47-63 Hz
- less than 350 mA at 12 V (backlight off)
- less than 750 mA at 12 V (backlight on)
- 1.2 cm high x 0.6 cm wide (0.47 in. x 0.24 in.)

ENVIRONMENTAL CHARACTERISTICS

Operating temperature
Storage temperature
Humidity

 - -40 șC to ±71 șC (receiver), 0 șC to ±50 șC (display)
- -55 șC to ±85 șC (receiver), -20 șC to ±60 șC (display)
- 0 to 100% condensing (receiver), 10 to 80% (display)

PHYSICAL CHARACTERISTICS (GPS-1 not included)

Rack-Mount Version



Desk-Top Version

 - Height 8.89 cm (3.5 in.)
- Width 48.2 cm (19 in.)
- Length 31.4 cm (12.4 in.)
- Weight 5.45 kg. (12 lbs.)
- Height 8.89 cm (3.5 in.)
- Width 44.5 cm (17.5 in.)
- Length 31.4 cm (12.4 in.)
- Weight 5.45 kg. (12 lbs.)
 

line