APPENDIX C
1.1 SPECIFICATIONS
DC Input Voltage Range: DC = 38-73 VDC
DC Input Current (Max.) @ 38V: .6 amps
DC Input Current (Max.) @ 73V: .3 amps
Note: The input current is dependent on the number of options installed in the GPS
TC&FG.
Fault Relay: Closure on fault.
Timing Relay: Closure when not locked.
Relay Contact Ratings: 10 watts, 0.5 amps, 200 volts.
50/60Hz Measurement Input: 85-250 VAC.
1.2 OPERATION
This option has two relay closures to indicate timing/fault of the unit. The fault relay output on
the rear panel terminal strip TB1-4 and 5 will provide contact closure upon the following
conditions:
A processor error, Channel One error, or Channel Two error from the GPS receiver
(SVee Six Module).
Loss of +5VDC.
If the DAC value goes below 300 or above 65,000.
The timing relay (output on the rear panel terminal strip TB1-6 and 7) provides a contact closure
until the unit has achieved oscillator lock. For example, until the front panel LOCKED LED
illuminates.
Operation of the optional 50/60Hz measurement feature is as follows:
With the unit operating, connect the AC measurement source to TB1-8 and TB1-9 (50/60Hz
Measurement Input). Make sure that when plugging in the cable to the AC power source that it
is correctly polarized. For example, the pin labeled AC HI (50/60Hz Measurement Input - HI) is
plugged into the AC HOT receptacle. If this connection is reversed, the phase angle
measurement will be off by 180
o
.
The frequency measurement is made by counting the number of 50/60Hz sine waves occurring
between successive corrected 1pps pulses from the GPS receiver.
The phase angle measurement is made by calculating where the 1pps pulse occurs in relationship
to the 50/60Hz sine wave.
C-24 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
To Next Page
Loading...
Need help?
General
