Ametek TR-2100 Operation Manual page 31

TR-2100 User Manual 25
GPS Antenna
The TR-2100 uses an internal GPS receiver as a very accurate source of time. This allows
triggered transient and disturbance records to be given an accurate time tag. It also allows
the absolute phase of the voltage and current signals to be measured. If two or more TR-
2100s are located on a grid, accurate differential phase measurements can be made.
One of the most important factors affecting the continuous accuracy of the time and hence,
phase in the TR-2100 is the adjustment of the antenna. This is a marine pole-mounted type
and is designed for use outside in all weather.
The antenna should be located vertically at a place where it has the maximum view of the
sky with no obstructions. If visibility is poor, it may take an extended period before the time
output is locked to Universal co-ordinated time (UTC). Even then, accuracy will be lost if
there are no satellites in view for more than 5 minutes. A good view of the sky is the
requirement for long-term reliability.
To overcome losses in the co-axial cable and their connectors, there is an amplifier in the
antenna module. Power for this is supplied up the same co-ax cable. The standard cable
length supplied with the TR-2100 is 20 meters. If a longer cable is required, lower loss cable
may need to be used with a higher gain antenna.
GPS
ANTENNA
MASTER
REMOTE #1 REMOTE #2 REMOTE #3
GPS 1 PPS 1 PPS 1 PPS 1 PPS
F.O. F.O. F.O.
AERIAL
IN
IN IN
IN
Cable Cable Cable
OUT OUT OUT
OUT
Coax Cable
TIME CODE TIME CODE
TIME CODE TIME CODE
(OUT) (IN)
(IN) (IN)
5 9 1 6 1 6 1 6
120 120
(+) (-) (+) (-) (+) (-) (+) (-)
ohm ohm
Figure 6 Time-Synchronization Connections for Multiple TR-2000 Chassis