Meinberg HSC509 - Manual (Page 11)

11
Installation
Power Supply
The system requires an operating voltage of 230V/50Hz witch is applied via the power
supply cord at the bottom of the housing.
Mounting the Antenna
Generally it is important to position the antenna in an optimal way. The antenna
should be aligned at a right angle to the direction of the transmitter (Frankfurt). It
should be mounted at least 30 centimeters away from the clock unit and from solid
steel. A distance of several meters is recommended to all TVs or computer monitors.
The scope of supply includes an active ferrite antenna for indoor mounting (AI01)
and 5m of RG174 coaxial cable. When mounting the antenna outdoor the weather
proof Antenna AW02 is to use.
Powering Up the System
After connecting the power supply and the antenna the system is ready to operate.
Time, date and the relay conditions are displayed on the LC display (the timebase
choosen for COM0 is displayed).
The brighness of the “Feld” LED in the front panel depends on the signal strength of
the DCF77 carrier. In order to get the maximum signal, the antenna should be aligned
in two steps. First it should be turned slowly until the “Feld” LED is mostly dimmed.
Finally the antenna must be turned by 90° from this position to obtain maximum
signal. If the antenna is installed properly and the signal from DCF77 can be received
without strong distortions, the "Mod." LED starts blinking exactly once per second,
corresponding to the time marks from DCF77. If this LED flashes intermediately,
there is some electrical noise around which prevents the microprocessor from deco-
ding the time message. So a better location for the antenna must be found. In case of
correct reception it takes up to three minutes after power-up until the clock is
synchronized and the "Freil." LED is turned off. It is turned on again to indicate the
loss of or an error in reception. Without RF signal the clock runs on XTAL with an
accuracy of 10
-6 . The "Freil." LED indicates three different alarm conditions by
blinking:
1. If the clock has lost reception for more than 12 hours the "Freil." LED starts blinking.
2. Short-circuit on the second-line; alarm message is displayed
3. Short-circuit on the minute-line; alarm message is displayed
The serial outputs are enabled immediately after power up. Baudrate, framing,
output mode and time zone can be configured separately by two DIL switches.