Meinberg TCR51USB - Manual (Page 11)

11
Buffering
If the power supply fails, an onboard realtime clock automatic switching to crystal time
base. In this case the power requirement of this clock has been taken over by an
internal capacitor which was load by the USB Powersupply.
This enables a independent Voltagesupply for the internal realtime clock of ca. 5 Days.
After this this time the TCR51USB is not able to read, during the start activity, the
correct time and date information from the realtime clock. Therefor the TCR51USB is
not able to synchronize to the received IRIG signal.
In this case it is necessary at first to set the correct date information to the
TCR51USB. After the synchronization with the IRIG signal the correct Date and
Time information were written to the realtime clock
Putting into operation
To achieve correct operation of the board, the following points must be observed.
Installing the TCR51USB
After installing the software to the PC the TCR51USB was detected automaticly.
Power supply
The power supplies needed by TCR51USB was delivered by the USB.
Input signals
Amplitude modulated and Pulse width modulated signals IRIG-A/B (or AFNOR) codes
must be connected to the SMB-jack connector in the housing of TCR51USB. A shielded
or a twisted pair cable should be used.
The IRIG code used must be configured with the monitor software.
The board TCR51USB can’t be used to decode amplitude modulated and DC
Level Shift signals simultaneously. Depending on the selected code, only the signal
at the SMB-connector is decoded.