User Manual DDS200 Digital Demodulation System 070-9952-00

Manual OperationPrinting of alarm messages with LINE... is performed in a similar way. Contraryto the printout selected with LAST LINES..., any group of lines in the alarmregister can be printed. The DDS200 asks for the start- and end-line numbers,which can be entered separately. Entries are made in the same way as describedfor the printout selected with LAST LINES... . When the PRINT key is pressed,the alarm messages associated with the selected line numbers are printed. If thestart-line number is higher than the stop-line number, an error message is output.An exception is if there are exactly 1000 entries in the alarm register, printing canbe continued beyond line 000.Example:START LINE = 995STOP LINE = 005PRINT: ⇒11 lines from 995 to 005 are printedA started printing procedure can be aborted with the ABORT key.Clearing the Register. The alarm register of the DDS200 is automatically clearedwhen one of the following conditions occurs:The supply voltage is switched on.The RF is changed.Another input or input filter (SAW filter) is selected.A new QAM order or symbol rate is selected.The equalizer setting or the loop bandwidth is changed.MPEG data outputs are newly configured.The constellation diagram or the parameter calculation is activated.The external BER measurement is disabled.The PRESET key is pressed.The register can also be manually cleared. This is done by pressing first theALARM function key and then the REG. CLR... (Register Clear) soft key. Theinstruments queries whether the register should really be cleared. When YES ispressed, the register is cleared completely and date and time of the clearing areentered in line 0 of the register. The register is now ready for entering new alarmmessages.DDS200 Digital Demodulation System User Manual 2–45