GSM
During remote operation of the bit error measurement you should configure the trigger arm to single, see
SETup:BERRor:CONTinuous
.
If the trigger arm is not set to single, the measurement may not return a result. When trigger arm is continuous the measurement rearms itself and starts another measurement cycle, during remote operation the fetch query may not be synchronized to the measurement cycle, see
Measurement States
.
If you have a BER measurement active and your mobile drops the call it may be that you have the
SETup:BERRor:SLControl[:STATe]
command set to OFF. This is likely to occur with mobiles that do not respond to downlink signalling when loopback is closed. To solve this problem set the command to ON.
GPRS
The error correction which is a feature of channel coding scheme CS-1 will mask low to medium bit error rates if used during BER measurements. This will result in measurement results which are not ideal. Therefore, CS-4 is the recommended coding scheme for BER measurements. You use the command
CALL:PDTCH:CSCHeme
to set the channel coding scheme.
During remote operation of the bit error measurement you should configure the trigger arm to single, see
SETup:GBERror:CONTinuous
.
The BER measurement only provides results when the test set's operating mode is:
-
GPRS BCH+PDTCH test mode, or
-
Active Cell, and the Data Connection Type is set to ETSI Type B. For details on setting the Data Connection Type see
CALL:FUNCtion:DATA:TYPE
. For details on setting the cell operating mode, see
CALL:OPERating:MODE
.
BER measurements cannot be run concurrently with BLER measurements. Starting a BER measurement while a BLER measurement is currently running, closes the BLER measurement.
