Filter
Top Products
2-45
Making Measurements
Advanced Features
9 The RF Generator may become uncalibrated in a hopping situation when the last
CW frequency setting was outside the GSM or DCS band. If you are using the RF
Generator outside the normal GSM or DCS bands, make sure you set a valid
GSM or DCS frequency in the CW frequency before entering a hopping mode.
This includes the ACTIVE CELL (ACTIVATED state on the CELL CONFIG 2
screen) on the Agilent 8922M/S.
10 When using RF Rise triggering it is recommended to set MS_Parms:Timing
Advance to MANUAL with the Timing Advance set to zero. If AUTO timing
advance is used with RF Rise triggering, the Agilent 8922M/S, operating as a
base station, will progressively command the mobile to advance timing until it is
at the maximum value of 64. It is difficult to recover from this state without
ending the call with the mobile. Changing back to EXT_DEMOD triggering will
cause the call to drop. This is because the Agilent 8922M/S is listening for the
mobile 64 bits later than the RF Rise triggering left it.
11 When making measurements over the GPIB, it is often necessary to place time-
out constraints in software to account for mobile failure. When a time-out is
encountered while a measurement is armed but not complete, it is necessary to
perform a “CLEAR” operation on the GPIB. A “RESET” operation is
insufficient.
Example
ASSIGN @gpib TO 714
OUTPUT @gpib;”TRIGger:ASTate ’ARM’”
ON TIMEOUT 7,5 GOTO Flag1
OUTPUT @gpib;”MEASure:DSP:PHASe:FREQuency?”
ENTER @gpib;The_answer
PRINT ‘FREQUENCY:’; The_answer
OFF TIMEOUT 7
GOTO Flag2
Flag1:OFF TIMEOUT 7
CLEAR @gpib
PRINT “Timeout Occurred”
OUTPUT @gpib;”TRIGger:ASTate ‘DISARM’”
Flag2:END