Orfs Troubleshooting; Possible Setup Issues - Agilent Technologies 8960 10 Series Reference Manual

ORFS Troubleshooting

Possible Setup Issues

During remote operation of the Output RF Spectrum measurement the user should configure the trigger arm
to single, see "SETup:ORFSpectrum" on page
Failure to set trigger arm to single may result in the measurement never giving 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
ORFS due to modulation measurements: Averaging for each measurement, including the zero offset
measurement, is performed over 40 or more bits on the front and back of the burst, from bit 15 to 60 and bit 87
to 132. ETSI standards only require measuring the back bits 87 to 132. By making measurements on the front
and back of the burst, two measurements per burst are achieved.
When fetching (frequency offsets) for ORFS due to modulation or switching remotely, the values for the offsets
are entered after the " ? ", see
"FETCh:ORFSpectrum:SWITChing:FREQuency[:OFFSet][:MAXimum]?" on page 327
The ORFS Transmit Power, 30 kHz BW Power, Max switching offset level and Average switching offset level
results are shifted in proportion to the value of Amplitude Offset that a user may set. The following table
shows the measurements that are affected and how amplitude offset affects them. For more information about
amplitude offset commands, see
Table 2. Measurements affected by amplitude offset
Amplitude Offset Command
OUTPUT 714;"SYSTEM:CORRECTION:SGAIN -3"
!Offset for 3 dB of loss in the network.
OUTPUT 714;"SYSTEM:CORRECTION:SGAIN 3"
!Offset for 3 dB of gain in the network.
OUTPUT 714;"SYSTEM:CORRECTION:SGAIN 0"
!Zero dB of offset.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
412.
"FETCh:ORFSpectrum:MODulation:FREQuency[:OFFSet]?" on page 325
"Measurement Related Configuration" on page
Transmit
6.74
6.75
6.67
S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\ts_orfs.fm
"Measurement States" on page
Power Switching Offset
(dBm)
ORFS 30 kHz Max
BW
-1.42 -35.60
-1.66 -35.71
-1.18 -35.64
ORFS Troubleshooting
for GPIB commands.
563.
Cell
Level Power
(dBm) Setting
(dBm)
Average
(up to 8)
-36.07 -82
-36.09 -88
-36.09 -85
150.
or
80