Types Of Signals Orfs Can Measure; Input Signal Requirements - Agilent Technologies 8960 10 Series Reference Manual

Output RF Spectrum Measurement Description
ORFS due to switching
When multiple offsets for the ORFS due to switching measurement are set, the DSP tunes the 30 kHz
resolution bandwidth, 5-pole, synchronously tuned filter to the first requested offset and samples the power of
the signal over the entire burst. The result for this measurement is the maximum of these sampled values and
is reported as an absolute power measurement. The DSP then retunes the filter, samples the signal, processes
the data for each requested offset, then makes the results available to the user.
The 30 kHz bandwidth power at zero offset measurement is not made during ORFS due to switching
measurements. In order to make that measurement, the user must request at least one ORFS due to
modulation measurement.
Single or Multi-Measurements
To obtain statistical measurement results, the multi-measurement count must be set for both switching and
modulation measurements. (See
Changing the multi-measurement modulation or switching count number or setting multi-measurement to
ON allows the test set to make multiple measurements at each frequency offset, thereby providing average
power results across the number of frequency offsets selected. Multi-measurement count state OFF means
only one ORFS measurement will be completed at each offset (that is, one ORFS due to modulation, and one
ORFS due to switching measurement).
• If the user wants to make multiple ORFS due to modulation measurements and no ORFS due to switching
measurements, a number must be entered in the multi-measurement modulation count, and all the
switching offset frequencies must be off.
• In order to make multiple ORFS due to switching measurements and no ORFS due to modulation
measurements, a number must be entered in the multi-measurement switching count, and all modulation
offset frequencies must be off.

Types of Signals ORFS can Measure

ORFS measurements can be made on these types of input signals:
• Normal GSM TCH burst with mobile station in active cell mode.
• Normal GSM TCH burst with mobile station in test mode.
• Non-bursted signal including GMSK modulation with mobile station in test mode.
For a non-bursted signal, an ORFS due to switching measurement result is not useful.

Input Signal Requirements

The ORFS measurement will complete and meet its accuracy specification under the following conditions:
• Level is between −10 dBm and +43 dBm.
• Level within ±3 dB of the expected input level.
• Frequency is within ±200 Hz of expected input frequency.
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"Statistical Measurement Results" on page 136 for more information.)