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S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\meas_pfer_desc.fm
Phase and Frequency Error Measurement Description
Types of Signals PFER can Measure
PFER measurements can be made of these types of input signals.
• Normal GSM TCH burst with mobile station in active cell mode.
• Access (RACH) burst with mobile station in active cell mode.
• Normal GSM TCH burst with mobile station in test mode.
• Access (RACH) burst with mobile station in test mode.
• Bursted signal with GMSK modulation without a valid midamble.
Input Signal Requirements
The PFER measurement will complete and meet its accuracy specification of:
• Frequency error measurement accuracy of
±
12 Hz + timebase reference.
• rms phase error measurement accuracy of less than
±
1 degree.
• Peak phase error measurement accuracy of less than
±
4 degrees.
under these conditions
• Level is between
−15
dBm and +43 dBm.
• Level within
±
3 dB of the expected input level.
• Frequency is within
±
100 kHz of expected input frequency.
Trigger Source
Auto triggering is the recommended trigger source for each measurement allowing the test set may choose the
preferred trigger source. However, the user may want to select the trigger source. Immediate trigger source is
not recommended for PFER measurements.
Table 3. Recommended Trigger Source settings
Input Signal Type
Recommended Trigger Source
Normal GSM TCH burst with mobile
station in active cell mode
Midamble or Amplitude
RACH burst with mobile station in active
cell mode
Midamble or Amplitude
Normal GSM TCH burst with mobile
station in test mode
Amplitude
RACH burst with mobile station in test
mode
Amplitude
Bursted signal with GMSK modulation but
no valid midamble
Amplitude
Non-bursted non-GMSK signals with a
manual frequency offset of +/- 67.7083 kHz
Immediate
Содержание 8960 Series 10
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