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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_fm_desc.fm
Frequency Modulation (FM) Measurement Description
Filter Type
The following filters are available to make measurements on the demodulated FM (baseband) signal.
• None - no filtering is provided (default).
• 100 Hz BW Band Pass Filter (Tunable) - The 100 Hz BW BPF Center Frequency setting is available when
this filter is selected, and can be set in the range of 300 Hz to 15 kHz.
• C-Message
• 50 Hz to 15 kHz
• 300 Hz to 15 kHz
Detector Type
Select the type of detector to use when making FM deviation measurements: RMS, Peak+, Peak-. The Peak+
and Peak- detectors measure the greatest positive or negative frequency excursion in carrier frequency during
the sample. The RMS detector measures the root mean squared value. This setting does not affect the
distortion measurement.
De-emphasis State
Select On or Off to enable or disable (respectively) 750 µs de-emphasis.
Expandor State
Select On to compensate for signal compression on the mobile’s transmitted signal.
Related Topics
“Programming a Frequency Modulation (FM) Measurement” on page 169
“Frequency Modulation (FM) Troubleshooting” on page 710
“Statistical Measurement Results” on page 216
“Timeouts” on page 217
“Triggering of Measurements” on page 218
“Test Adherence to Standards” on page 76
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