GSP-830 User Manual 146 EMI FILTER The optional EMI filter (Opt. 05, also called 9kHz/120kHz RBW) is a factory installed optional item used for specific measurement situations such as EMI average detection, where a higher level of sensitivity is required than the standard configuration. When this module is installed, the GSP-830 acquires two additional features: Average/Quasi-peak detection mode, and 9k/120k RBW. Select average/ quasi peak signal detection mode Panel operation 1. Press the Trace key. Trace 2. Press F6 (More). MoreF 6 3. Press F3 (Detection). Detection..F 3 4. The signal detection mode appears. When the EMI filter is installed, F4 (AVG) and F5 (QPeak) becomes available. For signal detection mode details, see page80. NormalF 1SampleF 2Peak+F 3AVGF 4QPeakF 5 Parameter AVG (average) Detects the average power level of the samples using a low pass filter. Useful for smoothing the noise level. QPeak (quasi-peak) Detects the quasi-peak power level of the samples. Useful for viewing in zero span without missing signal variations.