| A filter is a circuit that separates some frequencies from others within mixed-frequency signals. It is used for preprocessing in measurement.NF has various kinds of active filters. The abundance of filters extends the range of choices.
 
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                        | Cutoff frequency | 0.1Hz to 21.8kHz 2-digit setting with five ranges
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                        | Rolloff | 24dB/oct (lowpass and highpass) 1/3 oct bandwidth(Bandpass)
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                        | No. of channel | 1 |  
                        | Filter mode | Lowpass, Highpass, Bandpass, Bandelimination or THRU |  
                        | Filter type | Highpass: Maximum flatness, Lowpass: Maximum flatness or phase-linear, switchable |  
                        | Gain setting | 0dB to 20dB, switchable (± 0.5dB) |  
                        | Power requirements | AC100, 120, 220 or 240V ± 10% switchable |  
                        | Dimensions (mm) | 216(W) X 132.5(H) X 290(D) |  
                        | Weight | Approx. 2.6kg 
 
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