What is the Step Response of the 701280 Frequency Input Module for a Sine Wave Filtered with an IIR LP Filter?

For the 701280 Frequency Input Module with a 4th order IIR 6Hz lowpass filter, a 60Hz sine wave (FM modulated with a square wave) was measured with deviations of ± 3Hz. Please download and view the attached image for a screenshot of multiple measurements.

The top waveform is the output of the 701280 module driven with a 60Hz unit step deviated at ± 3Hz. The 701280 module is measuring in Frequency mode.

The middle waveform is the top waveform after an IIR 6Hz LP filter has been applied.
 
The bottom waveform is the 60Hz input sine wave.

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