Spectrum Controls 1756sc-IF8u - Manual (Page 61)

Chapter 5: Channel Configuration, Data, and Status 49
.DigitalFilter
0- 32767 ms INT
The time constant for a digital first order lag filter applied to the input data
for smoothing noise transients. 0 = no digital filter. 100 = data will
achieve 63.2% of its value in 100ms.