Spectrum Controls 1756sc-OF8H Series A - Manual (Page 57)

Chapter 5: 1756sc-IF8H Channel Configuration, Data, and Status 43
TA = User specified digital filter time constant (Seconds)
Xn = Current value, unfiltered peak voltage (PV)
Using a step input change to illustrate the filter response, as shown below,
you can see that when the digital filter time constant elapses, 63.2% of the
total response is reached, each additional time constant achieves 63.2% of
the remaining response.
0.5
63%
Amplitude
(Not to scale)
Time
Unfiltered
TA = 0.01 Sec
TA = 0.50 Sec
TA = 0.99 Sec
0.0
0.01 0.99