The potential cause for this issues is that too large of a hysteresis band is being calculated because the input range is set too high. The hysteresis value in the Fast Response Output extension is a percentage of the total channel range. For example, if the input range is 10 V and the hysteresis is set at 10%, the hysteresis region is 1 V above or below the set activation level. Change the range in LabChart to a smaller value that better suits the signal being input, and the Fast Response Output extension will output the pulses correctly.
For further technical assistance with this or any other issue, please contact ADInstruments Technical Support by clicking HERE.