Measurement-computing DaqView Manuel d'utilisateur télécharger pdf (Page 63)

Detection Panel

The Detection Panel, located in the center of the upper window, provides a means of selecting any one of

several detection criteria. This includes setting limit values for Limit A, and/or Limit B, as applicable. In

regard to detection criteria, the list of options is shown in the figure. Each is self-explanatory, with

exception of the special-case hysteresis mode.

In Hysterisis Mode Output 1 is forced when an outside of window “high” condition triggers it. Output 1

continues until an outside of window “low” condition is exists, at that point Output 2 is forced. The

hysteresis mode allows for updating P2C, DACs, or timers. Refer to your hardware user’s manual for

detailed information and graphic examples.

The Detection Panel

The setting of a detection window must be done with a scan period in mind. This

applies to analog inputs and counter inputs. Quickly changing analog input voltages

can step over a setpoint window if not sampled often enough.

There are three possible solutions for overcoming this problem:

(1) The scan period could be shortened to give more timing resolution on the

counter values or analog values

(2) The setpoint window can be widened by increasing Limit A and/or

lowering Limit B.

(3) A combination of both solutions (1 and 2) could be made.

Reference Note:

If your device supports setpoint configuration, refer to you hardware user’s manual for

discussions of setpoint configuration and examples.

DaqView User’s Guide 888194 The Setpoints Window 11-3

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Measurement-computing DaqView Manuel d'utilisateur Page 63