big trobles with trigger on MIO card

[TSchmid]

Hy im using the multifunction card MIO16E-4 and want to sample some
sinusoidal signals
in labview 6.i on a WINNT4.0 OS
Therefore I'm using the "AI Waveform scan.vi" to get the signal. But the
Trigger that is set on rising takes all the signals on falling and rising,
no importance on the real signal.

There is some smal noice on the 40Hz signal but that should not be up for
trobles
with some 0,01V messuring on +-5V signal amplitude.

It is important to get the signal in rising state and have a multiple of the
Periods with same Samples in messured array. I don't want to invest to much
special programming effort so I used this easy VI.

what can I do ?? what do I do wrong??

THanks for any help in advance.

Tobias

[markwysong]

I don't think you did anything wrong; I think that there is a setting you should know about. If you dig a little deeper, you'll find an input (it's part of an input cluster) called hysteresis. If your trigger occurs, the hysteresis determines when the trigger can happen again. For example, if your trigger is set to rising edge at 5 volts and your hysteresis is .1, then when your trigger occurs at .5, the voltage must go below .4 in order for the trigger to occur again.

Try that first. Hope that helps.

Mark