Get time with DIO and timer

Hi everybody,
I'm new with LabView.
I try to get timestamps when I have a digital input on a NI 6233 card. For that I am using a counter/timer which is synchronising my digital waveform input, like an example shows.
When I calculate the period with two timestamps afterwards I see weird results. (see jpeg)
Does anybody know if this is a software or hardware issue? How can I fix that?´
Attached you can find also the vi.
Attachments:
Period Time.jpg ‏157 KB
Timer.vi ‏41 KB

Hi Patrick,
I try to measure the period of a rotating part. I am using a proximity sensor to give me a digital high signal for each rotation.
In the vi I am using a counter/timer to syncronize my digital input. Afterwards I am using my data signal twice. Once I am using it to get a boolean which starts a case structure. In there I am using the data signal a second time to get my a timestamp which gets also transformed into seconds. I am saving this value to a tdms file.
With this timestamp I am calculating the period in another program. For some reason the period has descrete values which shows the jpeg.
Do you have a better way to get the timestamp or even the period?
Thanks.

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