exponential rise in graph for RC network

[astroboy]

For testing NI PCI6220, i construct a simple RC network.Charging and discharging can be controlled switch manually.
Then i set up a simple Chart Graph in Labview But I could not obtain it correct.  I am using LV7.1.
Do I need trigger functions? How do i do that?

regard
Clement

[altenbach]

I don't think you provide enough information to troubleshoot the problem. Is everything working fine except the chart or are there other problems?

How is the chart connected? Would it be possible for you to attach a simplified version of your VI?