Gradient trigger

[Hilby]

Hallo and once again another question:

I would like to have some kind of gradient monitoring. For this purpose I would like to have some kind of gradient trigger which is watching the voltage difference between two points of time.

Maybe something like TTL high when the dU/dt is greater than 5V/sec So if the voltage drops from 10V to 5 V within the last second the trigger should give TTL high, but not if the voltage dropps from 10.0V to 9.5V within 0.1 seconds and also not when the voltage dropps from 10V to 5V within the last hour. The voltage is variable and I just want to look for fast Voltage dropps/rises.

Thanks a lot and goodbye

Hilby 

[CJ_Butler__DASYLab_Pro]

This is exactly the Trigger on Demand module - it output a pulse when the input values changes by the amount specified.

The help even shows how it works... 

[Hilby]

Hallo cj!

Thank you for your ongoing help.

I found the Demand module before I asked here in the forum. But if the module does what I need I do not know how. How can I define an intervall in which a voltage rise appears?

What I need is a trigger which detects fast voltage variation. Slow voltage drop should not trigger and also very short voltage drops should not trigger. The Demand trigger has a reference value and triggers if the voltage rises or drops by a defined value. That is not what I need.

Thanks and best regards

Hilby

[CJ_Butler__DASYLab_Pro]

You can use the derivation module to compute the slope, and then use the Trigger on Demand on the slope.... 

[Hilby]

Okay, I will try this as soon as possible!

Thanks a lot, I will give you feedback if it is working!

Hilby

[Hilby · Accepted solution]

Hello cj, i have a solution for my problem now.

I am using a time delay module and a math module for this purpose.

Have a nce day

Hilby