Creating an accurate write to file worksheet that is based on rate of rise of temperature trigger point

[Decco]

In Dasylab 2020 and 2022, I want to be able to write temperature data to a file when that temperature rises on that channel at a rate of 1°Centigrade/sec or 2°C/sec etc i.e I want to be able to set a module or modules up to do this. I have tried various things like a data pre-post trigger module with little success. When each event is detected, I want the logging to the write file to continue for 10 seconds after the event was detected. I want the triggering to be reasonably accurate instead of sporadic .... Could you please suggest the best way of achieving this. I am reading a voltage in from a thermocouple to voltage converter and then scaling to the correct temperature readout. The triggering has to be based on the slope and not absolute values.

Edited July 14, 2022 by Decco
a little more info about it must be slope not absolute

[DAQman]

Hello,

There is no good way to create a Slope trigger that has a value change number as well as minimum time. If you can do with a method to log data every time the value increases/decreases by an amount, use the Trigger on Demand module. It will produce a pulse each time the value changes by the specified amount. Use a Combi Trigger to stretch the pulse to 10 seconds to close a Relay allowing data to flow to a Write Data module for file logging. I've attached a DASYLab 2020.1 example to demonstrate.

Best regards,
John

TriggerOnDemand.DSB

[Decco]

Thank you, John. I will have a play around using that technique