LakeShore 325 Ramp/Step

[THN]

Hi guys,

Need some help in how to make a ramp with some setpoints, and a step form for the same instrument (lakeshore 325 temperature controller).

I have already read the LakeShore 325 manual, that says i can make as many setpoints as i want, and divide the ramp in various segments.

That was exactly what i want to do, i want to allow a maximum of 4 segments per ramp. I can't use the PID controller. And i'm not sure how to do it, because the ramp VI from the instrument driver only allows 1 setpoint to wire. Do i have to put that in a loop, with a interval of temperatures? Like, from 200 to 300K, then insert a setpoint with a delay, etc. I'm pretty confused with how to do it.

If anyone, knows how to work with it, let me know, please.

Thanks.

[THN]

And the Ramp VI available with the instrument driver, only allows to wire a bolean (T/F) into the setpoint of the ramp.. 😐

[R_Duval]

Hi THN,

Do you use the PID toolkit?

Have a look at this KB : How Can I Generate Setpoint Profile in LabVIEW For a Control Application?

Hope this helps. 

Could you share your instrument driver too please?

Thanks in advance.

Best Regards.

[THN]

 Hi Romain,

Thanks for your reply, i was missing 1 of the drivers function that was "configure de setpoint", which means that i was trying to make the ramp with the function "configure ramp" but the only option there for the setpoint was to wire to a boolean. And that was my problem.

Now, i'm having some questions about the best way to do the loops. From 1 max temperature to a minimum, the ramp will have rate, after that max or min been reached, i will have to do a delay for cooling and stability. And i will have to introduce a new max and min (2 setpoints..i think) and the new rate for the ramp. I dunno if i'm explaining well. Tell me if you understand me.

Thanks for your reply.

[THN]

If you want i can add the instrument driver in attachment.

Any tip will be welcome. Thanks

[THN]

Is this heading the good way?

Please leave me some feedback.

Thanks.