feedback analog voltage output to control heater

[learnandapply]

I am planning to control the temperature of a minco heater by control its voltage. The whole process uses a feedback loop, a temperature dynamic value is measured by a thermistor which converts the temperture to a resistence value. This step I did successfully using LabView.

Then next, based on the current reading value of resistence I want to update the driving voltage  of the heater. The read and update cycle is pretty low about 1 second preiod. Does anyone know which hardware can allow me to do this (output a voltage dynamically in the rate of one second). Many thanks.

Jie

[devchander]

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I want to update the driving voltage  of the heater. The read and update cycle is pretty low about 1 second preiod. Does anyone know which hardware can allow me to do this (output a voltage dynamically in the rate of one second).

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What input range you want to read?? and what values of driving voltege that you want to generate??

This info is needed to select a suitable hardware

[learnandapply]

Thanks a lot for your reply, I really appreciate!

The output rang of voltage is not stringent, less than 5 volts will be ok. Eventually I will send this ouput to another power supply which will take this input, amplify it and then send to drive the heater.

The input value will be converted from the thermistor reading using LabView and generate a number out, i.e. thermistor reads 10KOhm will be converted to, let's say,  4 volts.

Jie

[Travis G.]

Hello Jie,

Form your description of your application, it sounds like you could benefit from using an M Series Multifunction DAQ Device.  These devices are multifunctional, allowing you to perform analog input measurements and analog output generation with a single device.  Take a look at the specifications found on the product page for these devices to make sure that the analog output channels can provide enough current and voltage to meet your needs.

Travis G.
Applications Engineering
National Instruments
www.ni.com/support