Circuit design through DAQ

[jose_1819]

Good I would like to know if I could do the following: I have mounted the circuit of the Figure in a breadboard, which contains 3 resistors and an NPN transistor. I would like to know if you could get the characteristic (IC / VCE) in DC from the NPN transistor through DAQ. To draw the characteristic would be worth with a graph.

[Bob_Schor]

I don't know enough about transistors and what it is you want to do to give a good answer to your question.  You need to ask questions such as the following:

• What voltages do I need to deliver?
• How much current does my voltage source need to provide?
• Are there any timing considerations (particularly "fast" timing), or can I simply let the voltage ramp up slowly?
• What voltage range will I be reading?  [I presume it will be less than the Voltage you are delivering, so probably is mostly a non-issue ...]

Once you have these values, you can see if your DAQ device is capable of acting as the Voltage/Current source (probably the more "difficult" constraint).

Bob Schor

[RTSLVU]

I am sure you could calculate base current by measuring the voltage drop across RB and Vce be measuring the voltage C-E voltage drop.

The only problem I see is you need a DAQ with differential inputs, and as I recall the USB-6008 is single ended so all the analog inputs have a common ground. 

[JÞB]

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@RTSLVU wrote:

I am sure you could calculate base current by measuring the voltage drop across RB and Vce be measuring the voltage C-E voltage drop.

The only problem I see is you need a DAQ with differential inputs, and as I recall the USB-6008 is single ended so all the analog inputs have a common ground. 

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You recall incorrectly, 🙂

[jose_1819]

What I want to do is get the characteristics of the transistor (like the one in the image), but from my previous circuit taking into account the input voltage value (5V) and the resistance values ​​and I would not have the value of the intensity. It is to obtain the characteristic of IC / VCE and IB / VBE. The circuit is already mounted, the only thing I do not know very well how to make the block diagram.

[GerdW]

Hi Jose,

What I want to do is get the characteristics of the transistor … taking into account the input voltage value (5V)

When you want to get the transistor characteristics you should use an adjustable voltage supply. And you should not supply both B and C from the very same source using fixed resistors.

the only thing I do not know very well how to make the block diagram.

Then you need to:

- develop an algorithm on a sheet of paper

- implement this algorithm in LabVIEW

It will help to:

- learn LabVIEW before starting to program

- study the example VIs coming with LabVIEW

- learn DAQmx basics

What does your current VI look like? Where do you have problems with?