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Beginner bench setup for introduction to analog measurements

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Hi everyone, 

 

I'm looking to setup a system to help take some simle measurements. This setup will be used only by me at my desk/workbench to help me better understand a few machine parts I have as well as do various other troubleshooting on equipment. Some of the most common measurements I want to be able to take are: stress/strain, vibration, temperature, force, torque, and motion.  

 

At this point this project is just small scale. I'm not running PLC's or using the data to help run a plant. This setup will be pretty much just myself, my computer, and some piece of equipment I need to test. 

 

I currently have an NI 6003 for my use which would be preferrable to use but if I need a more heavy duty DAQ then I can get that as needed.

 

My main question is whether or not I can get aqeuate results with the 6003 DAQ and if I would be able to sufficiently condition the accompanying signls or if I need to find a DAQ with higher resoluion and a sufficient signal conditioner. My concern is whether or not I will be able to properly condition signals from piezoelectric sensors when taking vibration measurements. Is there a way to do this to produce viable results or am I going to have to get a more capable DAQ? I'd like to be able to do a frequency analysis on motor shafts running typically at about 60 Hz. It would be nice if I had the capabilty to observe signals of up to 150-200 Hz at least.  For my purposes I don't need incredibly accurate results if I can get away with a more afforable setup. I think a final p value confidence level of (90 %) will be fine at this time. 

 

I'm still quite new to data aquisition and signal conditioning. My goal behind this mainly to learn how to take good measurements properly more than I am concerned with accurate results. 

 

If anyone could give me thier thoughts on this matter I would very appreciative. 

 

Thank you kindly,

 

James

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Accepted by topic author JCG77

James

I think you need to separate out the signal conditioning from the data acquisition. I suggest you look at the Analog Devices 7B series and some of the imitators, e.g. Acromag.

http://www.analog.com/en/products/landing-pages/001/7b/7b-series-overview.html

Essentially you choose a specialist module for each measurement you want. The modules are isolated, minimize signal interference problems. Sensor excitation, e.g. for strain gauges is provided on some modules. You will need to look at the frequency performance to get the 200 Hz on some of the modules.

The modules plug into a motherboard that can then be wired to whatever data acquisition system you like.

Or the multipurpose NI9219 may meet your needs better.

 

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To start a 6003 is ok.  With the time you learn the limitations, and at that time you will better know what you need.

(For vibration tasks I would recomment a simultanious sampling unit with an option to read to a rotation sensor)

 

The joy of engineering is to do what you want with the stuff you can get! 🙂

So: Do you already have sensors/signal conditioners? 

Piezo accelerometers need charge amplifiers...  IEPE sensors a current source ...   same for strain gages and RTDs.

The mentioned 7B modules are a nice way to hook them to your 6003,  for charge and IEPE signalconditioners are on the market (maybe even in 7B format ?? )

Some DAQs already have that build in... in the near future it's christmas 🙂   so I would look for a 4 slot compact daq:

one slot for temp, strain, voltage,

next for a IEPE card (accelerometer) ... 

next a DIO to read incremental encoders, with more timers, and some general purpose DIOs  oh, we are already at 3 slots 😉 

last one spare .. you want to fill it within the next projects 😉  

Well, not a hobby/student unit anymore... 

Greetings from Germany
Henrik

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