LVDT amplifier and components necessities

[rabs]

Hi,

I'm student researcher, I have recently been assigned by my supervisor to determine a suitable LVDT and accompanying equipment for some research experiments that will be undertaken.

I have done my own personal research and still can’t determine 100% what I need. The system that the LVDT will be used on has a NI BNC 2090 which is connected to a DAQ.

 

Is the BNC 2090 compatible with 0-10VDC or + - 10VDC outputs

 

In what cases will it be necessary to use an LVDT amplifier? Is it even necessary to have an amplifier? Are there any cheaper alternatives?

Also, when they say signal conditioner does that refer to the amplifier?

Am correct in saying that DC LVDT's dont require amplifiers and AC LVDT's require amplifiers?

Is it possible to provide a schematic diagram how it all will be connected to eachother?

So far i know that i need a 24vdc power source (depending on what i get) other than the LVDT itself.

 

Sorry for asking so many questions, I am very new to all this.

Thanks

Rabih

[hrh1818]

On Jan 20, 5:10 pm, rabs <x...@no.email> wrote:
> Hi,
>
> I'm student researcher, I have recently been assigned by my supervisor to determine a suitable LVDT and accompanying equipment for some research experiments that will be undertaken.
>
> &nbsp;
>
> I have done my own personal research and still can?t determine 100% what I need. The system that the LVDT will be used on has a NI BNC 2090 which is connected to a DAQ.

The NI BNC 2090 is just a connector panel. No specifications are
provided for maximum voltage rating but it should be able to easily
handle signals between -50 and + 50 VDC. Your first task should be to
find out how many LVDTs are required for your experiment. Next find
out what is the range of displacement you are trying to measure. Is
it milli-inches or inches? What are your accuracy requirements? You
also need to find out your mounting requirements. The easiest to use
is a spring loaded one piece LVDT. Or you may need a separate core
and coil configuration.

Yes you will need a LVDT signal conditioner for your application.
Next you should plan on spending at least 1/2 day using Google to
search for a suitable LVDT and another 1/2 day using Google to search
for LVDT Signal Conditioner. Spending a day searching the Internet
for a suitable LVDT and LVDT Signal Conditioner will go a long way to
answering all of your questions.

Howard
>
> &nbsp;
>
> Is the BNC 2090 compatible with 0-10VDC or + - 10VDC&nbsp;outputs
>
> &nbsp;
>
> In what cases will it be necessary to use an LVDT amplifier? Is it even necessary to have an amplifier? Are there any cheaper alternatives?
>
> Also, when they say signal conditioner does that refer to the amplifier?
>
> &nbsp;
>
> Am correct in saying that DC LVDT's&nbsp;dont require amplifiers and AC LVDT's require amplifiers?
>
> &nbsp;
>
> Is it possible to provide a schematic diagram how it all will be connected to eachother?
>
> &nbsp;
>
> So far i know that i need a 24vdc&nbsp;power source (depending on what&nbsp;i get) other than the LVDT itself.
>
> &nbsp;
>
> Sorry for asking so many questions, I am very new to all this.
>
> Thanks
>
> Rabih

[Matthew_W]

 Hi Rabih,

  The BNC-2090 is fully compatible with analog output from 68-pin M Series, S Series, E Series or B Series DAQ devices. The signal path is very simple, you can see it on page 24 of the manual.
  National Instruments has a portal for LVDT/RVDT/Resolver measurements that can be found here. There are a number of great links to National Instruments articles about understanding LVDT technology in that link.
  Signal Conditioning/Amplification will usually be needed. Signal conditioning to take the AC output and turn it into a DC voltage representative of the LVDT location. Amplification to use the full resolution of the Data Aquisition  device.
  
  There are general schematics of how a LVDT available from the LVDT portal referenced earlier, here is one example.

  Have a great morning,

 MatthewW
 Applications Engineer
 National Instruments

 
 
 

 

 



Message Edited by Matthew W on 01-21-2008 02:45 PM