Vibration measurement system using accelerometer

Hi,
i have a requirement to design a vibration measurement system 100Hz Bandwidth for analysis of structures using shake table.The method is using accelerometer and data acquisition sytem based on a microcontroller.
One of the requirement is to have a provision to view the sensor output on oscilloscope as well as in the display software on pc,does anybody has an idea how this could be achieved the most optimum way without much noise addition.

one way to use analog output sensor along with some switch at its output connecting to an adc and another port to monitoring port bnc connector,but will be able to connect one at a time.

or split the output to two ports and feed the external bnc connector as well as adc simultaneously,quite complex circuitry involved here.

another way is to use a digital output sensor which is easier to interface,then send the data again through a dac as an output.

Kindly provide suggestions on the same.

Thanking you in anticipation
Venkateshrao

As you should learn and then find a solution, I can recommend the easiest way (I also worked with shaking tables).

Connect an analog sensor to an oscilloscope. Shake the table to see sensor response.
As a sensor, you can use a piezo element coupled to the table and its base so it can be lightly bent by shaking.
You can use a coil with a magnet core, for instance, a small dynamic speaker, again coupled so its coil will follow table movement against the base.
You can use a tensometer, a device changing resistance when stressed by bending; here you will need a DC bias to operate.

If you have a modern "digital" accelerometer, find if it has an analog output; otherwise you must connect an DAC to get the analog output from its digital stream output.

Good luck!

Hi Jiripolivka,

Thanks for your kind suggestions.
i am planning to use a mems accelerometer sensor from analog devices adxl325 which works on differential capacitance principle.A microcontroller is used for data acquisition using a unity gain amplifier and an analog SPDT switch in between the adc and the sensor output.the adc will be connected to one of the output throws of the switch and the other port to a bnc connector for monitoring.
Connecting a dac doesn't seems to be a good option as it will add its own noise which is not desirable for signal analysis purposes.

i have to decide and design it at first go as i don't have the option to buy the modules and test it first.

Hope this configuration works.

once again thanks for your time.