Hi All,

First time use here, so please be gentle.

I'm a PhD student in Biology and I'm working on a project that requires strain gages in a wheatstone bridge formation to measure force produced by insect wingbeats. However, my old signal amplifier (https://www.wpiinc.com/products/top-products/sys-tbm4m-transbridge-transducer-amplifier/) died on me so I'm looking for cheap alternative to get the signal out of my strain gages. Any help goes a long way.

David

 

hi David,
There are a number of different types of Instrumentation Amplifiers available.
How are you planning to mount the strain gauges and what signal levels do expect before and after amplification.?

E

 

Hi David & Welcome to All About Circuits.

Formerly I used quite a bit of Micro Measurement's strain gauges and strain gauge conditioners. They have since become a member of the Vishay Group. It also appears your original unit is still available leaving you the option of replacing it or possible send in for repairs and finally possibly repair it yourself. There is also the option of building your own new unit around your specific use and needs. Being a biology orientated type you may do well to use any of the first options. However, that remains your choice. When "cheap alternative" is calculated in that points to building your own strain gauge conditioner and amplifier. Your bridge configuration and instrumentation amplifire needs will determine what would work best for you and that brings us around to Eric Gibbs questions above. Starting with strain gauge(s) used and configuration.

Ron

 

hi David,
There are a number of different types of Instrumentation Amplifiers available.
How are you planning to mount the strain gauges and what signal levels do expect before and after amplification.?

E

Hey Eric,

My strain gages are Omega Linear Strain Gages 120 Ohms, http://www.omega.com/pptst/SGD_LINEAR1-AXIS.html, the strain gages are mounted in a full wheatstone bridge formation to the top and underside of an aluminum razor blade. As per the signal level.... honestly no clue.

David