Part Number: TIPD170 Other Parts Discussed in Thread: INA826EVM I will be using this strain gauge design in a car (tetsing rods). Their will be a lot of EMI and I would like to add a 200-Ohm Low Pass Filter. Where would you suggest adding this to the…
Part Number: TIPD170 We are using TIPD170: Single-Supply Strain Gauge in a Bridge Configuration Reference Design .
We started testing our strain gauge with this board but we could not get the desired results.
The output of the Amplifier swings …
Part Number: INA333 Other Parts Discussed in Thread: TIPD170 , , LM7705 Tool/software: I made this design. In this design, I aim to measure temperature using PT1000 resistor. The analog input range of the processor is between 0V and 3.3v.
While designing…
Hi Robbie,
Yes you may use one of our instrumentation amplifiers like the INA333: http://www.ti.com/tool/TIPD170
Or you can create your own with 2 amps as shown in this circuit: http://www.ti.com/lit/an/sboa247/sboa247.pdf
-Tamara Alani
Hi Andy,
I still think that the drift comes from the heat dissipation within the bridge resistors. The current of a usual 350R strain gauge bridge should only be about 1mA. But in your circuit a current of 3.6mA is flowing. So, the heat dissipation…
Hello Murugavel,
Please take a look at TIPD170 . TIPD170 is for a strain gauge application but it can be redesigned for a load cell application and the INA333 used in the design can be replace with another instrumentation amplifier that may better fit…
Hi Vishal,
Here is a TI Precision Design that walks through the design of a bridge amplifier: http://www.ti.com/tool/tipd170
You will want to use a well regulated supply for your excitation voltage to reduce measurement errors.
Regards,
Zak…
Hi Ammar,
We have a TI Precision Design that should provide a good starting point. You can find it here:
You will need to make some minor adjustments for zero and full-scale adjustment. For the full scale adjustment, you can just make the gain setting…
Hello Zahra,
There are multiple factors to take into consideration when selecting an op amp (or more likely an instrumentation amplifier) for this application. Therefore I suggest reading TIPD170, which is a strain gauge reference design that utilizes…
Hello Pradeesh,
The impedance of a PT1000 at 25C is ~1.1kohms. Therefore the voltage on the Vin+ node is approximately 825mV.
Vin+=3.3*(1.1k/(1.1k+3.3k))=825mV
The voltage at the Vin- node is approximately 660mV.
Vin-=3.3*(820/(820+3300))=660mV…
