Questions tagged [strain-gage]

A strain gauge measures the physical strain on an object. The most common types are a metallic foil attached to a flexible backing where the resistances changes when subjected to compression or tension.

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Instrumentation amp giving only positive output (with + and - power supplies)

I'm using an instrumentation amp for a bridge circuit for strain gauges. However, the output range is always positive (the lowest value I can get is zero). The amp I use is AD620. For power supply I ...
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1 answer
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What is this logo? ☰M☰M☰ / ☰W☰W☰

Seen on a strain gauge, and looks familiar, but I can't identify the manufacturer. Who makes strain gauges with a logo consisting of: Two letter Ms (or maybe W if it is upside down) Three horizontal ...
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How to make sensor input look like high impedance on loss of 5V power?

I have a strain gauge sensor with a full-scale output of about 8mV and an output impedance of 5K ohms. We will be measuring its value with a max sample rate of 500Hz, and 10 bits of resolution. It ...
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Wheatstone Bridge strain gauge thermal compensation design

I'm designing a full Wheatstone bridge for measuring the bending strain in a steel bar. I have a circuit available to me that uses an ADS1232 to measure the output of the wheatstone bridge. When ...
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Wheatstone bridge BF350 strain gauge to Arduino GPIO HIGH (fast)

Looking to use a strain gauge as a trigger (Z-stop on 3D printer). I also have some other applications for this circuit. Essentially, I want the output from the op amp (TL072 - because of high slew ...
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3 answers
173 views

How do I reduce strain gage drift?

my name is Joe Vaccarella. I am a research assistant at the University of Rochester. I’m currently conducting a project where I have 4 strain gages, mounted on a polycarbonate tube. (one gage on each ...
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133 views

How to stop a high torque stepper motor when a certain amount of load is applied?

I’m looking for some design suggestions for stopping the linear actuation of a platform when too much load is applied to the moving plate, for both normal and axial loads. I mainly do not want to ...
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Does shunt calibration of a sensor also correct for zero error?

In the datasheet for a load cell (shown below), it says that shunt calibration data is given, also they have mentioned the zero balance. Does the shunt calibration consider zero balance? Meaning, do I ...
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Strain gauges' readings at 1 kHz

I want to connect 8 strain gauges to an aluminum scooter frame and capture readings at 1 kHz. The strain gauges are Full bridge 350 ohms with a very small output voltage (in the range of mV). I have ...
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1 vote
1 answer
63 views

What is the use of this component packaged with a strain guage?

I ordered the strain gauge with code 865-6235 from rscomponents. I don't understand the use of the other highlighted part. Can someone help me?
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2 answers
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Problem with op amp output hitting bottom rail on output stage for DIY 3D printed strain gauge. High gain is needed

So the goal is to take our differential input from our experimental full bridge strain gauge and amplify the signal to a gain of roughly 5500. The output signal would then be going into a 12-bit ADC ...
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What are the trade-offs between different values of resistance for a wheatstone bridge?

I have a loadcell with a bridge resistance of 10k and I've asked the manufacturer for a new design with RTDs and a slight mechanical change, and as a consequence, the manufacturer's proposed new ...
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Strain gauge installation tester vs. insulation tester

An insulation tester (or a Megaohmtester) costs in the range of 500-1k USD and can measure up to G-Ohm and more in resistance. Even a big brand tester like Fluke 1587 costs under 1k. Not saying they ...
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6 votes
4 answers
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What kind of a sensor does a arcade punch (boxing) machine have?

I am working on a project, where I have to measure the pressure exerted by a punch. I am trying to understand how an arcade machine works, and see if I could replicate the same mechanism in my project....
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2 votes
1 answer
160 views

Why increasing bridge ratio improve efficiency?

From The Bonded Electrical Resistance Strain Gage by Murray & Miller where it says: For operation with a single gage, and under some conditions with two gauges, the efficiency can be improved by ...
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Common voltage of 2 op amps instrumentation amplifier

I am trying to build an amplifier for a strain gauge sensor using the 2 op amps instrumentation amplifier design provided in the Texas Instruments note: https://www.ti.com/lit/an/sboa247/sboa247.pdf?...
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Strain gauge measurements with carrier frequency

In near future, I would need to do strain gauge measurements using HBMs instruments, the amplifier will be MX1615B. In my case, the gauges will be placed near a 50Hz gearmotor and run with VFD. As far ...
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Strain gauge in a voltage divider

I have a strain gauge mounted in a voltage divider as in the image below: simulate this circuit – Schematic created using CircuitLab where \$R_{g}\$ is the resistance of the strain gauge when ...
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Reduce load cell creep and drift programatically

I am trying to build a weigh scale and have read through the parameters that affect its reading in the long run. My question is can we reduce the Creep and drift of the load cell by compensation ...
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1 vote
1 answer
233 views

Why are two pairs of a wheatstone bridge of opposite direction?

I wonder why are, e.g. when using a wheatstone bridge in combination with strain gauges, two of these SGs do have a positive k-factor and the other two a negative k-factor. Gladly, there is already ...
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4-Wire Strain Gauge Measurement

I want to accurately measure the resistance of a single strain gauge, unaffected by lead wire resistance and with ratiometric ADC conversion to compensate for excitation drifts. I know for RTD ...
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How to connect two load cells to one HX711?

I have two 5 kg load cells and one HX711. The project's goal is to connect them together, and measure the weight of the same object. I would like to get the average in order to make my calculations ...
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1 answer
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Load cell behaving weirdly. Output magnitude of force depends on which side is held and which side force is applied

also asked at: https://forum.arduino.cc/index.php?topic=670246.0 I have a generic load cell (image) and am using Hx711 which is connected to arduino. The code is from Instructables. When I fix and ...
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0 answers
293 views

Loadcell strain gauge with 10 V excitation

I am designing loadcell (spec) measuring using 24-bit adc (MCP3561) with excitation 10 V. But I couldn't find the reference design for 6-wire loadcell that its sense pins connect to ref+ pin of ADC. ...
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2 answers
180 views

Obtaining Accurate Measurements from Strain Gauge

Background I have a strain gauge that I need to obtain measurements from. The product page indicates that the sensor is a half bridge configuration (one active/one compensating element). The sensor ...
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Options for impact sensors?

I'm looking for a sensor to sense impact, let's say the sensor is placed behind a thick metal/wood casing, the impact depending on the amount of force could either deform the casing or only causes ...
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11 votes
2 answers
2k views

Should we use wheatstone bridges nowadays?

For measuring strain gauges, the Wheatstone bridge is the historical choice. In a quarter Wheatstone brigde (\$350 \Omega \$ typically (?)), with a high input impedance amplifier, and some bridge ...
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-1 votes
1 answer
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Operational Amplifier and Strain Gauge

My laboratory involves using a strain gauge and an instrumentation amplifier to amplify the signal from the strain gauge. The op amp schematic is shown below: Any assistance with the following ...
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2 votes
0 answers
304 views

AD7730 calibration failure

EDIT: The exact issue is this, the ADC has a gain register (set during internal FS calibration and again at System FS calibration) and an offset register set during system zero calibration. The ...
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3 votes
2 answers
648 views

How does full wheatstone bridge with strain gauges work?

I have gone through a number of tutorials on Wheatstone bridge and how to use it to sense load using strain gauges. I have also gone through the calculations where one of the resistors of the ...
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1 vote
1 answer
433 views

Why is my amplified strain gauge output so unstable?

I've attached a strain gauge to a bending arm of a robot, and it varies by about 1.5 ohms from 356 to 357.5 ohms. I place this in a Wheatstone bridge. The strain gauge is R3. R1, R2, and R4 are all ...
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Any problem with this strain gauge configuration to increase resolution?

I'm new to using strain gauges, but I've seen the typical 1, 2, and 4 strain gauge wheatstone bridge configurations. Using the diagram below, I'm referring to where R3 is a gauge, or R3 and R4, or all ...
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1 vote
2 answers
134 views

Low current strain gauge

I am trying to make a low power device (based of RSL10 bluetooth SoC) that would sample a strain gauge @1kHz and transmit the measurements. The current drawn by the running SoC is about 1.5mA, while ...
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Wire shield when using connector for strain gauge sensor

I have made strain gauge sensor with 1 strain gauge. Thet gauge is in "bottom" part of Wheatstone brigde (one strain gauge terminal is signal, second is connected to ground). I'm using Sommer CICADA ...
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1 answer
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How to estimate force caused by a strain in a material from a strain guage?

So, I am learning about how strain gauges work and I understand that through stretching or compressing resistance of the staring gauge can be changed which can be measured in resistance accurately ...
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1 answer
486 views

When is one active and one dummy strain gauge preferred to two active strain gauges?

As far as I understand, one active and one dummy strain gauge arrangement can be used for temperature compensation. But even two active strain gauges can be used for temperature compensation, and in ...
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1 answer
210 views

Read data from strain-gauge Labjack, Arduino

I am working on a project where we have to record breathing data. For that we ordered a LabJack U3-LV along a with an amplifier (datasheet) and a belt which is some kind of strain gauge I think. We ...
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1 answer
457 views

Strain gauge amplifier - so much noise!

I'd like to use atmega328p to read force with strain gauge. I'm using one 1k strain gauge and 3x 1k ohms dummy resistors. My circuit looks like that: I'm using DAC to remove offset from bridge. As ...
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1 answer
174 views

Remove bridge offset before ICF amplifier or at FB pin?

I'm making project where I would like to read from stain gauge sensor. It will use only one 1k ohm (or 350 ohm) strain gauge and 3 dummy resistors to complete bridge (1k or 348 ohm). I'd lik to feed ...
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  • 133
0 votes
1 answer
879 views

Wheatstone Bridge - strain gauge sensor

I'm trying to optimize a Wheatstone bridge with a strain gauge sensor and I'm considering all possible wire resistances. The circuit is shown in the following figure: I don't understand the comment ...
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2 votes
1 answer
664 views

What adhesive is best to glue strain gauges to metal?

I'm trying to use these strain gauges to measure bending of a metallic cantilever (metal TBD). Does anyone know what adhesive I can use to glue the strain gauges? I'd rather not have to use an oven ...
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1 answer
147 views

in-amp for strain gauge

I'm working on a project where I should send an overload signal if the strain is bigger than 40 ppm. So far I found this answer: Strategy to balance a Wheatstone bridge for strain measurement The ...
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1 vote
1 answer
4k views

How does temperature compensation work for strain gauge in wheatstone bridge

Wheatstone bridge is used for temperature compensation for strain gauges If 2 strain gauges are connected like this figure. Due to temperature variation; the resistance Rg will change in the same way....
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1 vote
2 answers
723 views

What's the difference between consumer and industrial grade strain gauge adhesive? [closed]

Can I just use normal super glue and epoxy resin to attach a strain gauge?? What am I sacrificing by doing so? Also, how are load cells so cheap and what kind of adhesive / covering do they use?
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2 votes
5 answers
3k views

How much power does a strain gauge use?

Is it essentially nothing given how small they are? I see most configurations are given 5V, but does that mean they draw amperage as well?
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2 answers
1k views

How to reduce noise in strain gauge measurements

I have two strain gauges on a 1 m length wind turbine blade which will rotate at 800 RPM. The amplifier and DAQ system will rotate with the blades. I'll have relatively noise environment and the ...
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2 votes
1 answer
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Error in the gain, Amplifier, DAQ system

I have a strain gauge with maximum output of 5mV. I want to amplify this signal 1000 times in order to use my DAQ system to read it (the analog input range is 0-5V for DAQ connector). I have ...
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  • 23
2 votes
1 answer
1k views

Compensating for offset voltage in bridge measurement before instrumentation amplifier

I'm using an instrumentation amplifier (INA118) to measure the signal from a full bridge strain gauge (tension only, all 4 resistive elements are strain gauges, slow changing (DC) signal). I'm using a ...
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5 votes
1 answer
7k views

LM324 op-amp wheatstone bridge amplifier formula

I'm planning to use an LM324 opamp as a signal amplifier for a cell load (strain gauge in a Wheatstone bridge). This particular application is shown in the datasheet (see image). It shows the ...
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1 answer
426 views

TrackPoint a.k.a pointing stick 2-axis force sensor

I have an application that would benefit from a sensitive two-axis force or bending torque measurement very much like what a pointing stick (a.k.a. TrackPoint) used to do in a ThinkPad, apparently ...
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