Skip to main content

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.

Filter by
Sorted by
Tagged with
2 votes
1 answer
89 views

Mysterious artifacts in my strain gauge data. Can anyone suggest a possible source? [closed]

I'm working on a project where we are collecting timeseries data from multiple strain gauges. We are seeing a strange pattern of artifacts in our data. The artifacts appear as sharp 'spikes' with a ...
pnadeau's user avatar
  • 121
0 votes
0 answers
101 views

Simplest way to connect a single strain gauge to HX711

I want to make a machine end-stop trigger using a strain gauge in a location where regular end-stop simply wouldn't fit - a moving part pushing against end-of-track bar, detect the bar is under strain,...
SF.'s user avatar
  • 1,212
0 votes
0 answers
47 views

Bad AC response from bridge circuit

Followup to this question. Hi. I have the following bridge circuit to simulate a strain gauge. I am conducting an AC sweep of it as another part of my circuit (currently disconnected) that uses the ...
HFOrangefish's user avatar
0 votes
1 answer
210 views

Load cell simulator-mV/volt generation

I am trying to simulate a full bridge sensor load cell. Here is the reff to the image: https://www.scribd.com/doc/140674267/Load-Cell-Simulator-v2 Above is the reff circuit I am using. I know that ...
Altroz's user avatar
  • 1
0 votes
1 answer
105 views

How do I calculate the minimum deflection I can sense with a strain gauge, like the BF350-3AA?

I have a strain gauge (the BF350-3AA), and I will be connecting it to an HX711-based amplifier sensor. From its low-quality datasheet, I've pulled out the following figures: Nominal Resistance: 350 ...
HumpbackWhale194's user avatar
3 votes
1 answer
155 views

How to demodulate a signal that was frequency-modulated by an offset sine?

I have a strain-gauge (SG) in a Wheatstone-bridge (WB) configuration that I would like to measure on the 0-250Hz band on 16 bit ...
davidanderle's user avatar
0 votes
2 answers
62 views

Is there a switch that turns on when it detects a "pull" of a few grams on a string?

I'm working on my first Raspberry Pi project. I'd like to turn my project "on" when a force, of a few grams, is applied to a string (i.e. "pull the string" to turn the unit on, the ...
Offswitch's user avatar
3 votes
3 answers
1k views

Creating a Strain Gauge Load Cell

I want to make my own load cell; how specific do the materials need to be? For example, is it necessary to buy all the cleaning and gluing equipment shown in strain gauge installation videos? Or can I ...
kenntnisse's user avatar
0 votes
1 answer
218 views

Find gauge factor of a strain gauge

I have recently bought a few strain gauges (BX 120-3AA) of resistance 120 ohm. As I bought it from a local market I do not have any datasheet of it. How do I find the gauge factor? I guess it's ...
Kishore Kumar S's user avatar
1 vote
1 answer
158 views

Strain gauge connected to op-amp: finding its range of measurement

Given here (copied below) is a quarter strain gauge with R1 = R2 = R3 = R4 = R = 120 Ω and R4 = R + ΔR as the variable resistance, where the change ΔR is caused due to mechanical forces applied to ...
Awe Kumar Jha's user avatar
1 vote
4 answers
564 views

Are the assumptions for a Wheatstone bridge still valid while connected to a differential op-amp?

While analyzing the Wheatstone bridge independently, the same current is considered to pass through both resistors in each branch of the bridge (i1=i3 & i2=i4.) I've seen the same assumption was ...
Tomas's user avatar
  • 91
1 vote
1 answer
42 views

Vibration and noise pickup from a "quiet" machine base

I am trying to do a noise/vibration profile on a piece of machinery in an incubator. Ideally, it should not be subject to vibration, but inevitably there will be some. In addition to the internal ...
Dirk Bruere's user avatar
0 votes
2 answers
706 views

What is the maximum frequency that I can get reliable weight data from a strain gauge load cell?

I need to build a scale that uses a strain gauge load cell such as the one below: https://cdn.sparkfun.com/datasheets/Sensors/ForceFlex/TAL220M4M5Update.pdf The weight data will need to be stored with ...
dataengineer22's user avatar
0 votes
1 answer
191 views

Strange behaviour of a Wheatstone bridge

I am trying to do some strain measurements. I am using a strain gauge in a Wheatstone bridge configuration. The connection is shown in the image below: simulate this circuit – Schematic created ...
Kishore Kumar S's user avatar
3 votes
1 answer
133 views

Instrumentation opamp saturating

I'm building a circuit to measure signal out of a wheatstone bridge for strain gauge. here is the schematic: simulate this circuit – Schematic created using CircuitLab I applied +-1.5V with ...
cola chicken's user avatar
0 votes
2 answers
296 views

Which amplifier module to use for strain gauge/thermocouple voltage measurements through multimeter? [closed]

I wish to measure the voltage difference across the ends of my load cell and thermocouple using a multimeter, but my multimeter cannot accurately read such small voltages. The range of voltages to be ...
Atharva's user avatar
  • 51
0 votes
1 answer
281 views

AD620 input voltage range identification

I wish to buy this AD620 amplifier module for amplifying my strain gauge voltage. I also wish to use it with my thermocouple. Basically, I want to accurately read DC voltage values from around 0.1 mV ...
Atharva's user avatar
  • 51
1 vote
2 answers
309 views

LM358 input voltage range identification

I wish to buy this LM358 amplifier module for amplifying my strain gauge voltage. I also wish to use it with my thermocouple. Basically, I want to accurately read voltage values from around 0.1 mV to ...
Atharva's user avatar
  • 51
3 votes
5 answers
664 views

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 ...
cola chicken's user avatar
0 votes
1 answer
112 views

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 ...
Jack B's user avatar
  • 12.2k
0 votes
3 answers
184 views

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 ...
user4574's user avatar
  • 12.4k
1 vote
1 answer
573 views

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 ...
mosfeta's user avatar
  • 25
0 votes
1 answer
821 views

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 ...
R Spandit's user avatar
0 votes
3 answers
630 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 ...
Joe Vaccarella's user avatar
0 votes
1 answer
483 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 ...
Zander's user avatar
  • 3
0 votes
2 answers
104 views

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 ...
needbrainscratched's user avatar
0 votes
1 answer
265 views

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 ...
Amandeep Singh's user avatar
2 votes
2 answers
94 views

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

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?
AlekseyFedorovich's user avatar
0 votes
2 answers
139 views

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 ...
Don Wilson's user avatar
0 votes
0 answers
50 views

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 ...
raaymaan's user avatar
  • 1,364
0 votes
1 answer
93 views

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 ...
KMC's user avatar
  • 1,428
7 votes
7 answers
5k views

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....
hegemon8's user avatar
  • 115
2 votes
1 answer
201 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 ...
KMC's user avatar
  • 1,428
1 vote
1 answer
69 views

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?...
Ilie Razvan's user avatar
0 votes
0 answers
143 views

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 ...
Mkk0's user avatar
  • 1
2 votes
0 answers
1k views

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 ...
AlMa's user avatar
  • 123
0 votes
0 answers
296 views

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 ...
Jalakam Kiran's user avatar
1 vote
1 answer
483 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 ...
Ben's user avatar
  • 625
0 votes
1 answer
983 views

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 ...
Miomio's user avatar
  • 123
0 votes
0 answers
3k views

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 ...
Johan Arcos's user avatar
0 votes
1 answer
68 views

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 ...
Ashesh Shrestha's user avatar
0 votes
0 answers
631 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. ...
LazyLabor's user avatar
0 votes
2 answers
312 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 ...
Rekamanon's user avatar
  • 111
0 votes
0 answers
46 views

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 ...
BigRedMachine's user avatar
12 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 ...
Brethlosze's user avatar
  • 1,427
-2 votes
1 answer
727 views

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 ...
Liam's user avatar
  • 1
2 votes
0 answers
474 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 ...
nick1256's user avatar
3 votes
2 answers
1k 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 ...
Shishir Pandey's user avatar
1 vote
1 answer
652 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 ...
Zyzzyphus's user avatar
0 votes
0 answers
102 views

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 ...
gerrgheiser's user avatar