Questions tagged [calibration]

Correlate the readings of an instrument, sensor, etc. with those of a standard in order to check its accuracy. Adjust experimental results to take external factors into account or to allow comparison with other data.

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1answer
384 views

How to calibrate ACS712 current sensor for a 3v3 MCU (Adafruit Feather M0 with LoRa module)?

This is my first question in Stack Exchange. I'm completely new to Electronics, but I hope my question is meaningful. I'm in the process of measuring voltages and currents in my off-grid solar PV ...
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2answers
1k views

Why do compass chips in cellphones require frequent calibration?

Most cell phones offer digital compass functionality which uses a 3-axis magnetometer chip for data. Phones (some more than others?) frequently require the user to "recalibrate", which involves ...
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1answer
634 views

How to correct/adjust floor temperature sensor resistance to account for calibration error?

I have a heating system with 10kohm floor temperature sensor cable connected to controller unit. The controller displays floor temperature around 7.0 degC higher than reality, the sensor is installed ...
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43 views

Old Fluke 23 service manual?

I'm looking for my old Fluke 23 service or calibration manual but all the Fluke 23 I find in a google search are the series II or series III. Mine is the oldest I guess, it has no series. Thanks. ...
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1answer
68 views

Device RF input calibration setup

A device requires RF input calibration. The input signal specification is: CW, 60MHz, 0.0 dBm. The user manual recommends setup 1 (fig below). Provided that the Signal Generator is capable of ...
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3answers
34 views

Fine-tuning/calibrating DS18b20 thermometer via 1-wire

I am trying to enable remote reading of the temperature gauges in my furnace room by adding DS18B20 thermometers. Since I had some Raspberry Pis and DS18B20s, and ...
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26 views

Centering joystick potentiometers in a controller

I've replaced a joystick in my Dual Shock 4 controller, because it was getting stuck. The readings of the new joystick are offset to right and down. I've read that you can recenter the readings by ...
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0answers
146 views

Calibrating RTL-SDR Power with 50 Ohm Load and Thermal/LNA Noise

Ultimately I'm generating some spectrum plots in L-Band (1200-1800 MHz) and I need to get calibrated flux units (dBm/Hz) for my y-axis. I need a little assistance on creating this memo. I've been ...
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2answers
38 views

MPU9250 Gyro Calibration-Offset

I'm working with mpu9250 gyroscope and I got fine measurements for beginning period (few minutes). I calculated offset at start in manner to average sum of first 1000 results from mpu9250 gyro. But If ...
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31 views

Is my magnetometer calibrated correctly?

I am calibrating the AK8963 on the MPU9250. The first plot shows original mag readings and the last plot shows readings corrected for soft and hard bias. I am following the guidance of Kris Winer: ...
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2answers
571 views

Innova 3320 multimeter calibration

Anyone have experience adjusting the Voltage reading on these? My less expensive meters have a single pot for calibrating, but this one has three. Labeled on the circuit board as V1, V2, and V3. I'd ...
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39 views

How to change get positive value on my weighting Scale?

My weighting Scale is working fine when I keep weight after the start. But I am getting stuck when I keep weight before starting my weighing device. When I do this auto-calibrate with available weight....
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64 views

STM32 runtime Variable value manipulation

So basically I am not an expert, altho I think I have a good basis of knowledge. I am using an STM32 Cortex 4 (discovery) for a hobby CNC machining application. So lets assume we have a SW under ...
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56 views

Tektronix P6015 Replacement Potentiometer Considerations

I’ve acquired (saved from the landfill) an old Tektronix high voltage probe, model P6015. The probe body and cable are in decent condition, but I discovered two damaged potentiometers in the ...
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3answers
218 views

Automotive accelerometer calibration

I would like to design a device which measures acceleration, yaw, pitch and roll for motorsport/automotive application. I plan on using an analog accelerometer, to provide better bandwidth and low ...
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1answer
81 views

Calibration of response of electronics : LTSpice [closed]

I would like to calibrate my electronics. Row signal is something like pulse-A, width is 40nsec. When I input this signal to preamplifier, output is something like pulse-B. I would like to calibrate ...
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1answer
109 views

How to calculate measurement error in an exponentially non-linear sensor? (self made pressure sensor)

I'm trying to calculate the measurement error from a home-made pressure sensor which I have in a voltage divider circuit. It has the same negative exponential non-linear resistance characteristics as ...
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7answers
4k views

How do we know that voltmeters are accurate?

Something that has always puzzled me is how we know the accuracy of voltmeters. From googling around, it seems that today's digital voltmeters use an ADC. An ADC works by comparing the voltage that is ...
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1answer
126 views

Dual slope ADC circuit

I`m currently building a dual slope ADC with discrete components. As expected, some errors were observed. I have calculated both the gain error and offset error variables. Now that I know these ...
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5answers
2k views

What is the point of Geiger counter calibration?

I understand that the three ways Geiger counters can be calibrated are electronic calibration and energy calibration, which both use a pulse generator, and radiological calibration which uses a check ...
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61 views

Magnetometer hard iron / soft iron calibration-compensation

I have real magnetometer data captured by BMX055. I deployed an hard-soft iron calibration code (magcal) on this data in Matlab. Here is the code: ...
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0answers
34 views

EMC-BCI. Coil injection and probe were calibrated at 100 ohm

As the title says my coil injection and coil probe were calibrated into 100 ohm loop line Impedance and it resulted an insertion loss (dB) for the coil injection. and transfer impedance (dBΩ) coil ...
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41 views

How to Design method to Program & Calibrate a Panel of PCBs

I'm designing a sensor-package PCB which needs to be programmed and calibrated while still in a panel of 10. I'd like to avoid a large bed-of-nails type setup for this step so that the panel can ...
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139 views

UDS vs XCP (Diagnostic)

When performing a calibration or a diagnosis acquisition from an ECU using a CAN-bus is there a protocol preferred? I've come across UDS and XCP but I can't quite get why one might be preferred over ...
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2answers
58 views

Unexpected YAW angle from magnetometer

I have some doubts about a magnetometer application. I am trying to get YAW angle value from magnetometer data and so I am doing the following: ...
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Calibrating a k type themperature probe for a PID controller

I just purchased an inkbird PID controller with a k probe to controll a temperature in an oven. I calibrated the k probe at 60F using a trusted digital thermometer with 2 probes. I installed the probe ...
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2answers
232 views

What device can I use as a load to calibrate a power meter accurately?

In old times calibrating a power meter was as easy as connecting 1x, 2x, 3x high power halogen bulbs to get realistic data, free of reactive power or strange waveforms with strong harmonics. Nowadays ...
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1answer
1k views

Thermistor Calibration

I'm currently undertaking a project that uses a thermistor and a voltage divider circuit to calculate the temperature. I'm reading the voltage into my Arduino Uno. I've set up a room temperature test ...
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1answer
41 views

Sensor input calibration for wider range

I get minimum voltage output from my sensor as 2.2V and max voltage as 2.65V. I want to change this voltage to 0-5V range so that the controller ADC can calibrate input in a wider range. How can I do ...
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7answers
33k views

Do digital multimeters require calibration?

This article Understanding Digital Multimeter DMM Specifications / Specs mention A digital multimeter will only be able to meet its specifications when it is within a certain environment. Conditions ...
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2answers
59 views

Linearizing a load cell

As I understand it most load cells (all?) are only approximately linear. To improve the linearity would a 3 point calibration be sufficient? For example, at no load, half load and maximum load. If so, ...
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1answer
793 views

What makes OSL (Open Short Load) calibrators so expensive/sophisticated?

An OSL that can go up to the GHZ can costs several hundreds if not thousands of dollars, what makes them so special? My theory is that a load involves some sort of special resistor and mantaining a ...
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2answers
720 views

How to debug new Brushless DC motor not working? [closed]

I'm building an autonomous boat, for which I so far used this brushless motor powered by this drone ESC (both pictured above). I now want to start using a more efficient motor, so I bought the 12V ...
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29 views

Correction factor for monitor based off orthogonal regression

I'm seeking some clarity about providing a correction factor for an instrument based off orthogonal regression. Currently I have a machine I built myself, co-located with a reference monitor recording ...
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1answer
119 views

CNC feedback mechanism

The GRBL library for Arduino looks very comprehensive but I like to understand how things work before I try to build them. Something I don't understand is how these systems get positional feedback. I ...
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1answer
58 views

How to resolve the drift around Z axis in MU6050 Gyroscope?

For IMU 6050, one could use the accelerometer to calibrate for the drift in x and y rotational axis by applying a complementary filter. However, I haven't found a way to calibrate for the drift in z ...
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3answers
183 views

how to calibrate my multimeter temperature probe

I have a multimeter with the following temperature accuracy for its Type K probe ±3% of reading ±5C The display is in steps of 1C I attempted some calibration: In ...
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1answer
126 views

Calibrate/adjust sensitivity of a 801S Vibration Sensor Module

I have some 801S Vibration Sensor Module I want to use for a project, but I need to make sure they have the same sensitivity. The sensor module has a potentiometer which makes it possible to adjust ...
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0answers
2k views

How to calculate total ADC error after adjustment/calibration?

I’ve some different ADC channels, extended/standard channels and Precision channels. So far I know should the TUE (total unadjusted error) be calculated like this: \$ TUE = \sqrt{e_{offset}^2 + e_{...
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1answer
41 views

Calbration of an infrared sensor

I found on a site that it is important to know the temperature of the infrared sensor while calibrating the infra red sensor, but I could not find the real reason behind this. Anyone knows it?
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1answer
25 views

How to calibrate any magnetometer when sensor is changing the location?

I found magnetometer calibration is done for soft/hard distortions also for tilt compensation using gyro data as well, but all of them perform for know step of the procedure (rotating aligned with ...
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0answers
474 views

Load cell continually increases or decreases

I am using a load cell that is wired to a HX711 amp in the following manner: . I have been attempting to use the calibration example code that is included in the HX711_ADC library (code listed bellow)...
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4answers
2k views

How viable is it to just use 1% resistors and calibrate out the error?

At the moment, I use 0.1% resistors to get accurate voltage measurement through a voltage divider. However, the cost is high, so I was thinking of using 0.5% or 1% resistors and calibrating out the ...
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1answer
66 views

What should I use as a test load to calibrate a UPS?

I have a 1440VA (980W) Uninterruptable Power Supply (UPS) which I bought a while back to protect my computers from power fluctuations and possible outages. Recently the battery failed and so I ...
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1answer
198 views

Soldered wire or test connector for VNA measurement?

I am designing a PCB for a IoT device, which will have an antenna inside a space-constrained plastic enclosure with metal screws. I know that I will have to tune the frequency response of the antenna ...
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1answer
43 views

Offset Error Changing after Calibration of Output

I have a circuit (shown in figure 1) that is supposed to function as a precision analog output. It outputs a DC voltage in the range of either ±10V or ±5V, depending on which gain resistors are used. ...
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34 views

ESC motor calibrated, but still beeping and not responding

I am using this motor called abcGoodefg RC 2200Kv brushless motor. At first, when we followed the sample code on this website, things went well. But when we changed 1000 and 2000 to 10 and 20, ...
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2answers
142 views

One port Vector Network Analyzer (VNA) Calibration without the given standard Calibration Kit

I am trying to do a one port VNA calibration for measuring filters at the GHz band. The VNA that I am using is Keysight E5063A. However, I am running into some conceptual as well as some practical ...
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1answer
35 views

Creating a calibration table for a power sensor

I have been tasked with creating a calibration equation for a power sensor. I have taken data with a calibrated signal generator and have plotted the various frequencies. Now I need to understand the ...
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2answers
217 views

Agilent 4294A Impedance Analyzer: “Bridge Unbalanced” during calibration

I am having problems calibrating my test fixture for the Agilent 4294A Impedance Analyzer. The open measurement always works, but with the short measurement I always get the error message "Bridge ...