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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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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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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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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37 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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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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2answers
59 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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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
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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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114 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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51 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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1answer
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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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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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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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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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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
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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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2answers
184 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
39 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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2answers
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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
745 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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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
83 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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2answers
462 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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3answers
131 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
96 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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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
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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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318 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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1answer
59 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
162 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
38 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
109 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
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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
102 views

Why is this load resistor connected this way and what could be its value?

There is a potentiometer vane and the diagram includes protection components and looks messy, I simplified it by re-drawing as below: The circle R1, R2, R3 and the gap represents the vane's 10k ...
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Question regarding GM Tubes Calibration Frequency

My friend has has been using GM Tubes for more than a decade now. He has been calibrating them once per year. But the calibration data reveals that his GM Tubes would have remained within allowed ...
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1answer
46 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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1answer
49 views

Why does gyroscope drifts and is it possible to use position based calibration to calibrate it?

The MPU 6050 chips has gyroscope and accelermeter, and if you google anywhere they will tell you that the gyroscope drifts, usually at constant rate. My question was, how does this drift come from? ...
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Calibrating FEETECH FR5311M Digital Servo

Hey everyone, I am owning this model feetch servo motor. I want to do the following:(with arduino uno) Read the initial position(angle) of the servo motor rotate the motor to desired position(angle) ...
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343 views

Calculating battery percentage after voltage drops

I would like to display a battery percentage based on the remaining charge in the battery. I do not know if there is a better way of doing it other than measuring the voltage across the batteries. ...
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1answer
303 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
188 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 ...
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2answers
70 views

Tektronix TDS3000 series max trigger rate

So I am making a testing stand for some equipment and I am using an old TDS3034C Tektronix scope for most of my measuring purposes. I've connected it to the computer via Ethernet and using PyVisa to ...
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2answers
117 views

Can linearity of photoreceptor be improved by calibration?

I am trying to determine if equipment I already have can be used to take a reading in mcd/m2, for a quality control test. I have a sensor which meets all the requirements listed in the standard test ...
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4answers
4k views

What's the simplest way to calibrate a thermistor?

As a hobbyist who don't have access to lab equipment, it really seems impossible to me to be able to calibrate the thermistor that i have. Of course there are calibrated temperature sensors like ...
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1answer
60 views

µC control of a force testing machine

At work we have a machine that is used for testing and calibrating force sensors. It basically consists of a huge lever that is actuated by an electric motor with a gear reduction and a calibrated ...
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1answer
540 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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1answer
189 views

Does a gyroscope require calibration? (MPU 6050) [closed]

If it does, what is the method that I need to follow? Any suggestions? Edit: Are these the offsets?
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585 views

How this servomotor calibration is supposed to work at electrical level?

Here is the Wiring Diagram: I am trying to understand how this servo motor calibration process (see screenshot of BMW software) is supposed to work at electrical level. In particular: there is 2-pin ...
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HX711 Load cell providing constant large and negative reading

I'm currently working on a project that uses the HX711 load cell amplifier while connected to a series of strain gauges in a full bridge circuit. I'm using an Arduino Nano and have the CLK of the ...