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
609 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
213 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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647 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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1k views

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 ...
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1answer
97 views

ITS-90 Tempature coefficents for a standard PT100 385 RTD

I'm currently using the ITS-90 formula to convert a resistance of an RTD to a temperature. I got the coefficients from the manufacturers calibration sheet. The problem is I have another probe that I ...
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1answer
124 views

PT100 - 39250 Cubic fit formula

I'm currently using a cubic fit formula I found online to derive the temperature of a PT100/385 RTD using resistance. The formula is -247.29 + 2.3992*R + 0.00063962 *R^2 + 0.0000010241 *R^3 where R is ...
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1answer
478 views

Overshoots and ringing…Do I need to compensate my probes or is it bad line termination?

When working with my DSO (Rigol DS2072A) I recently observed that signals have overshoots and showed some ringing as in the image below (it's a 2 MHz digital signal, SPI from a µC). I use the 10:1 ...
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Heathkit IP-27 bench PSU min. stays at 0.18V and there is a +0.1V for all the readings?

I've recently acquired a Heathkit IP-27 bench power supply. The supply itself works quite fine except that the minimum voltage it can be turned down to with the coarse adjustment is only 0.18V, doesn'...
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2answers
1k views

STM32L4's Temperature Calculation Equation shows improper results

While using STM32L4's ADC to measure its internal temperature sensor data, I am facing an issue. The equation provided in STM32L4's reference manual, seems to showing improper results. The equation ...
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87 views

Mass Production Ultra-Low Current Calibration Methods

I'm attempting to design calibration for mass production on a newly designed product. The product is designed to use sub 1mA, so any digital calibration is unlikely. An example of this would be in ...
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1answer
51 views

Are Cal Kit (SOLT) definitions unique by serial number?

I have an E5071B Network Analyzer and 85033E cal kit. One of the standards is broken now and needs to be replaced. This is the Male OPEN standard (Part number 85033-60018). Question: Will the ...
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3answers
214 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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4answers
759 views

What is the recommended battery chemistry for digital multimeters?

I would like to know if the different internal resistances of different battery chemistry somehow affects the calibration of a digital multi-meter. If so, then what would the optimal battery ...
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3k views

How to avoid noise in YHDC SCT-013-000 current transformer?

I have a SCT-013-000 current transformer which I have connected to Arduino Uno with a burden resistor of 33 ohms and the calibration value I am using is 60. The problem is we are getting current ...
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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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1answer
349 views

How to calibrate the vertical sensitivity of an old analog scope (Hameg HM203-6)? [closed]

I have a Hameg HM203-6 20 MHz analog 'scope I bought from a flea shop. There's about 20% mismatch of the readings of the two channels, with CH1's vertical amplification being about 20% higher than CH2 ...
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2answers
511 views

Calibrating ADC for calibration-free temperature measurement

I have an application for a 10-year completely sealed battery-powered Bluetooth temperature measurement system providing an accuracy of +/-0.5C over a range of 0C to 50C. The device cannot be ...
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2answers
132 views

calibration working in DDR2/3 memory devices [closed]

Does anyone know exact working and what will be blocks present inside the calibration module of DDR2/3 memory devices? Any information related to calibration process of DDR2/3 SDRAM's is appreciated.....
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4answers
843 views

Calibrating a capacitive moisture sensor

I am doing a project which require to build a moisture sensor to measure wood chip moisture content. I built the the cylinder and put all the capacitor plate around it and I was able to measure the ...
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2answers
87 views

Calibrating DAQs

I'm using some of National Instruments' DAQs for some measurements, but their calibration is slightly off. To work around this I am hoping to factor in any imperfections into the measurements such ...
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2answers
561 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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1answer
148 views

How to calibrate multiple magnetometers for mass production

How would one go about calibrating several magnetometers in a production environment? The magnetometer is being used for the purposes of a compass. Currently I'm calibrating them one-by-one in an ...
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2answers
102 views

How can I calbrate my power meter?

I used to work for a company that made power meters but only worked on the desktop application (user interface) side of things and never really learned completely how some processes occur, like the ...
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3answers
215 views

Reference for color sensor [closed]

I am trying to make a colorimeter using TCS3200 sensor and white LED light source. After weeks of research and understanding on how different white light sources work and what are the algorithms ...
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1answer
291 views

Why is the calibration signal's amplitude of my oscilloscope 10 times higher than stated?

I'm trying to calibrate my HAMEG HM507 oscilloscope. The manual says that the calibration signal is 0.2Vpp. With the attentuation of the probe set to x10, volts/division set to 5mV/cm, time/division ...
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5answers
8k views

Need help calibrating ADC input using a voltage divider

I have been using Arduino Nano analog input to measure voltages, in the range between 22-30 Volts. The Nano's ADC expects a 0-5 volt range and has 0-1023 as its output. Following the instructions ...
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3answers
2k views

Standard Volt and Ampere

A recent question on here asking about how to calculate the accuracy of a circuit got me thinking about calibration in general. In particular, as EEs we routinely use volts and amperes as a unit and ...
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1answer
145 views

Different isolation when switching port calibration type

I have designed a directional coupler in ADS, and when simulating it in Momentum, I realized that depending the type of port calibration (checked on Calibration TML and Calibration None) the isolation ...
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1answer
289 views

How often should the CMPS11 be calibrated?

I have a project with arduino and the magnetometer CMPS11. I wanted to know how often the CMPS11 should be calibrated using this procedure: https://www.robot-electronics.co.uk/htm/cmps11i2c.htm
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332 views

Capacitor matching by capacitance multiplier

I am developing an analog fully differential circuit that needs a tight capacitor matching to reach high performances. Because discrete capacitors are difficult (and expensive) to match for production ...
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1answer
3k views

What is the maximum force that a FSR sensor can detect?

Force Sensitive Resistor (FSR) is a sensor which lowers its resistance when there is force upon it. If there is no force acting on it, the resistance is ~10MOhms. In the datasheet of FSR A401 of ...
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2k views

How calibrate an RGB LED to get correct color mixing [closed]

We are using RGB LEDs in our product and we require to emit white light to indicate a certain state. But because of the tolerance of the resistors and the LED itself it is hard to achieve the same ...
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1answer
207 views

Problem with calibrating a PT100

I am trying to do a 12 point calibration of a 4 wire 1/10 DIN PT100 using a Fluke dry well and controller. [Accuracy of the Fluke measurement is +/-5mK] I put a 100.000 Ohm calibration resistor on ...
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1answer
365 views

Calibrating an AD592 temperature transducer

This transducer outputs 1uA/K. To convert it to a voltage I've put it in series with a 1k 5% resistor and a 220R trimmer to adjust for the 5% variance, tested with the multimeter to make sure I'm ...
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1answer
952 views

How is a modern digital oscilloscope calibrated?

Old CRT type oscilloscopes were nothing but analog devices. They were filled with potentiometers. All this circuitry would drift over time. When they were calibrated, known waveforms were fed to the ...
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1answer
1k views

Calibration of magnetometer for precise yaw

I'm using Sparkfun Razor IMU 9DOF sensor which incorporates accelerometer, gyroscope, and magnetometer, for giving the Euler's angles (yaw, pitch, and roll). I'm using the firmware at this link. It ...
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0answers
232 views

Accelerometer - Offset correction

I'm using the MMA8453Q for motion detection. The accelerometer is mounted such a way that when it is stationary, X & Y axes are at 0g & Z-axis is at 1g. My usecase is: A tilt across any axes ...
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4answers
2k views

How is the degaussing feature in the HMC5883L 3-Axis Digital Compass chip correctly used?

edit/tl;dr: The set/reset strap driver is an H-bridge circuit to deliver 10 mA of DC current to a strap which temporarily produces about a 1.1 gauss magnetic field offset. A change in the measurement ...
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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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3answers
124 views

Is each individual CPU calibrated before being shipped?

The quartz movement in battery-powered watches is plated with gold and trimmed individually using laser to achieve a vibration frequency of exactly 32,768 Hz to keep time accurately. The crankshaft ...
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1answer
148 views

A homemade programable voltage calibrator

I made a DC measurement board based on ADC and ARM. Now I want to add 'self-calibration in filed' function to it. I think I need a voltage reference and a voltage divider. And I don't want to ...
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4answers
6k views

What is VAR knob used for and why should it be usually in CAL position in analog scopes?

I'm trying to understand the VAR CAL uses in analog scopes. Almost all the texts I read mention briefly about these and do not explain well. Here are some examples: CAUTION! There is usually a ...
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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
46 views

Calibrate AC measuring channel using DC input

I've made a AC voltage measurement board, the structure is simply: input -> gain -> block capacitor - ADC. Now I want to calibrate it. Because the input may be sub mVs, so I'm considering calibrate ...
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1answer
79 views

Temperature calibration for of the shelf sensor nodes

Terminology: sensor node sensor I have been experimenting with of the shelf temperature sensor nodes. The exact device in question is an Aeon Labs LLC, Aeontec Z-Wave MultiSensor 6. I got the ...
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3answers
80 views

auto-recalibration of a power supply through something stable over time? (thought experiment) [closed]

Highly accurate instruments with a calibration are quite expensive, and anything electronic will tend to change over time. The effects of heat and oxidation, and perhaps changes in the material due ...
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2answers
5k views

How to calibrate the MLX90616 IR temperature sensor?

I have purchased some Melexis mlx90616 IR temperature sensors. The data sheet states that a calibration “by the customer” is required. By contacting my purchaser I got the answer: "The supplier has ...
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2answers
6k views

Vref_cal on STM32F3xx ADC

Is there a function to read the Vrefint_cal in Cubes HAL libraries? I'm using the F3xx. I'd like to measure the supply voltage of the micro. The formula given in the reference manual is: \$ \Large ...
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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
1k views

How can I calibrate my sound card based oscilloscope?

I'm using Soundcard Oscilloscope software that presents as below You'll notice that the display has a grid, and in the example is set for 100mV/div. Since it's using the sound card integral to my ...