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.

Filter by
Sorted by
Tagged with
0
votes
0answers
37 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. ...
0
votes
1answer
23 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 ...
0
votes
1answer
30 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 ...
1
vote
2answers
53 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 ...
2
votes
2answers
105 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 ...
0
votes
0answers
19 views

ATM90E32 Energy representation and calibration

Thanks to this forum I just understand how this ATM90E32 represents the energy data as [ CF ] but now I have a more kind of complex issue... Now the energy registered by the ATM90E32 is not similar ...
10
votes
4answers
2k 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 ...
1
vote
1answer
55 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 ...
0
votes
0answers
33 views

Why does CCP require CRO/CRM messages to be 8 bytes?

In the CCP (CAN Calibration Protocol) V2.1 standard it is stated that CRO and CRM message objects must have a DLC of 8 even if they aren't used. What is the purpose for requiring these message objects ...
0
votes
1answer
60 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 ...
0
votes
1answer
92 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?
0
votes
0answers
104 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 ...
1
vote
0answers
394 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 ...
0
votes
1answer
54 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 ...
0
votes
1answer
66 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 ...
2
votes
1answer
251 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 ...
0
votes
0answers
29 views

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'...
0
votes
2answers
403 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 ...
1
vote
0answers
72 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 ...
1
vote
1answer
44 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 ...
0
votes
3answers
116 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 ...
0
votes
4answers
231 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 ...
0
votes
0answers
2k 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 ...
3
votes
4answers
975 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 ...
0
votes
1answer
254 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 ...
3
votes
2answers
357 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 ...
1
vote
2answers
114 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.....
1
vote
4answers
754 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 ...
2
votes
2answers
83 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 ...
0
votes
1answer
378 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 ...
8
votes
1answer
108 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 ...
0
votes
2answers
95 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 ...
0
votes
3answers
190 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 ...
1
vote
1answer
223 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 ...
0
votes
5answers
5k 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 ...
14
votes
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 ...
1
vote
1answer
113 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 ...
1
vote
1answer
267 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
0
votes
0answers
308 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 ...
0
votes
1answer
2k 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 ...
1
vote
0answers
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 ...
0
votes
1answer
193 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 ...
0
votes
1answer
306 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 ...
0
votes
1answer
858 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 ...
3
votes
1answer
929 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 ...
1
vote
0answers
229 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 ...
5
votes
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 ...
6
votes
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 ...
0
votes
3answers
105 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 ...
0
votes
1answer
95 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 ...