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
40 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 ...
6
votes
4answers
737 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
42 views

Calibrating a PT100 - 2 point and 5 point

I have to buy some 1/10 DIN PT100 sensors. I can get them calibrated with either a 5 point calibration or 2 point calibration for the Callendar van-Dusen coefficients. Big price difference. Range is ...
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0answers
60 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
29 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
41 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
71 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
126 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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1answer
84 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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0answers
22 views

Calibration standard for VNA L0, L1, L2, L3 values TRL, LRL

I am designing a TRL calibrations standard and would like to know how to find L0, L1, L2, L3 values at higher frequencies. Any suggestions!
0
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1answer
65 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
76 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 ...
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1answer
78 views

Unwrapping measurements from Adxl345 accelerometer

I am trying to read acceleration values from a ADXL345 via I2C. I've successfully configured the accelerometer with a resolution of 16G. Test 1: 180° rotation along the y axis in 16G resolution. The ...
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1answer
58 views

Calibrating a multimeter without another multimeter

I have a hand-me-down multimeter from my Mom made in the 80s. I don't have another meter that is good enough to be used as a calibration standard, however I do have a few reference chips and precision ...
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1answer
54 views

Circular force sensor: some basic questions about its functionality

Sorry if my question sounds to simple for this forum. I just wanted to confirm the default measure of the output of circular force sensor when it is connected to the breadboard (with resistor)? Does ...
0
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1answer
105 views

Is my K-type thermocouple defective, or am I using it wrong?

I have two K-type thermocouples that look exactly like the one below. One was sold as good to 800C, and the other was quoted as having a temperature range from 0-400C. I have been swapping them ...
7
votes
2answers
230 views

Best way to calibrate ADC for current sense MOSFET

I'm using the infinion BTS6143 as a current switch and current measurement device in combination with an STM32 controller. The BTS6143 is an integrated MOSFET with internal charge pump and \$I_{sense}...
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5answers
140 views

Calibrate without a known good voltage source

I'm traveling and don't have a known exact voltage source. I do have a variety of electronic components such as resistors of various flavors and am wondering if there is some kind of trick to getting ...
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1answer
46 views

What means linear response for accelerometers?

What means that accelerometers measures linear acceleration and, in particular, that they are a linear response?
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2answers
54 views

Micro-Voltage Reference

I need a micro-Voltage reference to calibrate my micro-Volt amplifier. The ICs only go down to 200mV, fixed. So how should I go about this? Use the lowest I could find, then use a Voltage Divider to ...
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1answer
42 views

whats the right kind of reference to calibrate a measurement instrument?

I have been working in a calibration system for a multimeter I'm developing To do this i'm calibrating the reading values using Fluke meters (bassically my instrument has to match the fluke ones) ...
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0answers
155 views

Accelerometer calibration using Gauss Newton Method

I got an ADXL 337 from Sparkfun and My sensor works as follows ...
0
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3answers
112 views

Can calibration improve the accuracy of a circuit?

If I have some resistors and a fixed-gain current shunt amp, that all claim "1%" accuracy can I make a system that's better than 1% accurate, if I put a calibration tuning pot into it, and adjust it ...
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2answers
116 views

can I place 250ma fuse instead of 200ma fuse in multimeter, affacts meter calibration? [closed]

Well I know that it fuse will pass more 50ma in my multimeter but I want to know that will it make some change in my calibration of multimeter? can more 50ma current can damage my meter?
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2answers
62 views

How to Generate a Calibration Signal?

I'd like to generate an integrated calibration signal for a biopotential amplifier. I'd like to generate a 0.5mV square wave (within 5%) at 200Hz (give or take on the frequency). I'm thinking of ...
0
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1answer
176 views

Load Cell Data Problem - INA125P + Arduino Uno

I am currently reading data from my 30kg load cell with my Arduino UNO board and passing this data to my PC. I am using INA125P to amplify the voltage of my load cell and it is established on a bread ...
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1answer
202 views

Legal requirement for measurement equipment calibration in manufacturing

We have a build approaching but one of our PSU's used in the function tester will be out of calibration in 3 weeks. Most likely we will complete the build whilst the PSU is still within it's ...
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2answers
86 views

VCTCXO control voltage circuit recommendations?

I'm building a frequency calibration rig. Right now, I've got a fixed TCXO and it has an uncalibrated drift versus GPS of around 0.185 ppm ±50 ppb. I'm prepared to simply subtract 0.2 ppm from the ...
0
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1answer
153 views

Characterizing a capacitive touchscreen

Is it possible to measure a meaningful impulse response of a capacitive touchscreen such as the one you might find on a mobile device, with the goal of "calibrating" devices with different ...
0
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1answer
494 views

black level calibration in image sensor

For one camera, the black level of the sensor will make the output non-zero when it is covered. For example the output of the sensor is 10bit and black level is 63, if the output is reduced by black ...
0
votes
1answer
125 views

Analogue oscilloscope probe selection

Recently, I have bought an oscilloscope with model Panasonic VP-5512A Panasonic VP-5512A 100 MHz 2CH+1/2+1/2 Dual Timebase It is an analog oscilloscope. ...
0
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1answer
199 views

How is an accelerometer initially calibrated?

Referring to a MEMS accelerometer, how is the laboratory, initial calibration being carried out? Is the gravitational acceleration involved as a reference, or is the actual analog data being ...
0
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1answer
596 views

how to calibrate ADXL345 accelerometer?

I have ADXL345 digital accelerometer by Analog Devices. I use Beaglebone ADXL345 library that exist here: http://inspire.logicsupply.com/2014/08/beaglebone-3-axis-accelerometer.html So I can read the ...
3
votes
2answers
145 views

How can you auto-calibrate a conductance sensor?

Sensors need to be calibrated every so often, so that the voltage/current change due to the change in the conductance is always the same, and the signal conditioning of that voltage/current is always ...
0
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1answer
164 views

Temperature calibration for MCP9808 [closed]

Reading a lot, I have found nothing about calibration for the MCP9808. I have read the datasheet and understand that the chip converts the temperature to Celsius. The given accuracy in the datsheet is ...
17
votes
6answers
10k 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. ...
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1answer
4k views

How does a smart phone measure the battery power?

A smartphone (assume Android) usually displays the battery percentage from 0 to 100%. I am assuming this is the usable power capacity of the battery. I have several questions: 1) How exactly does it ...
0
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1answer
147 views

Calibrating buck LED driver by altering Vsens

Many switch mode buck LED drivers use a current mode scheme with a sense resistor back to a Vsens or Current Sense input on the chip. A good example is the LM3404. Here's the typical use circuit: I ...
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vote
1answer
98 views

LabVIEW Calibration Routine

I have a hardware setup where I am trying to null the input offset voltage of an op-amp using an I2C digital potentiometer. The op-amp inputs are shorted and I am measuring the output using an NI Data ...
2
votes
0answers
139 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated charge....
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2answers
293 views

Using a trimmer pot to output a percentage of voltage

I am trying to do a project where I am getting two (or more) voltages and averaging them all out. Then I would like to use a trimmer pot to adjust the voltage by a percentage, basically as a fine-...
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3answers
107 views

Calibrating the output voltage

I have a device which has a 16 bit D/A converter which through an analog linear circuit generates an output voltage between -1V and 1V. I have 32 of such channels on my device. simulate this ...
3
votes
0answers
726 views

How to calibrate a Kill A Watt meter and understand its hidden service menu [closed]

I found a hidden menu within the Kill A Watt P4400 meter, which is accessed by holding down the Volt and Hz buttons. Although I rendered my meter unable to measure accurately because of my futzing ...
2
votes
2answers
251 views

Calibration and trapping the CPU

The following code is meant for MSP430. Can somebody help me what is the purpose of trapping the CPU? How will the program proceed if the CPU is trapped there? ...
3
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2answers
2k views

Temperature compensation of LSM303DLHC accelerometer / magnetometer

ST Microelectronics makes the LSM303XXXX, a popular range of 3-axis accelerometer / magnetometer sensors that are used on Arduino breakout boards, etc. The older LSM303DLH sensor has been replaced ...
4
votes
1answer
407 views

How to calibrate an optical particle sensor (Mie scattering)

I have a very simple sensor that basically emits infrared light (1 micron wavelength in the infrared range). The light scatters off particles whose diameter is of the same order of magnitude as the ...
7
votes
2answers
597 views

Where can I send my 0.005% 1 PPM tempco calibration resistors to find out their “true” value?

edit: putting this at the top because people keep answering questions I didn't ask: Where can I get this done cheaply by a place that is hobbyist friendly? I don't even know where to look. I imagine ...
2
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1answer
561 views

PIC18F26K80 ADC calibration using Bandgap

The PIC18F26K80 errata sheet mentions that the ADC has an offset error as high as 25 bits and discusses one workaround copied from the errata here: A/D Offset The A/D may have high offset error, up ...
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3answers
257 views

Does calibration involve fixing electronics or mechanical part?

My question is not 100% related to electronics design but it might be because I don't know the answer. I'm writing a simple research on anemometer calibration. The thing is all the resources I found ...
6
votes
1answer
117 views

Torque measurement device calibration

I don't know if I'm at the right place to ask this question but here is my trouble : I'm trying to find a good way of calibrating a electronic device used to measure small torques (0 -> 25 mNm). ...