Questions tagged [accuracy]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
2 answers
36 views

Output resolution of PWM H bridge drivers such as L298N

I am working on a project which require a high resolution of the output signal of L298N or similar driver. Is it possible to control the output signal with a 1% resolution or better? What is the ...
user avatar
  • 3
0 votes
1 answer
58 views

Acceptable overshoot, accuracy, and control bandwidth of a buck converter

I am designing a closed loop buck converter and was wondering what would be the acceptable values/performance for control parameters like accuracy, control bandwidth, and overshoot. I know that the ...
user avatar
  • 67
0 votes
4 answers
137 views

Measure capacitors in parallel and series to increase precision?

I measure a capacitor \$C_1\$ with an instrument that has a tolerance of measurement \$\pm 5\%.\$ I do the same with another cap \$C_2\$. Then I put \$C_1\$ and \$C_2\$ in parallel (values add up) and ...
user avatar
4 votes
1 answer
177 views

Is AC current clamp meter accuracy affected by the inner wire curving around the outside?

I have a SCT013-030 current clamp sensor I plan to use to read out the power usage of a mains AC load. It works by wrapping around one of the AC strands of wire to measure the magnetic field. The one ...
user avatar
1 vote
1 answer
186 views

Why STM32 is more popular at industrial devices? [closed]

Well, I am really new started engineer to embedded system. Generally I am using Arduino NANO and its look very easy to use, low power consumtions and lots of library and etc is benefitial for me. But ...
user avatar
  • 873
1 vote
1 answer
75 views

How do I calculate accuracy marked as ±(4 ppm rdg + 10Digit)?

Trying to figure out the correct way to calculate accuracy with LSD. I looked at a few sources, but I'm still confused on the topic. The question: A digital voltmeter can display counts up to 1999999 ...
user avatar
0 votes
2 answers
183 views

Accuracy of analog multimeters

What accuracy should I expect from an analog multimeter that cost 50$ when measuring resistance? It's measuring 1.5 kilohm correctly, when measuring a 10 ohm resistor it's about 30% off. I tested it ...
user avatar
  • 113
-3 votes
1 answer
59 views

Find the range of uncertainty? [duplicate]

The problem says that an ammeter has a 30 mA upper measurement limit and its accuracy class is 2%. For the relative measurement error when measuring 22 mA, I found it is2,7%. I used the formula h(%) = ...
user avatar
0 votes
1 answer
69 views

What does it mean by "in the range of 1000:1" for an accuracy of 0.2 in energy metering?

Most of the time whenever I come across electricity metering or CTs, there is always a term like an accuracy class e.g. 0.2, 0.5, 1, 2, etc. I have an idea about what this accuracy class means. But ...
user avatar
0 votes
2 answers
79 views

How to calculate accuracy of LDO

I will be using a TPS7H1101A LDO and wanted to calculate the accuracy of it. I see in the datasheet they list the output voltage accuracy of +/- 2%. I think this number in some datasheets covers the ...
user avatar
  • 111
4 votes
3 answers
520 views

How can I improve the accuracy of my voltage divider?

I am designing low-cost SoC (State of Charge) evaluation software for a LiFePo4 battery cell at zero current (actually only a low current due to auto discharge). For this peculiar application, low ...
user avatar
0 votes
1 answer
164 views

Does using two Hall effect current sensors in parallel affect accuracy?

I am designing a circuit with allegro current sensor ACS770 for measuring currents up to +/- 90A. I have 2 options : use single ACS770-100B (100A Bidirectional version) use dual ACS770-50B in ...
user avatar
  • 179
0 votes
2 answers
88 views

SAR ADC dynamic range and accuracy

This App Note states: To have the maximum ADC conversion precision, it is preferable that the ADC dynamic range matches the maximum amplitude of the signal. Assume that the signal to be converted ...
user avatar
-2 votes
1 answer
73 views

Difference between simulator and my analysis

I have this circuit: I have done circuit analysis and found the total current to be 21mA. Here is what I have done: But when I run the same circuit in multisim it shows me 20.6mA.What could it be?Am ...
user avatar
1 vote
2 answers
428 views

How more accurate in practice will a STM32 become if we use HSE?

Everybody talking about that HSE (External crystall) is much better than internal RC-oscillator in a STM32 microcontroller. But how much better is it and how? Is the ADC more accurate? Are the timers ...
user avatar
  • 769
1 vote
0 answers
68 views

9-axis IMU for weighing on a boat with varying sea conditions

I am brainstorming on how to do relatively accurate weighing scale for fish on a boat under different seastate conditions. I know other companies use a second load cell together with calibration data ...
user avatar
0 votes
2 answers
145 views

How to improve the accuracy of measured ADC voltage in a circuit connected to Vcc

The question is based on the following setup. As depicted there is an IC to measure the real value of the 3.3V supply voltage accurately. The measured value of the 3.3V source is transferred via SPI ...
user avatar
  • 131
-1 votes
1 answer
180 views

Is measurement uncertainty 2 times standard deviation or 2 times standard error?

Textbooks and online sources often say the industry standard for uncertainty is given at a confidence interval of 95 %. This means out of 100 measurements, 95 would achieve the specified value and ...
user avatar
2 votes
1 answer
468 views

Accuracy of manufactured photocells (LDR) with respect to light intensity

I was looking through photocell (photoresistors) datasheets, like for instance the NORPS-12, especially the graphic on resistance value versus light intensity. In no datasheet could I find information ...
user avatar
  • 21
2 votes
1 answer
156 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 ...
user avatar
0 votes
2 answers
1k views

How many bits of information does a voltage of 0-5V , with accuracy of ±50mV convey?

In my intro to logical design class, we were shown this simple question as one of the first examples for the exercises we will have. The question was: An analog voltage is in the range of 0–5 V. If it ...
user avatar
0 votes
0 answers
123 views

What is the true accuracy of a linear regulator or DC/DC converter design?

Normally, vendors of LDOs and DC/DC converters specify the output voltage error in the range of 1.5% to 2.5%. However, the analysis often suggests that the error can range from 3% to 6%. Lately, I saw ...
user avatar
  • 369
2 votes
0 answers
43 views

Accurate localization through GPS, IMU and odometry

I am trying to localize a robot with an error <1m. I have XA1110 GPS but haven't tested it in an open area (due to the ongoing disaster) hence I am unaware of its practically achievable accuracy. I ...
user avatar
2 votes
0 answers
58 views

How to solve ADC measurement issue?

For a project, I am using the following circuit to detect the load3 change. With an 16-bit coulomb counter ADC I am measuring the current I. Using onboard Arduino Uno ADC I am measuring votage, V at ...
user avatar
  • 111
0 votes
3 answers
310 views

ADC resolution vs Accuracy of signal measurement?

I want to get accuracy of 0.1% in the following analog signal measurement: AC voltage in the range of 0-300V (0.1% = 300 mV) Then what is the minimum no of bits or resolution of ADC that I can use? My ...
user avatar
  • 139
1 vote
2 answers
122 views

Fluctuating ADC results - is it normal and characterized in a datasheet?

As I have been reading [1], there exist four different DAC error types, which contribute to the overall error: Offset Error Gain Error INL Error DNL Error Is my understanding correct, that these are ...
user avatar
  • 125
0 votes
0 answers
63 views

high accuracy analog differential signal switching solutions to prevent distortion (relays?)

first let me define the application and circuit. the application of this is to sence currents ranging from 1nA to around 900mA. to accomplish this two resistors are used, a 10K for the nA range, and a ...
user avatar
0 votes
2 answers
117 views

Poor man's voltage reference

I want to build a voltage reference based on LM4040 (A series 0.1%), the output voltage is switchable with a selector switch: simulate this circuit – Schematic created using CircuitLab ...
user avatar
  • 1,974
2 votes
1 answer
58 views

Use of ADC Bits below noise floor

I have a Sigma Delta Modulator with a SINC3 Filter. The System runs at maximum oversampling possible for this application and I know my (Full Scale Signal)ENOB for this szenario to be 14. Is there ...
user avatar
0 votes
0 answers
47 views

Why is there a discrepancy in the E192 series? [duplicate]

For all series from E48 through E192, this holds true: $$ value = 10^{\frac i n} $$ where i is the zero-based index in the series and n is the length of the series. The one exception is E192[185]: $...
user avatar
  • 2,997
4 votes
4 answers
423 views

Confused with the effect number of decimals at the output of transducer

There is an ultrasonic device which measures and outputs both wind speed and direction and has a very long manual. But to keep it short and summarize, the accuracy and the resolution for the wind ...
user avatar
  • 380
0 votes
1 answer
44 views

How to relate the sampling frequency to the measurement error for this kind of pulse period measurements?

I sample a zero to 400Hz varying pulse train at 4kHz and post-process this pulse train data by MATLAB to obtain each single pulse's period. So for instance below represents a 0 to 6V pulse. The green ...
user avatar
  • 1,097
11 votes
5 answers
4k views

Why would a part be available as 4.99k and 5k?

I was looking at chip resistors, and came across the MORNTA1001AT5, which comes in many resistance values. The resistor tolerance is 0.1%, so what is the logic of having the part available in both 4....
user avatar
  • 3,032
0 votes
3 answers
201 views

measurement errors: add up or cancel out?

Take an accelerometer, or a hall sensor, or a thermometer, or any sensor. It will have an accuracy, which means the readings will contain some error of this sort. My guess is that by taking a big ...
user avatar
  • 798
1 vote
1 answer
163 views

Calculate measurement accuracy of voltage divider with suppressor diode?

I have a voltage divider to measure the voltage in a DC Bus. I parallel to R1 I have a suppressor diode (D1) to protect the input of the microcontroller from transient overvoltages. This diode has a ...
user avatar
  • 159
0 votes
1 answer
111 views

DC motor accuracy with encoder

I am building a coil winding machine and I've already set up something that works. I used two nema17 stepper motors and tb6600 stepper driver cards. The problem is that motors are seems to overheating ...
user avatar
1 vote
1 answer
396 views

Set the Gain of an Opamp Accurately Using a Potentiometer

I want to set the gain of an opamp accurately using an potentiometer, with low thermal drift and good long-term stability. From what I've read, there are three basic ways of doing it, but none of them ...
user avatar
  • 3,857
0 votes
0 answers
492 views

PPS Timer on STM32

The MCU used is a STM32F042 which is clocked by an OCXO oscillator (Abracon 10 MHz - 20 ppb). The subject of this thread is to get the best accuracy on one PPS Timer. For my application, I need to ...
user avatar
  • 159
0 votes
3 answers
165 views

GPS relative positioning

I have a set of 4 rovers crawling on the ground, each of them equipped with a standard GPS positioning system. The rovers start together from a known position. Each rover is locating itself via GPS. ...
user avatar
6 votes
1 answer
2k views

Why is my 10k NTC thermistor on average accurate to 2C

I am trying to figure out what is causing the 2C inaccuracy in my thermistor calibrations, my goal is to get my accuracy down to > .1C. I am using the KS103J2 10K NTC thermistor. To calibrate my ...
user avatar
1 vote
1 answer
141 views

Finding out the accuracy of the current probe's measurement

As part of power supply testing we are measuring the current profiles of various regulators. Startup profiles includes current bursts with different current amplitudes and widths. i want to ...
user avatar
  • 1,318
2 votes
2 answers
166 views

Question about the accuracy of integrated resistors

I'm studying the implementation of resistors in integrated technology. In particular the books deals with the accuracy of the obtained resistors. It says: Then it says: "We observe that the value of ...
user avatar
  • 596
0 votes
1 answer
461 views

Load cell accuracy: rated output vs. full scale

I'm currently shopping for some subminature load cells for a research project. I've narrowed it down to two options, the FUTEK LCM100 and the Burster Model 8417. Problem is the two specify their ...
user avatar
1 vote
1 answer
1k views

Measure sensitivity of ADC

I would like to benchmark my ADC. I can calculate a sensitivity value based on the information in the datasheet. However, I would like to measure/benchmark this figure. Is there a standard method ...
user avatar
  • 13
9 votes
6 answers
2k views

Would reducing the reference voltage of an ADC have any effect on accuracy?

Regarding the following information taken from a paper: The paragraph is telling about what happens when the ADC Vref is reduced. There is the statement from the above quote: Note that if you ...
user avatar
  • 3,340
6 votes
2 answers
1k views

Precision notation for voltmeters

From the technical details of a multimeter: AC Voltage: - Range and Accuracy: 200mV ± (1.0%+2); 2V ± (0.7%+3); 20 ± (1.0%+3); 200/600V ± (1.2%+3) What does the notation "± (0.7%+3)" mean? ...
user avatar
  • 161
0 votes
1 answer
69 views

Resistance measurement and standard uncertainty

In a text there is a section regarding a basic example for uncertainty calculation of a resistor. Here is the related part: Above the text uses the the accuracy of the current source and the ...
user avatar
  • 1,335
0 votes
2 answers
644 views

How accurate are flex sensors?

So for the project I am working on I plan on measuring very precise changes in angle, possibly up to 5 degrees of accuracy. Are polymer ink sensors (the classic Nintendo power glove flex sensor) the ...
user avatar
1 vote
2 answers
126 views

Problem understanding impedance measurement device accuracy format

I am reading the datasheet of an impedance measurement device. Its accuracy is listed as '±0.4% rdg. ±8 dgt.'. What does 'rdg.' and 'dgt.' mean? And how should I interpret the accuracy? The device is ...
user avatar
1 vote
1 answer
448 views

How can I make my measurements of full-wave rectified AC using an A/D match a Fluke meter on its DC range?

I am trying to measure the DC voltage of a full-wave rectified 60Hz AC signal using an A/D and have it match what a Fluke meter reads on its DC scale. My current approach is to take as many (16 bit) ...
user avatar