Questions tagged [uncertainty]

non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used

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When calculating the energy delivered by a pulse in an oscilloscope, what is the uncertainty in the timestep increment? [duplicate]

I am trying to calculate the energy delivered by a short electrical pulse. I am using an oscilloscope to capture the waveform and then exporting it to a CSV file. My scope took measurements at a rate ...
1 vote
1 answer
53 views

When calculating energy from a pulse measured with an oscilloscope, will the timestep always contribute a relative uncertainty of 1/2?

I am trying to calculate the energy delivered by a short electrical pulse. I am using an oscilloscope to capture the waveform and then exporting it to a CSV file. My scope took measurements at a rate ...
4 votes
1 answer
64 views

Combine uncertainty of multiple measurement instruments

I'm currently working on a project where I'm trying to figure out if there exists a significant difference between measurement instruments for RF power measurements. I will measure multiple Bluetooth ...
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1 answer
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Calibrating the current (uA) of a TI by using a 34465A DMM as a std and a suitable load

When calibrating a test instrument (TI) on its current generation using the DMM 34465A as the standard and a suitable load in series, I think the uncertainty budget should not include the accuracy and ...
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1 answer
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Uncertainty of output current in voltage-current converter

I have a problem comprehending some things about uncertainty in electrical measurements. Here is illustrative example from my textbook. We use voltage-current converter for measurement. simulate this ...
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-3 votes
1 answer
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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(%) = ...
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Am I reading the multimeter uncertainty correctly? [duplicate]

I am using a multimeter that has an uncertainty (from the manual) of 0.5% plus 5 digits in DC voltage measurements, 4V range. I have a reading of 1.6172 V. That means an uncertainty of 0.508 V. Isn't ...
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34 views

Mismatch uncertainty of S11 antenna measurement with adapter

A horn antenna needs to be measured for its S11 parameters, but it requires an adapter from a rectangular waveguide to a square waveguide. VNA calibration is performed at the end of the rectangular ...
1 vote
1 answer
149 views

How do I determine the actual measurement when the multimeter readings fluctuate?

The specifications of the multi meter state +/- 0.8% + 2. I will take that into consideration when I calculate the tolerance. But when I was recording values from the multimeter, I saw fluctuating ...
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1 answer
153 views

How do I find the accuracy / uncertainty of my force sensor system?

I have built a force sensor using an arduino and a self built force sensitive resistor (FSR.) The sensor system consists of a simple voltage divider, where the voltage across the FSR is measured by an ...
-1 votes
2 answers
115 views

What is the uncertainty of the Analog Discovery oscilloscope?

I'm an electrical engineering student and I have to measure the Slew Rate of an opamp (and most importantly its uncertainty). I created a simple voltage follower circuit and I'm using the Analog ...
-1 votes
1 answer
270 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 ...
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How are equations (transfer functions) and the uncertainties for sensors found?

Does anyone have a good: book / link / resource which describes from the ground up how to find an equation / transfer function and the accompanying uncertainties for sensors? I am looking for ...
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1 answer
67 views

How many standard deviations is Sensor / Component Uncertainty (+/- X) given in?

For example a resistor of 1kohm with uncertainty of +/- 1%, does this mean in 68% of cases = 1 standard deviation, the resistance will vary by +/- 1%, or does it mean in 95% of cases = 2 standard ...
0 votes
1 answer
575 views

What is 1.5%rdg + 4dgt for 15,23 V?

Where "Rdg"is for reading and "dgt"is for digits. So, 15,23 * 0,015 = 0,22845. Rounding to most significant digit it's 0,2. So is this correct? $$15,23 \pm 0,2$$ Since 4dgt is smaller we ignore it. ...
1 vote
2 answers
152 views

Calculating uncertainty in a current divisor

I had the following exercise to do for college: I designed an analog ammeter exactly like this: simulate this circuit – Schematic created using CircuitLab The idea is to design an ammeter ...
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62 views

Is the quantization error and random error included in the of-range error for multimeters?

When I am looking at a datasheet for a DMM (Digital Multimeter) to calculate the accuracy of a measurement it specifies two error sources: of-range and of-value (also called of-reading). For example ...
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