# 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
91 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 ...
109 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 ...
17 views

### 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 ...
• 1
118 views

### 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 ...
• 101
69 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(%) = ...
45 views

### 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 ...
• 1,195
1 vote
182 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 ...
276 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 ...
140 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 ...
373 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 ...
170 views

### 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 ...
78 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 ...
1k 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