Measuring new capabilities in a software project and comparing vs incremental...
Given two software projects X and Y relating to some Product A – Project X offers some new capabilities. Project Y offers incremental capabilities. Y’s features can be measured: we know its uses,...
View ArticleWhat is the technical description of 'sensitivity' in Lock-In amplifiers?
While I understand that the sensitivity in Lock In amplifiers should be as close as possible to the range within which the signal to be measured lies, I could not find a more technical description of...
View ArticleWhat does multiplying two real-world values represent? [duplicate]
This question already has an answer here: What do units like joule * seconds imply? 5 answers
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NTC error propagation: what I missing?
Reading through a Vishay datasheet of a NTC, I found the guide to devise the temperature error: I don’t understand why the errors of X and Y, for the non-approximated formula, were multiplied instead...
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distance measurement open circuit
I’m currently working on a project where a sliding metal box is mounted on a metal pole. The box moves up and down. At the top of the metal box is a small processing unit that needs to know the...
View ArticleWhy doesn't my NI DAQPad-6015 see the signal on sc-2345?
I want to measure the changes of current on the pressure indicator. For this purpose I use module SCC-CI20 in my sc-2345 connected to the computer with NI DAQPad-6015. In MAX all the devices are...
View Articlecrypto benchmarks STM32L4
Can someone give me an indication on the performance (time) of ECDH executed on the STM32F4 board. The STM32F4 has hardware acceleration for ECC...
View ArticleCan conductivity (or resistivity) value be assigned to 2D materials?
2D materials, such as graphene monolayer or graphene nanoribbon, don’t really have a cross section. By definition, conductivity is $sigma = frac{J}{E}$, and $J$, the current density, is calculated per...
View ArticleWhy doesn't my NI DAQPad-6015 see the signal on sc-2345?
I want to measure the changes of current on the pressure indicator. For this purpose I use module SCC-CI20 in my sc-2345 connected to the computer with NI DAQPad-6015. In MAX all the devices are...
View ArticleIrrational and rational lengths [on hold]
Quantum theory tells us that everything is quantized and so is every object. It provides for a smallest possible length and every possible length measured is an integer multiple of this length. If the...
View ArticleThe use of real numbers in measurements in physics?
When we measure something in physics we give a value plus or minus some uncertainty and assume that the measured value can take any value with the range with a certain confidence limit. I don’t...
View ArticleIs the Uncertainty Principle valid for information about the past?
My layman understanding of the Uncertainty Principle is that you can’t determine the both the position and momentum of a particle at the same point in time, because measuring one variable changes the...
View ArticleNon-linear scale of ammeter? [closed]
Recently some one asked me ‘Why ammeter (based on moving coil principle) has a non-linear scale?’ In multimeters (not based on moving coil principle) which we uses in digital lab, I didn’t found any...
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Getting the DC current in dV/dI circuit
I have a simple circuit: R1, R2 and R3 are actually one sample that has 4-terminals. The series resistor is to ensure current-driven mode. The voltmeter and Ammeter are actually Lock-In amplifiers...
View ArticleHow do you get from experimental measurements to models?
Many analytical models in the literature are “based on empirical measurements”. For example, for a radio propagation model, one would go out in the field, take his equipment and perform a lot of...
View ArticleHow can I compare two measurement technics of the population whose results...
I have a single population and applied two different techniques measuring the same molecule. One gives me concentrations and the other one gives luminosity. Is there a way to compare these two...
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Variable frequency AC power source
I’m looking for a variable AC power source for use in some electromagnetics experiments and longer term for testing inductors, transformers, core material frequency response, and that sort of thing....
View ArticleWhat is the relation between charge and polarization?
On one hand, in this “Measurement of polarisation” lab manual, polarization is surface charge density, $P=frac{Q}{A}$, in other words, charge an polarization are essentially the same thing. On the...
View ArticleIs there a tool to measure the chemical potential of a system?
Let’s suppose I put you inside a room filled with a gas. You can measure its pressure directly with a barometer. You can measure its temperature directly with a thermometer. Can you measure its...
View ArticleIdeal shape of a water clock
The ancients undoubtedly discovered the ideal shape of a water clock by trial and error. In examining some ancient water clocks I notice the shape is different depending on the size. For example, a...
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