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Results tagged with measurement
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user 50733
Measurement is the assignment of numbers to objects or events. All measurements consist of three parts: magnitude, dimensions (units) and uncertainty.
16
votes
Measuring small movements of a needle and syringe
I suspect a student struggling to control the position of a small syringe would be distracted by a large measurement arm, no matter how well balanced and low friction. …
- 174k
11
votes
Why are oscilloscope input impedances so low?
A lot of things are the way they are because of history, and de facto standardisation.
A general purpose oscilloscope input is a difficult compromise between not loading the circuit, not being damaged …
- 174k
10
votes
Accepted
How is a 50Ω "back-termination" accomplished on a scope probe line?
When probing high frequency signals, the standard way to allow an arbitrary length of cable between the device under test (DUT) and the scope, is to make the scope 50\$\Omega\$ input impedance, and us …
- 174k
10
votes
For measuring a resistance should you use a constant current source or a voltage source?
If you need to measure 0.2 Ω, then 4-wire is your only practical solution. This means a current source passing a current through the device under test, and a voltmeter measuring the voltage across it. …
- 174k
9
votes
Accepted
How to measure three resistors in a triangle
It is possible to make the measurement in a single cycle. … b) All three leads to the 'resistor delta' will have some finite resistance, which will cause measurement errors. …
- 174k
8
votes
Resistor wattage measurement
You cannot measure the wattage of a resistor with a meter. It is a function of its mechanical properties alone, how much heat it can dissipate, what temperature it must stay below.
Until you have som …
- 174k
7
votes
How to measure voltage of a system with a different GND reference?
If the common mode voltage is too high or uncontrolled to do these measurements, then my favourite way of doing a cheap and cheerful isolated voltage measurement is to use a voltage controlled VCO, perhaps …
- 174k
7
votes
Accepted
How to measure EMI without special equipment?
Without locking to the spread spectrum code to reduce the effective measurement bandwidth, the signal level is waaay below the ambient thermal noise. … This will enable you to get a qualitative measurement of whether it is indeed the dashcam, and then how well anything you do to it works. …
- 174k
7
votes
Measuring nA leakage current
My issue is my meter's measurement accuracy is only around 10uA,
Maybe on your lowest current range perhaps. Have you looked carefully at what your lowest voltage range will do? …
- 174k
6
votes
Accepted
Why is this the maximum dynamic range in a spectrum analyzer?
Signal to noise ratio gets worse as signal level falls.
Signal to distortion ratio get worse as signal level rises.
Dynamic range is the ratio of the signal level to any unwanted signal, noise or di …
- 174k
6
votes
How to make an accurate strain gauge conditioner
A better way is to make the measurement leg from two strain gauges, one unstressed as a resistor. Tempcos will now match in both measurement and reference legs. …
- 174k
6
votes
Getting the energy consumption in joules over a period when having current and voltage
How you do it should depend on why you think the readings are varying.
If you think they vary because of reading errors and noise while the device takes a constant current and is fed with a constant v …
- 174k
5
votes
What is the noise level as read on my oscilloscope?
As you say, peak is not well defined for noise. That's why an opamp, anything really that defines noise, measures it as RMS.
Look up Normal distribution, wikipedia for instance. When people want to k …
- 174k
4
votes
Accepted
Variable frequency AC power source
Look around for audio amplifiers in the 2kw / 3kw power region. I think you'll be surprised at the low price (I was).
What is advertised as a 3kW amplifier is usually a 1500w stereo into 4ohm loads t …
- 174k
4
votes
Accepted
Understanding "dBc" in the context of IM3
This means that instead of taking a single measurement, you should take a measurement at a range of power levels, and plot the IPs against the main tone power. …
- 174k