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Questions tagged [measurement]

Measurement is the assignment of numbers to objects or events. All measurements consist of three parts: magnitude, dimensions (units) and uncertainty.

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is it possible to install some device which will measure in real time the torque my diesel engine is providing at the moment?

It is easy to make a meter which will show the engine RPM, many cars have one installed. But to know the power in kW that the engine is providing right now, I also need to know the torque, because: \$...
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1answer
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Measuring ferrite core parameters

I have large amounts of inductors and transformers from power supplies or other undocumented sources. They are of course completely unmarked and I have no idea what kind of ferrite material they are ...
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3answers
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Using K-type thermocouple to measure human body temperature

Is there anything I need to he aware of when using K-type thermocouples? I got the idea by touching the probe. I can get a reading when measuring temperature for 30 seconds using a DMM. A commercial ...
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7answers
5k views

Soil moisture measurement

Background To kick-start my longstanding ambition of getting back into electronics, I decided to try and make a device that measures the soil moisture of potted plants to determine whether they need ...
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4answers
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Precise Resistance Measurement Techniques

This question is inspired by some basic questions on resistors I've read here lately. What's the most accurate/precise technique for measuring the value of a resistor you can think of? What level of ...
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2answers
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How to measure EC, pH, 10k thermistor, DO, and Ion-selective probes

Here are the sensors I am trying to measure and then convert into a 0-5V analog output: pH (acid or base): my understanding is you can use DC voltage to measure this sensor, just not sure what kind ...
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6answers
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how do energy consumption (Ah, kWh) meters work?

How do devices which measure energy consumed work? For example the ones in solar regulators/chargers which display how many Ah went into the battery and how many went out? Do they just measure the ...
5
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2answers
271 views

What is Noise Temperature?

Here's a good question for the professional electronic engineers of Chiphacker: What is noise temperature, and how is it used in designing receiving systems as a whole? (I've seen it specified for the ...
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3answers
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How do I measure CO and CO2 concentration in a gas?

I'm looking for a document with a description of a method to measure CO and CO2 concentration on a gas. I found some information about how to do it with infra red absorption, but not enough ...
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2answers
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How do you calculate the noise of an op-amp circuit?

I think I know how to do this, but you can find a lot of different instructions and calculators online that contradict each other. I have yet to find a clear, concise procedure for calculating the ...
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4answers
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3 Wire Digital Scale Strain Gauge Weight Sensor

How do I connect/use a 3 Wire Digital Scale Strain Gauge Weight Sensor? I took it from an old weight meant for people. :) The wires are red, black and white. I found this, http://www.nerdkits.com/...
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2answers
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Measuring VPP and DC offset of a 1Hz - 1MHz signal using MCU

I need to measure the peak to peak voltage and DC offset of a 1Hz to 1MHz sine/triangle wave. The signals amplitude varies between 0 and 2Vpp and the offset can vary between -2v and +5v. I will be ...
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7answers
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Measuring 0 - 1MHz ( 0.25Hz resolution) Squarewave using an MCU

I need to measure the frequency of square-wave that can vary between 0 and 1MHz, and has a resolution of 0.25Hz. I havent decided on which controller yet but It will most likely be one of the 20pin ...
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7answers
3k views

Vibration sensor (accelerometer?)

For growing crystals it is important that there are no vibrations. Is there a cheap and easy way to measure vibrations in the floor, like people walking, doors closing etc.? Perhaps an accelerometer ...
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3answers
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How do I measure the current flow to a component?

I'm building a hexapod robot using simple servos and I was wondering how feasible it was to measure the current flow to each servo (5-6V DC to a maximum of 0.25-1A (I haven't found the spec for the ...
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13answers
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Level of a water tank with a microcontroller

How do i measure the level of a water tank with a microcontroller?
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3answers
355 views

Measuring force developed by a robot

I've been playing around with a Lego Mindstorms NXT robot, gearing it for speed and power. To my dismay, when geared for power, it wasn't any harder to stop than when geared for speed -- I suspect ...