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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How to measure resistance

I have a project to build heating element using silver ink. My specification is the heating element must be in range 2 to 2.6ohm I will design the circuit for the heating element, but have a problem ...
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29 views

3 channel vs. 4 channel 120/240 power meter

So I live in the US, where we have center tapped power for residential use, with two hots and a single neutral wire. My question is what would be the potential effective difference in power ...
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3answers
54 views

How use DMM thermocouple probe hands-free to monitor heatsink temperature?

I suppose this is more of a lab practice question than electronics per se, but I wonder if there's a standard-ish way to mount the K-type thermocouple that comes with my Fluke DMM so I can monitor the ...
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323 views

Could you explain how this current measurement circuit works?

I have a schematic for current measurement, but I don't really know how can I calculate the output of it. The op-amps are on +-12V. The output of the circuit is 0.2*I(Rs) [V] (--> this is what I don't ...
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53 views

Measuring P and Q of house appliances

In order to obtain Power-Voltage characteristic of domestic loads (coffeemaker, microwave oven etc) I need to measure consumed active and reactive power at vooltage range U=[0.9-1.1]Un. Is there ...
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1answer
87 views

Bioelectrical Body Impedance Analysis?

On what principle Bioelectrical Body Impedance Analyzer works? I thought about this many times, and I wanted to know is there really a way to precisely measure all those body parameters with this ...
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1answer
26 views

Measuring sinusoidal frequency using the common LC100-A LC meter [closed]

So I need a Frequency meter for sinusoidal signals. I happen to have this common LC100-A L/C meter that is quite good for a very good range and quite cheap as well. Assuming it does so by ...
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1answer
68 views

Convert dB A to dB SPL

I am trying to calibrate an audiometer that gives outputs in dB SPL. However, the sound meter that I am using to calibrate the audiometer registers in dB A. Is there a formula to convert from dB A to ...
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1answer
53 views

Quick, accurate and easy distance measuring systems?

My company is working on creating better designs for pipe measurement devices. Our main competitor is the Tally-Rite 2000 (http://www.scansystems.com/automated-tallies/tally-rite-tr-2000/), which is ...
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47 views

Measuring Capacitance using AVR

I am trying to make a capacitance meter with AVR Atmega16. I use of analog comparator inside micro. Means when negative pin(AIN1) of comparator reach to postive pin(AIN0) micro going to interrupt ...
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4answers
309 views

Measuring a huge resistance on low voltage

I was thinking on this theoretical experiment for a while, but nothing useful came into my mind. We have a "resistor" (rather a material like plastic) with a resistance expected to be very high, say ...
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42 views

How do i measure the output voltage of lm35 with digital voltmeter?

I know this is a very stupid question. Lm35 has 3 pins: Vcc, Analog output voltage, Gnd. Is it ok to measure between analog output voltage and gnd? Im asking because Vcc and Gnd is a dc.
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36 views

How to measure ratings of a transformer

If I am given a transformer without any datasheet of it. Then how can I measure the maximum current and voltage rating of the transformer?
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104 views

How to measure frequency of sine wave?

How to measure frequency of sine wave using pic microcontroller? I found the article on this website http://microcontrollerslab.com/sine-wave-frequency-measurement-using-pic/ But I didn't understand ...
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3answers
128 views

Measuring the inductance of a coil?

I have a hand-wound coil I'm using in an LC Tank circuit. Using my multi-meter, I found out that the coil is drawing .6mA at 9v. Using Ohm's Law... $$R = V/I$$ $$R = 9/.0006$$ $$R = 15kΩ$$ Is there ...
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1answer
44 views

Can I measure large force using series FSR?

Is it possible to measure large force using multiple Force Sensitive Resistors in a series? Will I have to stack the resistors up? Will the measurement be reliable if I place them side by side? I ...
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2answers
110 views

ADC calibration in ATTiny88

I'm writing an embedded app for ATtiny88 - one of its task is to measure voltages of serial connected two 12 V car batteries. The microcontroller is powered from around 4.5-5 V (LM317), measured ...
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1answer
59 views

How can I make an accurate torque/RPM curfer for the random electric motors lying around my garage?

I am blessed with a garage filled to the brim with all sorts of electric motors, most of them sourced from broken household appliances and the like. I would like to gather some data about them, like ...
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1answer
48 views

If you want to test a step-up transformer, must the load resistor equal the source impedance?

Ideally, do you want to add R1 to balance out the impedance so you get an accurate reading? simulate this circuit – Schematic created using CircuitLab I'm trying to find out the turn ...
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3answers
189 views

Measuring change in inductance

I have a coil whose inductance will be changing continuously. I would like build a circuit to monitor the change in inductance continuously. Can I just use a RCL circuit and give it a sine wave of f ...
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0answers
65 views

Directional Coupling at kHz Frequencies

I want to precisely measure the forward and reverse power on a high-voltage power supply that operates from 10-100kHz, at power levels on the order of 20W. To do this, I need to make or buy a ...
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66 views

How do you correctly measure the gate voltage of a MOSFET?

If you have a half-bridge, or an H-bridge, or some other usual configuration; and you want to see the voltage you are getting on the gate, to check for any errors and shoot-through. Do you do it like ...
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41 views

measure capacity of a battery after charged

I have two AAA rechargeable batteries that claim to have 550Mha capacity. My first question is, how can I measure the Mha and make sure the battery is fully charged? Second question and related ...
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115 views

Is there a way to measure three discrete resistances simultaneously?

I'm working on a test box for fencing body cords. These cords are always 3 wires, and will plug into a box that I'm still designing. The test box I currently use connects to a multimeter and has a ...
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1answer
77 views

How is water resistance of a device measured?

This question has relation to physics as well, but since it is electronic related, it is here. I was watching a video that is testing the water resistance of Apple Watch. They say, at 3 feet the ...
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228 views

Creating a large 18650 Array

I am looking for some help with wiring for a large battery array using 18650 lithium ion batteries. Ok so I am looking at going solar and lead-acid batteries are too low overall capacity and their ...
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152 views

Current decreases while reading

I'm a bit confused about reading current on a breadboard using a multimeter (I'm a complete beginner with electronics). I'm using a self-powered breadboard which should deliver 5V / 1A. Multimeter is ...
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48 views

Circuit for measuring static charge

I want a cheap tool for investigating the source of and solutions for static electric shocks (from a vehicle). This link shows a particularly attractive solution; just a FET, LED, resistor and ...
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83 views

How does one measure the power factor?

How does one measure the power factor? $$\text{power factor}\equiv\frac{\text{power}}{|V||I|}=\frac{R}{\sqrt{R^2+(1/\omega^2C^2)}}$$ for an RC circuit driven with \$V(t)=V_0\cos{(\omega t)}\$.
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1answer
40 views

Vector Network Analyzer - The effect of increasing the number of measurement points

Does increasing the number of measurment points make the measurement time longer? RBW value does change the time, but does sweep bother the time of taking a single sample? I'm looking for ...
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1answer
42 views

Partial load failure detection circuit

I'm working on the power supply of a temperature controller which sends about 5kW of power maximum (230VAC 50Hz) into 3 sets of 12 heaters (actually, 3kW + 1kW + 1kW). I'm at the stage where I need to ...
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1answer
40 views

What's the usage of storing recorded measurements of multimeter and soldering iron station in computer?

Assume you want to purchase a multimeter for your job. some multimeters have a USB interface to store the recorded measurements in the computer and for this feature, you have to pay more money. but ...
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RIN measurement of CW laser

Right now Im doing an RIN measurement of a CW Raman fiber laser. In theory, Im supposed to see a relaxation oscillation which manifests as a single peak in the trace. What if I can't detect the ...
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90 views

Is Induction Wattmeter ,Energy Meter and Watt Hour Meter the same thing

I have a topic to study regarding Energy Meters. In the Syllabus it says Energy Meter, in the textbook it says Induction Wattmeter and one online reference by IIT, says WattHour Meter/Induction Type ...
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26 views

Does higher clock speed equate to higher resolution of distance measurement using RF?

I am trying to create a simple measurement system using RF but have found only devices that have fairly large windows of accuracy (+/- 1ft is the best one I've found yet). If I want to measure the ...
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2answers
38 views

Coil and Core-What exactly this is?

Im learning about electrical measuring instruments(PMMC).In this textbook it is said that a rectangular coil is wound on a aluminium former.Inside which there is an iron core. My question is what ...
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3answers
78 views

Which low pass frequency filter to configure to measure/calculate DC-DC converter efficiency?

I am measuring the DC-DC converter active power (P in watts) efficiency of a TI (Webench) LM3150 PCB that converts 12 to 5VDC. In the answer of question Measuring precisely the efficiency of a power ...
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3answers
236 views

How do utilities calculate transmission lines impedance?

I'm an electrical engineering student getting into Transmission Circuit Analysis, and a question came out to me: How do utilities measure their transmission lines impedance? Do they use special ...
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1answer
112 views

How to correctly use a LC meter/bridge

I have a LC meter at hand that I'd like to use it to measure the inductance (dominated by L1) of a circuit branch like this : simulate this circuit – Schematic created using CircuitLab ...
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61 views

Thickness Measurement

I would like to measure the thickness of a stack of paper without touching it. The measuring device needs to show if one sheet is removed. I do not need to know the measurement in inches. Units are ...
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102 views

How can I make the dimensioning of a temperature monitoring circuit?

I need to design a circuit to measure temperatures in the range 15-40 degrees C (this will later be the basis for a regulator of a peltier-element for a fridge). I tried a circuit using the ...
3
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2answers
135 views

Under water distance measurement

For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high ...
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1answer
80 views

Characterization of Power Harvester

I have chosen a power harvester to power a few things as part of a wireless system. This one is the one I have and it seems to be operational: http://www.powercastco.com/PDF/P2110-datasheet.pdf ...
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4answers
459 views

Is this true RMS?

This question is about obtaining a true RMS voltage reading from a running sampling ADC. Does this give me a true RMS reading, or where did I made a mistake? Construct a ring buffer of an large ...
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1answer
202 views

Measuring Output Amps From a Power Supply

I am in the quest to build a cheap bench power supply, i have successfully designed, built and tested the entire voltage circuitry. The device includes a graphic LCD screen that displays the voltage ...
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2answers
38 views

Technique to measure/infer Vf for LED given If

This isn't the normal resistor question, and I'm familiar with the theory and Which is better: using a resistor with an LED, or "precisely" matching the Vs to the given LED's Vf rating? ...
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1answer
135 views

How to measure the quality of a USB charging cable?

I have a set of USB cables (data and charge) and I noticed that, for a given charger, the charge time differs by cable. What would be a good way to measure the charging fitness of a USB cable? ...
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1answer
67 views

Abstract Datasheet Dimension Notation

I am attempting to create a footprint for a Surface Mount Component and I am using the manufacturer's datasheet for reference. They include PCB dimensions but the notation used is a bit confusing. It ...
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69 views

how work this flow meter

As you know , The principle of operation for the magnetic flow meter is based on the Faraday’s Law of Electromagnetic Induction.An electrical current (I) is applied to a coil package inside the flow ...
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65 views

How to calculate distance between two objects(robots)?

If I have two soccer robots, and want each robot knows the distance between itself and it's teammate, how can I do that? (without external supervisor camera)