Reading inductance with your DC voltmeter or frequency counter

[makuy]

mga master, mga sir may nakagawa na po ba nito sa inyo? ito yung sa nsa ESP website (Rod Elliott ).

[Ikasamoko]

link please..

[makuy]

http://sound.westhost.com/project121.htm

ito yung link nya sir kasamiko.

[Ikasamoko]

maganda sana to...





kaso yung counter naman need mo for display....


`

[makuy]

o nga sir konti lng ang parts, kya lang mas convenient yung isa kasi yung volt meter ang meron ako

[bravokilo]

hi sisters...indeed, we all need this kind of instrument once in a while...if you haved a frequency generator, you can also measure inductance...

Perhaps, sa circuit above, most of us do not have a freq counter. There is a project under Robotics ata....pero matrabajo. Sa Deeco may nkita ako freq metger for P2200.

HOWEVER, there is an IC to comvert frq to V. Nakalimutan ko lang number pero we can look it up. In whih case, we do not need a freq reader nor build he first circuit. thios one using the 555 is simpler then put an F to V converter.Then we calibrate and hav translation table.

BK

[bravokilo]

google LM2907 and LM2917 for datasheet, OR

[bravokilo]

You can use the LM556, 2 555 in one, di ba. so isang IC na lang! pagnilagyan mo ng cream yan, 3 in 1 na!

Start with known inductor. mayroon sa deeco mga inductors. get the V at that value, get it?

By the way, the LM555 can be made into a freq generator, square wave nga  lang. may table of values to use. connect the o0utput to the inductor's ends and read the V. Where it is owest, that is the freq at which the inductor is shorting the pulses. Try putting a capacitpr across. With a known Freq and know C, compute for value of inductor.

BK

[bravokilo]

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How to Measure Inductance With a Meter
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Mark Stansberry

Mark Stansberry has been a technical and business writer over for 15 years. He has been published in leading technical and business publications such as "Red Herring," "EDN" and "BCC Research." His present writing focus is on computer applications programming, graphic design automation, 3D linear perspective and fractal technology. Stansberry has a Bachelor of Science in electrical engineering from San Jose State University.

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By Mark Stansberry, eHow Contributor

updated November 28, 2010

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How to Measure Inductance With a Meterthumbnail The inductance of a coil can be easily determined with a signal generator and a voltmeter.

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Inductance, a parameter that determines the amount of voltage induced from a change of current, can be measured in a variety of ways. You can use a signal generator, a digital multimeter, an inductance capacitance (LC) meter or even build your own inductance meter with a kit. The least expensive and easiest methods use an AC voltmeter, a frequency generator and a simple test circuit that includes just a resistor. These methods, which are considered very accurate, require that you use a formula. The formula permits you to calculate the inductance based on the signal generator frequency and the value of the resistor used.

Difficulty:
    Moderate

Instructions
Things You'll Need

    * AC voltmeter
    * 1000-ohm precision resistor
    * Frequency generator
    * Inductor

Suggest Edits

   1.
          * 1

            Construct the test circuit. Connect one lead of a precision (1 percent) 1000 ohm resistor to one lead of the inductor or coil you want to measure. Connect the resistor's other lead to the positive terminal of the signal generator. Connect the unconnected lead of the inductor or coil to the negative terminal of the frequency generator. Connect the positive terminal of the AC voltmeter to the point where the inductor and resistor leads are tied together.
          * 2

            Tune the signal generator waveform. Set the signal generator such that it will produce a sine wave with a RMS (root mean square) voltage level of 1 Volt. Vary the frequency of the signal generator until the voltage on the AC voltmeter is equal to 0.5 volts, or one-half the input voltage signal. Make a note of this frequency.
          * 3

            Calculate the inductance. Divide the value of the resistor used (1000 ohms) in the test circuit by the product of 6.28 times the frequency (in Hertz) obtained in Step 2. The resulting value will be in Henries, which is the unit for inductance.


Read more: How to Measure Inductance With a Meter | eHow.com http://www.ehow.com/how_7568767_measure-inductance-meter.html#ixzz1bBNjhCZY

[bravokilo]

Nice, try thisone too:

http://qrp.webhop.net/Hints_and_Tips/Inductor%20Evaluation%20Method%20and%20Tools%20(K7HKL).html

[bravokilo]

I have the pix and schematics for a GDO,Grid Dip Oscillator. Excellentfor those who want to do RF experiments. making coils is not as dificult as many think. I hand wound many coils from transmitters and receivers in RC work. If you have one of those China toys, especially the one where the car simply backs up, those handheld tansmitters using 9V battery are excellent sources of frequencies. Mostly are in 27Mhz but you will find 49's as well. Also 72 perhaps.

make your coil, put a cap to make a "tank", attache a diode to an amplifier, tune to the toy TX. You do not have to make a GDO really.

The principle of a GDO is that when a coil is placed near an oscillator, some of its signal is absorbed by the dead coil under test. The grid of a vacuum tube triode running gher osc will show a dip in current, thus Grid Dip Osc.

I have my Heathkit Army Signal Gen which can go 310Mhz. Been using it for a long time for many purposes.


BK

[profpat]

http://www.electronicslab.ph/forum/index.php?topic=29525.msg545276#msg545276