Which inductance meter to buy? - Page 3 - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 24th October 2009, 02:51 AM   #21
star882 is offline star882  United States
diyAudio Member
star882's Avatar
Join Date: Mar 2007
If you only need to measure a few inductors, you can use a dual channel oscilloscope and signal generator to measure the phase shift. (Use a known resistor as a load.) Then calculate the inductance. It works but is time consuming.

In ECEN 325 class, one practical quiz I had to do was identify unknown components using the tools available on the workbench (a signal generator, dual channel oscilloscope, multimeter, and power supply) and a few known reference resistors. The "unknown" components are encased in plastic with two terminals and could contain a resistor, capacitor, or inductor inside. My approach was to connect it into a voltage divider with a reference resistor and then vary the frequency while observing amplitude to narrow down the type of component. Then I do the phase shift trick (or just use the multimeter if it's a resistor) and calculate the value. I was able to obtain some pretty accurate results but I wouldn't want to deal with that every day.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 24th October 2009, 03:27 AM   #22
Pano is offline Pano  United States
diyAudio Moderator
Pano's Avatar
Join Date: Oct 2004
Location: SW Florida
Blog Entries: 4
That's a good class!
  Reply With Quote
Old 24th October 2009, 08:42 AM   #23
diyAudio Member
Join Date: Mar 2006
Location: Outside Copenhagen
Since I haven´t got my house full of technical equipment I am normally going for equipment with more functions ie. DMM´s with LCR function etc. In this way you are not "locked" to only doing one thing with the meter. A lot of measuring has to be done when making electronic circuits, loudspeaker cross-overs etc. so an extra DMM can easily be used.

Therefore, my suggestion would be to go for a DMM with the L-function (at least).

I have found a link which might be useable for you. The prices are not dirt cheap but also not too expensive, I think:

Digital Multimeters, DMM, Multimeter

Otherwise, try googling "LCR Meter" og make a search on eBay. You might be lucky finding some equipment that is exactly what you want / need.

  Reply With Quote
Old 25th October 2009, 04:48 AM   #24
anatech is offline anatech  Canada
diyAudio Moderator
anatech's Avatar
Join Date: Jun 2004
Location: Georgetown, On
Hi Karsten,
Since I haven´t got my house full of technical equipment I am normally going for equipment with more functions ie. DMM´s with LCR function etc. In this way you are not "locked" to only doing one thing with the meter.
I can see your point there, however a signal generator and an oscilloscope are basic tools you need on the bench. Of course, you can do many things with them, including measure reactive components. A frequency counter is another item that should be on your bench as well.

Now, if you look at the pricing on Eeekbay, an LCR meter is one thing you probably will not be buying. An impedance bridge can be much less expensive, and far more accurate than a function on a DMM. Speaking of these extra functions on a DMM, the only brand that was accurate, and held the accuracy was Fluke. The 87 was pretty accurate for capacitance, but you didn't get any other information about it. A bridge is far more useful and certainly expected in the room of a hobbyist that works on loudspeakers.

The other really big problem when people use a DMM is that they assume an accuracy far greater than what the reality is. At least a needle moving back and forth can remind the user that these readings are approximate. Even the more expensive Agilent / HP LCR meters have limited accuracy. In fact, the accuracy depends greatly on how the test is carried out and whether the leads and / or jig have been compensated for.

"Just because you can, doesn't mean you should" © my Wife
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
how to make this esr meter work with 250uA Panel meter dytln_02 Everything Else 2 27th January 2007 10:13 PM
inductance meter from a cheap meter? jarthel Parts 3 22nd September 2006 05:37 AM
Making a milliAmp meter, become a Volt meter redrabbit Power Supplies 11 26th May 2006 07:51 PM
t-amp vu meter and volt meter question.... rectaacies Class D 7 3rd February 2006 11:22 AM
VU Meter metal Chip Amps 3 11th July 2005 01:21 PM

New To Site? Need Help?

All times are GMT. The time now is 04:31 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2