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Old 11th February 2012, 10:55 PM   #1
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Default Low cost RCL meter??? recommendations?

Can anyone recommend a low cost but decent meter for measuring inductance? I have some crossover coils I need to measure and figure out what they are. or at least get close.


Zc
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Old 12th February 2012, 03:02 AM   #2
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If I didn't expect to make a large number of measurements, I'd get a good quality (film) capacitor of decent precision (1% or 2%), then put it in series with the inductor and a resistor of any convenient value. Find the resonant frequency (use your 'scope in X-Y mode to tune for voltage and current in phase), then calculate the inductance.

Dale
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Old 12th February 2012, 03:05 AM   #3
col is offline col  Australia
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I use my WT3. If your going to buy something might be worth getting one of them instead, that way you can test woofers as well.

col.
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Old 12th February 2012, 07:12 AM   #4
Frex is offline Frex  France
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Hi Zero Cool,

I can recommend you this DIY design.

It is based on the design from Dr Le Hung , you can find all infos about
this design on his web page HERE.

It can measure Inductance, capacitance, frequency and the ESR of capacitors.
I bought him the full kit (all parts and PCB) for 50.
It's a reasonable price, and it work very well.

Regards.


FRex
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Old 12th February 2012, 01:28 PM   #5
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Thanks everyone! I will look into all those options. I like the P-E WT3 idea, multiple uses and all!

I have a box of coils i need to measure. none are marked and all are different sizes. so i figured I would measure them and mark them and see if any would be useful.
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Old 12th February 2012, 01:30 PM   #6
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Quote:
Originally Posted by dchisholm View Post
If I didn't expect to make a large number of measurements, I'd get a good quality (film) capacitor of decent precision (1% or 2%), then put it in series with the inductor and a resistor of any convenient value. Find the resonant frequency (use your 'scope in X-Y mode to tune for voltage and current in phase), then calculate the inductance.

Dale
This sounds like a very low cost idea. but would require some education on how to do this! I have plenty of high quality film caps on hand. would need to see what the Tol% is but i know I have 1uf, 2uf 5uf etc etc on hand.

Care to educate us on how this is done??

Zc
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Old 14th February 2012, 04:22 PM   #7
cliffyk is offline cliffyk  United States
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I have both Peak Electronics' Atlas LCR40, and their ESR70.

An amazing and convenient to use pair of instruments, their DCA55 semiconductor tester is also a great tool...
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Old 14th February 2012, 04:30 PM   #8
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Quote:
Originally Posted by col View Post
I use my WT3. If your going to buy something might be worth getting one of them instead, that way you can test woofers as well.

col.
Oh hey, duh. I have WT2! It says sub 100pF measurements can be made if the device is calibrated for measuring capacitors. Thanks for the reminder! I can match components now.
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Old 14th February 2012, 08:13 PM   #9
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Quote:
Originally Posted by Zero Cool View Post
This sounds like a very low cost idea. but would require some education on how to do this! I have plenty of high quality film caps on hand. would need to see what the Tol% is but i know I have 1uf, 2uf 5uf etc etc on hand.

Care to educate us on how this is done??
I haven't forgotton - I'll work on writing it up this week.

Dale
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Old 14th February 2012, 10:34 PM   #10
sasha70 is offline sasha70  United Kingdom
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Hi, what about this instrument:
eBay - The UK's Online Marketplace
Any body used this one?
Regards.
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