Circuit and firmware COPYRIGHT; 1996-2014

inductance capacitance meterlcm34.jpg (6336 bytes)

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L/C Meter IIB (II is Roman numeral 2)

is a hand-held, digital

Inductor inductance meter

Capacitor capacitance meter

with a four digit display,

Don't be fooled by cheap knockoffs "borrowing" my copyrighted designs. 
You won't get the accuracy, quality, guarantee or technical support you get from AADE.

You can save $30 and then wish you hadn't

It is ideal for RF and audio work where accurate measurement of small values is needed.

maximum resolution of 1 nHy / .01 pF
maximum range of 150 mHy / 1.5 uF.

Capacitors must be non-polorized as the test signal is AC.

The unit features

ACCURACY ANALYSIS 4/30/2010 analysis against standard Inductor and capacitor sets.

It is available as a "solder it together and it works" kit.



What some of my customers have had to say.


L/C Meter IIB inductance / capacitance meter is widely recognized for its accuracy and low price.

PRICES? click here.

Specifications? click here.

Instruction Manual? click here.

in Japanese


click here

I have an unconditional  money back guarantee, even on kits

(as long as parts match current production, can't keep stock of obsolete parts).

Satisfaction guarantee is full refund within 30 days.

Good news is; repair service guarantee is lifetime

Bad news is; it is my lifetime, not yours


ERROR ANALYSIS 4/30/2010 error analysis against standard Inductor / capacitor sets.


Operating modes:

When the Lx and Cx switches are off the ZERO switch acts as a MODE SELECT.

L/C Meter IIB zeros out stray inductance and capacitance by storing their values in RAM and subtracting them from the measured values. It can zero out any value in it's range allowing longer test leads and slightly improved accuracy over L/C Meter II.

L/C Meter IIB works by measuring the shift in frequency caused by inserting an unknown into it's oscillator tank circuit. A PIC micro-controller measures the frequency before and after. It then computes the value of the unknown using a floating point math package and displays the result on a 16 character intelligent LCD display.

L/C Meter IIB will NOT measure inductors designed for 60 or 120 Hz applications such as power transformers, filter chokes or motors. The minimum test frequency is about 20KHz and these devices have enormous core losses at that frequency.


lc evolution.jpg (15735 bytes)

Evolution of the L/C Meter.

Have not been able to think of any improvements since 1997.


A Kelvin clip is an alligator clip with electrically isolated jaws.

Clip the plastic at the tips even with the copper tongs using a fingernail clipper.
Attach 4" to 6" heavy stranded wire and banana plugs as shown.
Pick up the SMT part like a tweezer and let go, it is held in the probe by springs.
Has the advantage that you can get your body out of the measurement because you don't have to hold the probe.
If this seems confusing, all will become clear when you have the clip in your hands.

kalvinkit.jpg (8743 bytes)

Available as a Kit $20.00 postpaid

Other TEST ADAPTER ideas for regular and SMD parts.

Chuck, K7QO's Patented jig
quoted from
Chuck's homepage

"Here are some pictures of a piece that I designed and has been published in several places. Almost All Digital Electronics,, has an L/C Meter that sells for $99.95 for the kit, which just about any experimenter must have for serious work. In order not to bend leads and mess with different geometries I used PC board material to make two rectangular pieces. I then used a nibbler to make a centered channel for the binding posts to go into. Then soldered two machined socket pins for inserting component leads into. That's all there is to it. "


jon, EA2SN's version as inspired by Chuck's design.

Here is a method you can use to measure Varactor diode capacitance

Hi Neil,
Attached are two pictures--of the meter with simple fixture using piece of
PCB, and picture of the diagram.
I can redo, if not suitable. There's not much to it. The key is isolation of
the right-side input jack with the large capacitor. 100,000pF is much larger
than the largest varactor (~500pF), thus has little effect on the
measurement. An accuracy check can be done by measuring an ordinary
capacitor (under 1000 pF) in the fixture. Most varactors are specified at 1
volt or 4 volts for maximum capacity, and can be measured by setting the pot
for the desired voltage. The voltmeter can remain connected; it doesn't
affect the test.
I used a Dremel tool with a narrow carbide bit to hand-cut the several lines
for mounting the trimpot and for isolating the various sections. Holes were
drilled and banana plugs soldered to the PCB. I used mini-clips for holding
the varactor.

AADE LC varactor tester 005.jpg (22020 bytes)

Steve was one of my first customers several years ago so his meter has the

older panel decal.

AADE LC varactor tester 007.jpg (20487 bytes)

For those who might use the meter for long periods of time or continuously this item may be of interest. 

I DO NOT SELL IT.  Try googleing it.

9VADAPTER.jpg (5063 bytes)

or it would be pretty easy to make your own from an old 9 to 12 volt DC wall transformer. Just remember that the buttons on the battery clip should be the reverse (male / female) of what they would be if clipped on a battery.

Here is how Robert from Slovenia installed an RCA jack so he could power it from a modified DC wall transformer.

slika 1.JPG (7159 bytes)  slika 2.JPG (5930 bytes)

leaving the battery clip installed so it could be used portable when needed.

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