Products > Test Equipment
XJW01 Auto LCR meter review ($120 bench top LCR meter)
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Carrington:

--- Quote from: Hydrawerk on April 21, 2014, 07:49:01 pm ---Oh, I would prefer a Cyrustek based hand held LCR meter. Some of them also have 4-wire measurement.

--- End quote ---

Good value for money ( by the way excellent seller):
http://www.ebay.com/itm/DER-EE-DE-5000-High-Accuracy-Handheld-LCR-Meter-New-from-Japan-Free-ShIpping-/151122560024
http://www.ebay.com/itm/DER-EE-DE-5000-High-Accuracy-Handheld-LCR-Meter-with-TL-21-TL-22-New-Japan-/161104294237
Hydrawerk:
It runs on a 6F22 9 Volt battery. AAA cells would be better.
Carrington:

--- Quote from: Hydrawerk on April 21, 2014, 09:17:38 pm ---It runs on a 6F22 9 Volt battery. AAA cells would be better.

--- End quote ---
Well, nothing is perfect, or to taste everyone.  :)
kripton2035:
if this one is effectively open source, you can learn a lot from it ...
that's not the case with all the cyrustek proprietary meters.
dannyf:

--- Quote ---Nice project to study.
--- End quote ---

The hardware design is fairly ordinary, with the following exception:

1) P2.0 related circuits: it shorts the two inputs alternately, to allow the integration of the signal + its 90 degree offset. I used the same approach in my ESR meter - my implementation is DC oriented and his is AC oriented. But both do the job well. This allows the construction of a synchronized detector inexpensively and elegantly.

2) P1.5 - watch out for that, :)

3) the firmware has an elaborate calibration process. It is worth it to read through the Chinese version.

4) there are cases where the meter will fail, just like any other instruments.

Overall, it is well executed. I would have hoped that some one would implement the Russian LCR meter (designed around  a msp430) on a modern chip, like STM32F3 or KL25.

BTW, the sine wave generation is done via a filtered square wave output. The chip used here is quite limited. The compromise here is that one filter has to cover a wide range.

A better approach, on a mcu with multiple pwm channels, is to use separate filters for individual channels / frequencies. That can be easily done on a chip like PIC24F.
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