Products > Test Equipment
XJW01 Auto LCR meter review ($120 bench top LCR meter)
exe:
--- Quote from: precaud on December 29, 2020, 03:04:17 pm ---https://www.ebay.com/itm/Digital-LCR-Bridge-Tester-Resistance-Inductance-Capacitance-Meter-ESR-w-Battery/284098649802
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It goes only to 7.8KHZ :(
precaud:
--- Quote from: exe on December 29, 2020, 08:07:46 pm ---It goes only to 7.8KHZ :(
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It's the same for them all!
--- Quote from: indman on December 29, 2020, 06:05:14 pm ---No, I don't like this model. A 2-line display(or small text on LED) instead of a 4-line display significantly impairs the usability of the device. In addition, the location of the BNC connectors assumes that the device will be in a horizontal position and a person will have to look into the display from above. It also complicates a comfortable measurement environment. ;)
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Agreed on the display lines, but I like the BNC position, you can easily attach fixtures to it. And having batteries inside with charger is a plus.
My post is not to condone, only to inform...
pizzigri:
--- Quote from: floobydust on December 28, 2020, 08:19:10 pm ---I bought an XJW01 last year "PCB Rev. 1.1", "Circuit Rev. 3.1", "Date: 2017/03/28" the price is reasonable.
Calibration instructions took a while to translate, a lot of pain and actually the hardest aspect of the kit.
They come with a cheap op-amp U108 is either TL081 or NE5532. The meter does OK, not great, I cannot read relay coil inductance or low value WW resistors (inductance) for some reason. It's as if the noise floor is poor. It struggles at 7.8kHz too, the MCU is slow.
There are several enhancements to F/W and H/W that the West does not get. They went STM32 and AD9850 DDS but the designer got tired of his work being ripped off so I think he closed off the design. The Russian's competed with their "RLC Meter Digital" design, all using HP's original design.
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Hello Floobydust,
For some coincidence I have two of these meters, one I got as a gamble on Amazon as it was listed for something totally different for like 20 US dollars.... well in any case, i wanted to ask you if you think the device could be improved, both by changing the admittedly poor bnc connectors and maybe replace the op amp you mention above with a better part (which one?).
Also, I plan to change the Kelvin clips with something better- would the GWinstek type clips be an improvement to the performance of the LCR meter? I would have to modify them to use BNC rather that Banana clips though.
Best,
Franco
Eta mod the name I mistook a fellow member for another...
parasole:
Quite an old topic, but let me answer you, who knows, maybe you still need it :)
Since I killed my DE5000, I was in an intense investigation for a DYI meter, not because it would be cheaper, but because I want full control and independence from a vendor who told me the repair will be more than a new meter...
Now thanks to this forum I think I found most of the available DIY meters, and this one seems to be simplest in the way it is executed, although all of them are more or less equal and use the same bridge architecture, just for this one I have everything in my hands including source code.
Possible improvements I see here are not that many, considering it is an entry-level unit, changing to a much better OPA has no reason, I am intending to use LF347 simple since I have many of them and they are a little bit improved version of TL082/84. Basically, for the front end, you need a high impedance input (FET input) and low voltage offset, so keeping stock TL082/84 or a little bit better OPA is OK. This meter has 7k8 highest test frequency hence even for G=9 as one stage is having, there is no problem with bandwidth. However, one point to look for is current sense ref resistors, having those at list 0.1% tolerance and low TCR (planning for 25ppm in my case) would help to increase the stability and calibration. One possible source of noise tests sine signal generation, maybe it would benefit from a better filter, but that requires more verification if that indeed is the case.
mawyatt:
How did you destroy your DE-5000?
Did you attempt a repair, or was it a total loss?
Best,
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