Re: A stable and repeatable low value capacitance meter
thanks for all answers! I didn't know that the name of those clips was "kelvin". BTW i checked digikey for them and was shocked by their prices! a set of 2 clips cabled to banana plugs was about
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i2NDT Claudio
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#483
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Re: Open source impedance analyzer
Please put all your data. I have an HP 4284A Precision LCR meter. It hasn¡¯t been calibrated for about 4-5 years, but when it was calibrated it was done by Keysight rather than a Mickey Mouse lab. It
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Dr. David Kirkby, Kirkby Microwave Ltd
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#482
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Open source impedance analyzer
Hi all, It seems this audience might be interested in an impedance analyzer that I designed/built that works from DC-100kHz with 0.1% accuracy over much of the impedance range. The motivation for this
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Eli M
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#481
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Re: A stable and repeatable low value capacitance meter
Not finding an online source for the "Hutale 4.2 LCR-DDS-F meter". Where does one purchase it? Ray, W4BYG -- This email has been checked for viruses by AVG antivirus software. www.avg.com
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Ray, W4BYG
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#480
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Re: A stable and repeatable low value capacitance meter
I have made Kelvin test clips using regular clip leads, just solder the wires as close to the tip as possible, or, at least the test current one. Preferably both. Mikek
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Mikek
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#479
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Re: A stable and repeatable low value capacitance meter
No, post any links you want, as long. Dave (group owner)
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Dr. David Kirkby, Kirkby Microwave Ltd
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#478
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Re: A stable and repeatable low value capacitance meter
I made my own test clips. You can see how I did it at, https://www.angelfire.com/electronic/funwithtubes/L_R_Probe.html I hope posting this link is not against the rules. 73 (Regards). Max K 4 O D S.
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MAX
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#477
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Re: A stable and repeatable low value capacitance meter
It appears to assume ideal components - it does not give you series R or parallel R. The test frequency depends upon the component, but as Stephen Menasian pointed out, the test frequency is
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Dr. David Kirkby, Kirkby Microwave Ltd
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#476
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Re: A stable and repeatable low value capacitance meter
Check this out https://github.com/coreWeaver/LC-Meter I will build it in a few weeks, as soon as the Nokia Display comes in its also L and C meter.. and can work on higher frequencies Nice jOB and
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Jempi ( ON7MA )
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#475
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Re: A stable and repeatable low value capacitance meter
For low capacitance values. I am happy with my vintage Tektronix 130. This was developed in the vacuum tube age and was probably originally intended for in-house measurments of CRT and vacuum tube
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SCMenasian
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#474
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Re: A stable and repeatable low value capacitance meter
The webpage says to contact him by email. I don¡¯t think it was any different - I don¡¯t recall a PayPal button for example. I wish I knew why the HP/Agilent/Keysight meters need one to enter the
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Dr. David Kirkby, Kirkby Microwave Ltd
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#473
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Re: A stable and repeatable low value capacitance meter
The latest version goes up to 50 kHz. I would suggest that if fitted in case, it would be sensible to fix 4 x female BNCs on the front, spaced 22 mm apart, in the order shown in the attachment, which
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Dr. David Kirkby, Kirkby Microwave Ltd
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#472
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Re: A stable and repeatable low value capacitance meter
Hi Claudio, it's the Hutale meter.? I emailed Dr Le Hung directly to buy the meter.? I don't know if he still has them for sale. The video shows the use of the Kelvin clips.
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Neil Smith G4DBN
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#471
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Re: A stable and repeatable low value capacitance meter
When I googled, among the top several hits was this one: https://docplayer.net/56990467-Hutale-4-2-lcr-dds-f-meter-lcr-bridge-meter-dds-function-generator-frequency-meter-kit-dr-le-hung.html There is
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Tom Lee
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#470
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Re: A stable and repeatable low value capacitance meter
hi Neil, sorry...but what are those "Kelvin probes from Dr Le Hung"??? I "googled" but couldn't find any plausible answer! best 73 de i2NDT Claudio
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i2NDT Claudio
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#469
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Re: A stable and repeatable low value capacitance meter
A while ago I compared the performance of a number of units like that from several different sources.? Some of them were very good, some were really bad.? I tracked this down to (mostly) the quality
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[email protected]
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#468
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Re: A stable and repeatable low value capacitance meter
I've had one of those "Hutale" LCR meters with Kelvin probes from Dr Le Hung for six years or so.? It works well and gives sensible answers, but really needs to be fitted into a box.? I broke one of
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Neil Smith G4DBN
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#467
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Re: A stable and repeatable low value capacitance meter
http://lcr-dds-f.atwebpages.com/en/ Note it is 4-terminal, and works on the principle of an autobalancing bridge, like at least some of the HP/Agilent/Keysight ones do. My Agilent 4284A (0.05% basic
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Dr. David Kirkby, Kirkby Microwave Ltd
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#466
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Re: A stable and repeatable low value capacitance meter
I use this LC meter and am very satisfied with it:https://www.box73.de/product_info.php?products_id=2561 LC meters on Ebay that look the same have a much worse specification. 73, Hans, ON4CDU [image:
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Hans Wagemans
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#465
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Re: A stable and repeatable low value capacitance meter
John K, I appended the circuit to show just how simple the meter is even with an added display.? The basic measurement code is in the original article. There are dozens if not hundreds of examples of
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[email protected]
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#464
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