| Products > Test Equipment |
| XJW01 Auto LCR meter review ($120 bench top LCR meter) |
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| WhichEnt2:
--- Quote ---But this is also searchable for those who bother to do it. So no need for me to write a half baked explanation of things that are already out there. --- End quote --- Sure. --- Quote ---PS If you search the web for "eevblog xjw01 7.8khz" --- End quote --- This and other (decision not to use ICL7135) nuances of xjw01 design is clearly described in machine-translated doc for early revision of meter. --- Quote ---"lcr meter 9.6khz" you will learn even more. --- End quote --- Results is fully stuffed with some lcr meter which is made by Chroma. I learned that their manual for that meter and appnotes on lcr related info not nearly as good as same docs from HP / Keysight. Very unexpectedly. I'd bet you meant something about difficulties in implementation precise 10 k vs using just-close-enoguh don't-even-have-to-use-extrapolation 9.6 k. |
| AG7CK:
Well, I guess I should have kept my hands out of this hole of worms ... When in my naivety I search "lcr meter why 9.6khz not 10khz" or similar, I get answers like '10 kHz = 9.6 kHz' even from an Agilent dokument: --- Code: ---[PDF]Agilent U1731B/U1732B Dual Display Handheld LCR Meter - Keysight literature.cdn.keysight.com/litweb/pdf/U1731-90059.pdf requirement. This affixed product label indicates that you must not .... The 20,000-count dual display handheld LCR meters (U1731B and ...... 10 kHz = 9.6 kHz. [PDF]878A and 879 Dual Display LCR Meter - Mouser Electronics [url]https://www.mouser.com/ds/2/43/879_manual-707041.pdf[/url] controlled meter for measuring functions of inductance, capacitance and ... Extremely simple to operate, the instrument not only takes ..... 10KHz= 9.6 KHz. [PDF]Tenma 72-1025 LCR Meter - UNC Physics [url]https://users.physics.unc.edu/~sean/Phys351/techresource/docs/Tenma72-1025.pdf[/url] Benchtop LCR Meter. Model 72-1025 ...... mode. The dark areas are not provided on this meter. 100Hz. 120Hz. 1KHz. 10KHz. Resistance .... 10KHz= 9.6 KHz. ....... --- End code --- WTF ... The reason why 10 kHz = 9.6 kHz and 7.8 kHz is close enough to 10 kHz, is probably related to microprocessor crystal frequencies and prescaler / divider factors (used for test oscillators). So 100/120 - 10k/9.6k or 7.8k really doesn't matter. Start by choosing low frequency 100 (or 120) for PSU electrolytes, 1k/10k for micro- to nanofarad sized audio stuff and similar, and 100k for handfuls of picofarads. The manual https://users.physics.unc.edu/~sean/Phys351/techresource/docs/Tenma72-1025.pdf over is good. Read it and go search on your own. ---ooo--- Edit: Copy from http://literature.cdn.keysight.com/litweb/pdf/U1731-90059.pdf: " Test frequency accuracy: ±0.1% ... 100 Hz = 100 Hz 120 Hz = 120 Hz 1 kHz = 1010 Hz 10 kHz = 9.6 kHz ... " :o |
| nctnico:
--- Quote from: buildafriend on June 15, 2018, 11:41:18 am ---The recently recommended paper on impedance measurement was extremely helpful, now you've got me digging. And yeah I wish I could afford a normal LCR meter before this one! There's no reason to settle for a lesser meter when you have the ability to learn a better one that costs less. Does this not count as research ;) The old art of communicating with people ;D --- End quote --- Define normal LCR meter. After I bought the XJW01 I also bought an old HP LCR meter (something with ...74) which supported 100kHz as well. It turned out the XJW01 is way more accurate especially for low values (like the milli-ohm range). Ofcourse no bias voltage but with a simple external circuit (DC blocking capacitor) you can add that to the XJW01 as well. End of story: the HP LCR has left the building. I got a network analyser instead which can do frequency sweeps as well. |
| Specmaster:
--- Quote from: nctnico on June 15, 2018, 10:34:56 pm --- --- Quote from: buildafriend on June 15, 2018, 11:41:18 am ---The recently recommended paper on impedance measurement was extremely helpful, now you've got me digging. And yeah I wish I could afford a normal LCR meter before this one! There's no reason to settle for a lesser meter when you have the ability to learn a better one that costs less. Does this not count as research ;) The old art of communicating with people ;D --- End quote --- Define normal LCR meter. After I bought the XJW01 I also bought an old HP LCR meter (something with ...74) which supported 100kHz as well. It turned out the XJW01 is way more accurate especially for low values (like the milli-ohm range). Ofcourse no bias voltage but with a simple external circuit (DC blocking capacitor) you can add that to the XJW01 as well. End of story: the HP LCR has left the building. I got a network analyser instead which can do frequency sweeps as well. --- End quote --- Yes I believe that the XJW01 is pretty accurate and of course it has another big advantage over the HP LCR meter, size, the HP one is massive, its as big as a 1740A scope. |
| The Electrician:
--- Quote from: Specmaster on June 15, 2018, 11:11:13 am ---And which manuals would they be? --- End quote --- This one is good: http://www.componentsengineering.com/wp-content/uploads/pdfs/LCR-Measurement-Primer.pdf |
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