Products > Test Equipment
Best CHEAP LCR meter for small capacitors and inductors?
iMo:
--- Quote from: pqass on November 23, 2022, 02:35:16 am ---I know you're probably not looking for a DIY LC meter now, but in case you've hit a wall, consider the LC-meter project below (or at least the oscillator part).
I'm currently implementing the LC+LM311 oscillator [on perf-board] just to validate the approach before committing further.
--- End quote ---
I built that famous LC meter myself some 20y back, wrote my own fw at that time. It works great.. The lowest C and L values are measured at something like 500-700kHz frequency.
PS: I would definitely use a relay with the 1n reference capacitor (not the npn transistor as you do)..
PPS: And do not forget the "Null" button where you measure the L or C of the probe wires before the actual measurement :D
ranchero:
Just ordered ET432 with Kelvin clip while Black Friday sale is going on (about $130US with all discounts). Will compare with ET-5000 when I will receive it.
hgjdwx:
LQ-9101 is better than DE-5000
ledtester:
About the LM311-based LC meter... I found another design which uses a 74HCU04D instead of the LM311:
https://www.pcbway.com/project/shareproject/LC_meter_of_using_the_franclin_oscillator_9b1ebd81.html
The description there mentions a "Dr. Hegewald" and I was able to find this discrete LC-tank exciter circuit credited to him:
https://home.kpn.nl/a.van.waarde/lc.htm
mawyatt:
Here's a post on using a cheap SMD Fixture connected to the DE-5000, well more kludged that "connected" ::)
Please note the entire thread and the earlier reference SMD 4.7pF cap used with the two SMD Fixtures and the Lab Grade LCR Meters for measurements.
https://www.eevblog.com/forum/testgear/cheap-smd-lcr-fixture-the-good-bad-and-ugly!/
Best and Happy Thanksgiving!!
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