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Best CHEAP LCR meter for small capacitors and inductors?

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mawyatt:

--- Quote from: hgjdwx on November 24, 2022, 02:41:39 pm ---LQ-9101 is better than DE-5000

--- End quote ---

Looks interesting but apparently only supports 10KHz, DE-5000 supports 100KHz!! This is an often overlooked specification, and the higher frequency range instruments need to employ more sophisticated circuits and algorithms, and why above ~100KHz the LCR meter price rises exponentially!!

Believe the DE-5000 utilizes a unique custom chip set that employs a high resolution SD ADC as well, also believe this is the same chip set utilized in the popular ET432 since both have identical Cal procedures (30 counts) & frequency ranges, and very similar specs. Soon we'll have a direct comparison of these two, as ranchero has both available :-+

Best and Happy Thanksgiving

thm_w:

--- Quote from: Vojtech on November 24, 2022, 08:24:51 am ---As Mawyatt mentioned, measurement of nH at 100 kHz needs mOhm resolution, so 4 wires Kelvin is a must. A quick test of ET432 with shorted inputs at 100 kHz - resolution is down to pH, the result is stable to some hundreds of pH. Capacitance measurement at 100 kHz with open input – offset is some tenths of pF (can be nulled out), the resolution is 1 fF, the result is stable to 1 fF. Of course, the moving of cables changes measured capacitance with some tenths of pF. I have no etalon of low caps or inductors, so I am not able to verify absolute accuracy. Still, its meaning is questionable – with such low values parasitics in real PCBs play a significant role so absolute accuracy is questionable here. I think ET432 is better than DE-5000 with still an acceptable price.

--- End quote ---

Yeah that looks quite good.
Wonder if ET430 can be hacked to ET432. ET433 seems like it might have different hardware inside.

balnazzar:

--- Quote from: egonotto on November 22, 2022, 11:00:54 am ---Hello,

is an indirect measurement via the resonant frequency with L or C connected in parallel an alternative?

Best regards
egonotto

--- End quote ---

Beware of indirect measurement if you are not super-experienced. Parasitic stuff in the components will make you calculations' result quite unreliable.

mawyatt:
This may be the chip set utilized in the DE-5000 and ET432. The chip set appears to incorporate bridge approach and contains most of the necessary components, including high res ADC (likely high bit count Sigma-Delta type), to realize a quality LCR result.

Believe this chip set is the main reason these handheld LCR meters perform and yet are reasonably priced, classic example of custom chips improving performance and reducing costs.....integration rules :-+

http://www.cyrustek.com.tw/wp-content/uploads/ES51920.pdf

Best,

Vojtech:
ET432 has a higher resolution and better accuracy than mentioned chip, so different hardware has to be used.
To thm_w : ET432 comes with Kelvin clips, ET430 does not.

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