| Products > Test Equipment |
| LCR meters - capacitance measurements at high frequency. |
| (1/5) > >> |
| Traceless:
Hi everyone, I was just checking some Nichicon PSF series 270µF, 16V capacitors. The data sheet states that those caps should have a dissipation factor of < 0.1 (measured at 120 Hz) and an ESR of <= 10 mOhm (measured between 100 and 300kHz). Measuring the ESR in high frequency mode I notice that my meter only shows nonsensical capacitance values (see screenshots). Since the data sheet is not super clear if the capacitor is expected to maintain its capacitance at high frequency I wonder: Am I hitting the physical limit of electrolytic capacitors or the limit of my test gear? Or in other words can you even measure the capacitance of this kind of electrolytic capacitors using frequencies of >= 100 kHz? (Attached: measurements of a sample cap at 100 Hz, 120 Hz, 1 kHz, 10, kHz, 100 kHz and 200 kHz) |
| Tomorokoshi:
How long are your test leads? What is the loop area of the leads? Do you have a picture of the setup? |
| Traceless:
The lead length is 60 cm (~75 cm, with clips and connectors). I also attached a picture of the setup. |
| gamalot:
100KHz is too high for aluminum electrolytic capacitors. |
| Tomorokoshi:
Run the Short and Open Compensation at the high frequency and measure again. |
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