Timeline for Best method to determine current in ESR meter
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 14, 2019 at 8:19 | vote | accept | GB - AE7OO | ||
| Jun 14, 2019 at 8:04 | answer | added | GB - AE7OO | timeline score: 0 | |
| May 20, 2019 at 16:18 | comment | added | GB - AE7OO | Ok, I have the STM32F373 main board done. Right now I'm testing DAC output filters for the higher frequency's. As I'm using lookup tables for the sine output, at lower frequency's I'll just use a large number of samples with a simple 3 stage LP filter. I'm thinking of using a AD812 as the output amp as it should have no problem with .2, .5, 1 and 1.5V out with decent current. I may not be able to measure the ESR of pF caps, but just about anything else should be good. Once I have that filter, I guess I'll just test which is better, the current transformer or shunt. I'll report back. | |
| May 11, 2019 at 23:55 | comment | added | D.A.S. | Usually phase and amplitude of output voltage with auto ranging sine current determines the mode of RLC then reactance in F or H and resistance in Ohms. | |
| May 11, 2019 at 17:23 | comment | added | GB - AE7OO | And please note, all 3 SD ADC can be triggered at the same time. I was planning on first running a small test to determine zero crossing and then take 10 measurements per frequency. I'll have choice of doing a single freq or a span. | |
| May 11, 2019 at 17:15 | history | edited | GB - AE7OO | CC BY-SA 4.0 |
added 53 characters in body
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| May 11, 2019 at 17:07 | comment | added | GB - AE7OO | @SunnyskyguyEE75 My DAC output buffering will allow a choice of constant voltage or constant current. I thought I was clear in how I am testing with 2 voltage tests and a current test. My problem is choosing the best way to test the current. | |
| May 11, 2019 at 15:17 | comment | added | analogsystemsrf | Fundamentally, the ESR is the quadrature component to the charging-current. Hence a precision ESR must sustain clean I and Q extraction. How to specify that? | |
| May 11, 2019 at 14:36 | comment | added | D.A.S. | The foundation for any design is your design specification and test method, not the parts. An LCR meter uses a constant current source for sine wave at various frequencies to measure voltage and phase shift. | |
| May 11, 2019 at 14:23 | history | asked | GB - AE7OO | CC BY-SA 4.0 |