Electronics > Projects, Designs, and Technical Stuff
How to measure ESR?
The Electrician:
Since Vs will be the voltage applied to the DUT, and it's an AC voltage, when measuring electrolytics we don't want to apply a reverse voltage of more than a volt or so to the DUT, so Vs in that case will typically be .5 VAC. Maybe lower if doing in circuit testing with semiconductors in the circuit that we don't want to turn on.
When measuring inductors, we might want to apply a higher voltage to the DUT. Some Keysight meters such as the E4980A can apply up to 20 VAC.
Since Rr is a range switching resistor, its value should be near the magnitude of the DUT's impedance.
daisizhou:
https://www.eevblog.com/forum/projects/led-lamp-bead-display-esr-test-meter/new/#new
I am planning to make
OM222O:
--- Quote from: The Electrician on May 04, 2019, 02:39:41 pm ---Since Vs will be the voltage applied to the DUT, and it's an AC voltage, when measuring electrolytics we don't want to apply a reverse voltage of more than a volt or so to the DUT, so Vs in that case will typically be .5 VAC. Maybe lower if doing in circuit testing with semiconductors in the circuit that we don't want to turn on.
When measuring inductors, we might want to apply a higher voltage to the DUT. Some Keysight meters such as the E4980A can apply up to 20 VAC.
Since Rr is a range switching resistor, its value should be near the magnitude of the DUT's impedance.
--- End quote ---
Yes that makes sense! thanks a lot for the info!
--- Quote from: daisizhou on May 04, 2019, 02:58:43 pm ---https://www.eevblog.com/forum/projects/led-lamp-bead-display-esr-test-meter/new/#new
I am planning to make
--- End quote ---
please update your post when you finished the project
Shock:
http://www.kerrywong.com/2015/11/23/esr-measurement-using-multimeter-and-function-generator/
Shock:
If you are interested in a simple design forum member Jay_Diddy_B has one here with a written overview. It's 100kHz and has input voltage protection and a low build cost. Requires a multimeter to read the measurement. https://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/
If you are interested in a kitset or off the shelf. Chinese ones start from $20 upwards. I'd recommend though a Bob Parker ESR meter design. Altronics, EVB and Anatek sell them for around $100, these can be cheaply modified to have better input voltage protection.
The DER EE DE-5000 (LCR meter) also measures ESR and has multi frequency support, you're looking at also around $100. Not the simplest for in circuit testing and no decent input protection, a good value instrument however, hard to beat features and accuracy for $100.
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