I watched this fun video: How DC Clamp Meters Work (And other ways of measuring electric current).
How DC Clamp Meters Work
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Category Archives: Electronics
The DANGERS of Inductor Back EMF
Watched this one today: EEVblog 1409 – The DANGERS of Inductor Back EMF.
I learned about back EMF, freewheeling, snubber, flyback, or clamping diodes…
In this video I also learned that BPJ transistors have a storage time, or switch off time, in the order of microseconds, e.g. 5 μs. That probably explains what I saw when I tried to measure the frequency response of my DTL OR GATE.
Ground Channel Coupling
Over here I asked about ground channel coupling because I didn’t understand how it could be useful.
All it does is tie the channel input to ground. But it doesn’t do that by shorting the channel input, rather it just substitutes the probe input for a ground input.
Apparently this used to be useful for calibrating old CRO scopes. You would set to ground channel coupling, set ground where you would like it on your cathode ray tube, then set back to either DC or AC coupling.
Measuring Input Impedance of MSO5074
Over here I asked about the measurements I was getting when I tried to measure the input impedance of my scope with my multimeter.
I was getting a reading I didn’t expect or understand, but that turned out to be because of a dud BNC to banana adapter that I was using.
For some reason this adapter had either a 1.5 MΩ or a 6 MΩ resistance across it. It would change from time to time when I plugged in banana plugs. Weird. I can only assume some sort of manufacturing problem.
I threw the adapter in the bin and measured again with functional equipment and got the reading of 1 MΩ that I was expecting.
Keysight Premium Used
Today I discovered Keysight Premium Used. But it’s still all way out of my price range.
Plug your RSA into your MSO
Over here you can see how to plug your Rigol Real-Time Spectrum Analyzer (RSA) into your Mixed Signal Oscilloscope (MSO).
Eye diagram on Rigol MSO5000
Today I learned how to do an Eye Diagram on my scope: #1135 Eye diagram on Rigol MSO5000.
SPIDriver and I2CDriver
Zener diodes for temperature critical applications
“In a 5.6 V diode, the two effects occur together, and their temperature coefficients nearly cancel each other out, thus the 5.6 V diode is useful in temperature-critical applications.” — Zener diode.
The two effects referred to are the Zener effect and the Avalanche breakdown.
Transformerless Power Supplies
This is a very interesting read: Transformerless Power Supplies: Resistive and Capacitive. I was referred to it by @mariush over on the EEVblog forum.