Inside a Two-Quadrant Power Supply - Agilent 66312A Teardown and Experiment

[@jeremytravis360]

I love the clarity of your explanations. Many thanks.

[@KerryWongBlog]

You are welcome!

[@NikolayTach]

Thank you for the upload wonder if you can add protected memory on Dual Interface IC so that is can do multiple IR sequencing probably not.

[@SparrowHawkPilot]

Could you do a short video on the calibrations of the 66321A, please?

[@PapasDino]

Thanks for the rundown Kerry!

[@KerryWongBlog]

Thanks for watching. Hope you enjoyed it!

[@easfbrasil]

Very good video. Can you clarify a dummy doubt? If I set the power supply 5v and 20mA and I connect a LED on the output without any resistor, will the power supply limit the 20mA and move the voltage down and will not burn the LED? If a put a Li-On battery to load 3.7V that specs says load 4.2v 1700mA, will the power at the begin have 1700mA, but as reach 4.2v will start decreasing the A to near 0? Thanks in advance

[@KerryWongBlog]

1. if you set the output to 5V and limit the current to 20mA, the output voltage will drop to whatever value so that the maximum output current remains 20mA. So correct LED will not burn (if it is rated for 20mA, for small LEDs, 5mA is plenty). 2. Yes you can use the power supply as a charger exactly as you suggested. One thing I would watch out is, make sure that the set voltage of your power supply is higher than the battery voltage. For this specific power supply if the set voltage is lower it will discharge the battery, but for other power supplies, depending on the design, it could cause damage to the power supply if the connected load voltage is higher than the output.

[@DextersTechLab]

Interesting unit, there are a lot of similarities to my 6632B PSUs, which can also sink as much as they supply

[@KerryWongBlog]

The only difference between 6632B and 66312A according to the spec sheet is that 66312A has dynamic measurement capabilities but otherwise I think the two are pretty much identical.

[@DextersTechLab]

interesting, though the 6632B is twice as wide as your 66312A, maybe the 6632 was expected to be rack mounted?

[@PelDaddy]

Nice unit. Thanks for sharing, Kerry.

[@KerryWongBlog]

Thanks. You are welcome.

[@thephlophers]

I wonder how fast the CC regulation is on this unit. On the 66332A (the same family, but 5A) it's remarkably slow, taking tens to hundreds of milliseconds to switch to CC mode after connecting a load.

[@inductorbackemf7204]

Hi Kerry thanks for the video really nice way of speaking almost relaxing (in a good way)have a good day! Alex.

[@KerryWongBlog]

Thanks Alex!

[@yiannisbrokos5267]

Thanks for making all these videos. Can I use a part of your videos (3-5)min with your voice and a link to your KZbin video in order to make a reference in my KZbin video in an Agilent 6612C troubleshooting and reverse engineering?

[@KerryWongBlog]

Hi Yiannis. You can embed portions of the video and/or link to my video as long as you leave a reference. Thanks for asking!

[@glenslick2774]

You forgot to mention just how big and heavy the transformer is. I have some very similar 66309D supplies from the same family. The manual says the supplies weigh 20 pounds. The majority of that weight is probably in the transformer. The measurement buffer size is 4K, with a sample interval of 15us to 32s. That can be used to capture some detailed current waveforms from a system under test.

[@KerryWongBlog]

Yep.it's very heavy indeed.

[@fpvart193]

on kzbin.info/www/bejne/n3PUpoCEg8epeqs Ammeter shows -0,0007A. How can this be set to zero?

[@mikesradiorepair]

LOL, looks like the dust bunnies were busy reproducing inside that poor power supply. I have disassembled a lot of old lab type supplies before and I have to say I think that is the dirtiest I have ever seen.

[@KerryWongBlog]

Yeah, I was actually quite surprised to find out how dirty it was. Usually, this kind of equipment operates in a pretty clean environment even with extended use it would rarely become this dusty.

[@phasorsystems6873]

Tired of your EE TA? Look up androidcircuitsolver on google!

www.eevblog.com/forum/chat/inside-a-two-quadrant-power-supply-agilent-66312a-teardown/