| Products > Test Equipment |
| E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A) |
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| apblog:
--- Quote from: sdouble on June 03, 2018, 10:10:40 pm ---I guess that the E36312A is also affected by that issue, right ? --- End quote --- Looks like it. Here are the service notes for the E36311A and E36312A: http://literature.cdn.keysight.com/litweb/pdf/E36311A-01.pdf http://literature.cdn.keysight.com/litweb/pdf/E36312A-01.pdf |
| apblog:
So, I just wanted to post an update. My new E36313A is here, and it's great, I love it. :-+ It's hard to get excited about a nice power supply, but it's a lot like having a good vise -- it's boring but it makes everything else easier. They've mostly, but not entirely, fixed the voltage spike that occurs when you plug it in. It still has a +/- 1.5 volt (max) glitch when you plug it in. But it's only nanoseconds long instead of milliseconds as some people were reporting previously. Little enough energy and low enough voltage to totally not be a problem for me. Also I'm not seeing any sign of the UI bugs that people were reporting. There are two features though that I would really like to have. 1. The ability to turn on/off the outputs simultaneously by pressing two buttons at once. It turns out if you press two buttons at once it doesn't recognize either of them. It does beep though, just to taunt you. ;) 2. The abiliity to run the logging chart in continuous mode, so you can just keep it running and kind of keep an eye on it or look at it really quick if your board does something odd. I love the high-res (1 mA) current readout. :-+ It's great for keeping an eye on power consumption as I bring up the various peripherals on the board. |
| adamgreig:
I emailed Keysight UK about the service note and they agreed to handle it under warranty :). They collected my E36312s and replaced them with new/refurb units with new serial numbers. Took about 2 weeks from collection to getting new ones, posted from Germany. Annoyingly they didn't post them in the original packaging, just in a box with some expanding foam bags, so while they were well packed it's a real pain to repack and the box won't hold the cardboard accessories box any more :( I suggest sending yours in disposable boxes rather than the originals! Anyway the power-up transient is hugely improved; I see about 6Vpp for 200ns or so into a 2R load, and roughly similar into 50R. With no load there's a bunch more high frequency ringing (around 30MHz?) but still only for a couple hundred nanoseconds. So that's still 2W into my load but only 0.4µJ... probably ok! Before we were getting DC 8V for 300ms so this is a lot better. Some scope captures: https://imgur.com/a/ucG1sRv Internally the power PCBs are all the same revision, 005 for the mains /1ch PCB and 003 for the top board (other two channels), I couldn't check the front board but it looks identical too, so maybe the fix is a greenwire or component change rather than a new PCB. Not sure. Standby power is still 11W, and barely goes up to 12.5W when turned on. Can't win everything! |
| LaurentR:
--- Quote from: adamgreig on June 27, 2018, 10:21:12 pm ---I emailed Keysight UK about the service note and they agreed to handle it under warranty :). They collected my E36312s and replaced them with new/refurb units with new serial numbers. Took about 2 weeks from collection to getting new ones, posted from Germany. --- End quote --- I sent mine in to Santa Rosa (I am in the US) last week, and much to my surprise, the unit was sent to Germany with a message "Received on 06/21/2018. In progress (Expected completion on 07/24/2018) Service performed by Boeblingen Germany Hub". Since I thought this was going to be a quick exchange, I asked what was happening and got this: "This does need to go overseas to be evaluated first then we will supply the refurbished unit." |
| adamgreig:
--- Quote from: LaurentR on June 27, 2018, 10:40:47 pm ---Since I thought this was going to be a quick exchange, I asked what was happening and got this: "This does need to go overseas to be evaluated first then we will supply the refurbished unit." --- End quote --- I wonder what they need to evaluate, given it's their service note saying all units are affected! Mine was estimated completion 29th June but actually got posted on the 25th. |
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