Author Topic: Preparing EEZ H24005 for crowdfunding  (Read 45939 times)

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Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #25 on: January 09, 2017, 07:09:21 am »
First need few more to build ;) All three are currently busy
 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #26 on: January 09, 2017, 08:35:52 am »
a stupid question here.
Does the spacing between banana plugs match the standart spacing of banana to BNC adapters ?
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #27 on: January 09, 2017, 08:49:25 am »
Yes, 0.75" or 19.05 mm
 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #28 on: January 09, 2017, 08:57:06 am »
how long would it take to assemble the full beast ?
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #29 on: January 09, 2017, 08:59:01 am »
If you are get Complete Kit it shouldn't take longer then couple of hours.

EDIT: I forgot to mention that we are probably include Arduino board already mounted on the front panel. That actually takes most of the time.
« Last Edit: January 09, 2017, 09:00:52 am by prasimix »
 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #30 on: January 09, 2017, 09:04:48 am »
will you provide a detailed manual to perform the assembly ?
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #31 on: January 09, 2017, 09:05:41 am »
Of course, and going to make some videos, too.
 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #32 on: January 09, 2017, 09:11:39 am »
do you think that such a product could run 24 hours / 7 days for weeks without interuption ?
I'm asking because I got really disappointed by the Rigol DP832 which turns off every two  days roughly.
Unacceptable for my needs.
 

Offline Skimask

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #33 on: January 09, 2017, 09:12:52 am »
$400?
And I get to put it together myself?
I didn't take it apart.
I turned it on.

The only stupid question is, well, most of them...

Save a fuse...Blow an electrician.
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #34 on: January 09, 2017, 09:21:59 am »
do you think that such a product could run 24 hours / 7 days for weeks without interuption ?
I'm asking because I got really disappointed by the Rigol DP832 which turns off every two  days roughly.
Unacceptable for my needs.

Unit that I have on the table is now approaching 100 working days, but unfortunately cannot have a chance to run it for longer period because we are continuously doing something on firmware side (each upload require restart). But, in a time what two unit was here (before I sent one to CrowdSupply) one was working more then a 10 days in the row without any problem. Here is a screenshot.
 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #35 on: January 09, 2017, 04:58:32 pm »
did you try to monitor the temp under strong load ?
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #36 on: January 09, 2017, 05:33:47 pm »
Firmware is continuously monitoring temperature on the three point: 2 x Power board (near pre-regulator's power mosfet) and 1 x above AC/DC modules. Measured temperatures can be acquired remotely via SCPI command (MEAS:TEMP), and they are displayed on TFT display. Power board sensors values are used to control cooling fan speed. under continuous max. load temperature on that sensors cannot exceed 70oC. Temperature about AC/DC modules cannot exceed 45oC. Of course we have three independent OTP (over-temperature protection) that can switch off output of single channel, both channels or shutdown complete unit.
Also if any of temp sensor failed or colling fan failed, max. output current will be automatically limited to the lower max. current (2 A).
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #37 on: January 09, 2017, 06:32:00 pm »
What I can measure after about half an hour of operation with both channels delivering max current (5 A) and ambient temperature is 21oC:
  • Channel sensor temperature (CH1, CH2): 61 oC
  • "Interior" sensor, above AC/DC modules temperature (AUX): 32.5 oC
  • Fan speed: 4300 rpm
 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #38 on: January 10, 2017, 06:40:34 am »
that's pretty reasonnable. 8)
 

Offline jleg

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #39 on: January 11, 2017, 12:49:49 am »
This really is an awesome piece of hardware, imo  :-+ - and i'm on the point of considering to get a kit.
But i feel a bit concerned about the fact that this "european" project will be shipped form the the U.S. - and i probably have to deal with customs then?
Any chance that there'll be an EU source later as well?
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #40 on: January 11, 2017, 12:53:49 am »
Hard to say in this moment. I'm sorry for that and to "encourage" you I can only say that to this moment 11.9% backers comes from Germany or 35.8% in total from EU.
 

Offline peteb2

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #41 on: January 11, 2017, 10:39:22 pm »
You have my Pledge for one full kit...  :-+   After spending a day studying all the work you guys have put into this thing it really looks like it'll serve users well... It's the flexibility i like so much that's a winner in my eyes.

I have spent a lifetime building so many hobby-time bench power supply designs featured in the hobby magazines over the past 3 decades and they always worked but only to a point and i usually found out that fact right at the most inconvenient time. Then the thing was just not able to meet a specific demand and i'd be on the search again.

And of course it's recently become tempting to take a chance at one of the Professional 'faulty' Lab Supplies being sold on ebay and i admit i have been eyeing a few but the shipping costs to New Zealand just killed that idea...

So, to Prasmix and the team behind this thing. All the best on the Crowdfunding...  :)

 
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Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #42 on: January 15, 2017, 07:55:54 pm »
A small update: we are almost there, it's great to see how people around the world could be gathered to support an idea. Currently we have backers from 23 countries, and not surprisingly none from the China, and surprisingly (not?) none from Italy :). I'm wondering does the latest in connection with the fact that Italy is a home of Arduino? Maybe some people in general is discouraged with anything in connection with Arduino, but note that we are using 32-bit Due and we makes it busy with displaying everything with high refresh rate on 320x240 screen while doing many "housekeeping" stuff and is still responsive for SCPI remote programming via USB and Ethernet port concurrently! And that is not just our guesstimate but reality that could be checked on growing collection of videos (still without background music, and me as narrator with bad English ;)).

I also discussed with manufacturers what could be effect on cost and delivery if we add encoder for people who still believe that neither of three input modes could rivaled turning a knob. So we could possibly offer it as an option to not unnecessary increase the cost for the people how is ready to live with touchscreen alone.

I was also thinking about dual range current programming/measurement e.g. to add 0-500 mA what some people suggested. That would need an intervention on Power boards, and it's doable since we have enough space to grow PCB width to accompany such modification. But that is more candidate to first stretch goal that all backers got it.

Your valuable inputs is highly welcomed, and thanks once again to all backers, hopefully we reach 100% to the end of the campaign.
 

Offline cs.dk

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #43 on: January 15, 2017, 10:04:54 pm »
I'm definitely up for one - Looks like a really good job. :-+
 
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Offline Strada916

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #44 on: January 15, 2017, 10:22:52 pm »
even though i already purchased a pcb board kit prior to campaign. I have also supported this campaign with the all included option. Thank you for a great job.

Sent from my SM-G925I using Tapatalk

The Bone, the Off-White, the Ivory or the Beige?
 
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Offline jleg

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #45 on: January 16, 2017, 03:08:51 am »
Hard to say in this moment. I'm sorry for that and to "encourage" you I can only say that to this moment 11.9% backers comes from Germany or 35.8% in total from EU.

ok ok, count me in, just pledged the kit!  ;)

btw, i'd also support having additional encoders - it would make the psu more complete, and also allow for having greasy fingers sometimes...  ::)
 
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Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #46 on: January 16, 2017, 03:52:12 am »
my only concern is the noise level.
Could you show  scope pics at 5 V output , 50 ohms load, 10 us/div and 200 ns/div ?
at least 50 MHz scope BW ? 2mV /div if possible.
 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #47 on: January 16, 2017, 04:27:21 am »
my only concern is the noise level.
Could you show scope pics at 5 V output , 50 ohms load, 10 us/div and 200 ns/div ?
at least 50 MHz scope BW ? 2mV /div if possible.

This is a reference noise (Rigol MSO1074), probe is coax cable with 4u7 capacitor, 50R termination on the scope end:



This is a CH1 with an additional Cout of 22 uF Vout=5V and load=47R (CV mode, I=110mA):



It's possible that most of the noise visible here comes from near TFT display and Arduino Due board.
Another one with max. current of 5A (load =~1R, Vout=5.8V) it looks like this:





 

Offline prasimix

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #48 on: January 16, 2017, 05:05:21 am »
Please find below a load transient response measure with Vout=18V, Istep=1 to 2A (f=1kHz) with additional Cout=100uF+22uF. I'm using home made closed loop load transient tester presented in LTC's AN104.

 

Online sdouble

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Re: Preparing EEZ H24005 for crowdfunding
« Reply #49 on: January 16, 2017, 07:29:40 am »
could you show the high frequency noise ?
 


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