(...)
Forget about sense or no sense, I'm talking about the basic DC accuracy display of the power supply, which someone complained was not very good on the Rigol. I was just showing that it's no better on the Agilent.
Am I missing something here?
Am I missing something here?
Annually over 12 months, 25+/-5C, Agilent E3631A:
Programming:
+6V: Voltage 0.1% + 5mV, Current 0.2% + 10mA
+25V: Voltage 0.05% + 20mV, Current 0.15% + 4mA
-25V: Voltage 0.05% + 20mV, Current 0.15% + 4mA
Readback:
+6V: Voltage 0.1% + 5mV, Current 0.2% + 10mA
+25V: Voltage 0.05% + 10mV, Current 0.15% + 4mA
-25V: Voltage 0.05% + 10mV, Current 0.15% + 4mA
----
Annually over 12 months, 25+/-5C, Rigol DP832/A:
Programming:
+5V: Voltage 0.1% + 5mV, Current 0.2% + 5mA
+30V: Voltage 0.05% +20mV10mV, Current 0.2% +5mA10mA
-30: Voltage 0.05% +20mV10mV, Current 0.2% +5mA10mA
Readback:
+5V: Voltage 0.1% + 5mV, Current 0.15% + 5mA
+30V: Voltage 0.05% +10mV5mV, Current 0.15% + 5mA
-30V: Voltage 0.05% +10mV5mV, Current 0.15% + 5mA
So, in ascending order (from #3/third most important to #1/most important), we get:
3. New displays and user interfaces are on the way - we should find a way to embrace and continually improve them.
2. More important than the display/UI (which is very important) is signal aquisition and processing integrity.
1. More important than 1 or 2 is that test equipment should do no harm to a responsible user or the user's DUT.
Looks like it is a fault by design, see https://www.eevblog.com/forum/blog/eevblog-509-rigol-832-lab-power-supply/msg278118/#msg278118 Has anyone asked Rigol about it, if they don't watch Dave's channel, and if they know a quick fix for it?
The local rep has said he'll get Rigol to take a look at it. These Chinese companies cannot access youtube etc.
Displaying the values for all channels at the same time.
Would tend to agree with that. Anything else?
Haven't done anything with it, or anything else, I've been very sick for a week now.
The numeric keypad should be a standard layout. CC mode should be signalled with dedicated LEDs or a different color on the channel on/off button back light. The binding posts should be arranged that the two independent channels can be connect to a symmetrical supply with a standard 19mm shorting bar.
I think, with all the knowldege and experience of the members of this forum we should design an eevblog lab PSU. Lab PSUs are a hot topic for everyone, for beginners up to professional EEs and T&M junkies :-)
Dave did this already, interesting video about the schematic:
Am I missing something here?
Yes, the price difference.
Yes... correct specs as edited in purple I only checked the Rigol specs
I have double checked my numbers. Won't rule out I have overlooked something, but it seems there may be more than one set of Rigol's specs in circulation then. My numbers for the E3631A is from page 16 of the service manual, dated April 2000. The DP832/A specs I used is from page 4 of the the DP800 datasheet file downloaded yesterday from rigol.com. The file is named DP800_DataSheet_EN.pdf, dated August 2013 (date on bottom of last page).
PS and just to mess with the heads of some of the contributors to this thread: I am rather seriously thinking about buying a DS2072 for my home lab. Just because I am critical of a manufacturer, it doesn't follow I see the world in Black and Whlte.
Not trying to be a jerk but I checked that pdf and the corrected numbers I posted are what are on that pdf.
You don't need glasses but I looked in 4 places from the site and they all have the numbers I posted.(...)
I think you may be looking at the DP831 specs on page 105 instead of the DP832 specs on page 107.
I got way too many things on my plate to sit around and debate what I said because it's just a fact. In the old days aka the 1980s and before, people used their Brains and minimal equipment because real lab equipment was for corporations or the super rich engineers (an Oxymoron). Today most of you guys just sit around just playing with the equipment and checking out features and Bling and have no idea how to Fix anything or design anything unless as some one said before you can feed it into a ADC and work with it in software. Unfortunately Daves Video reviews just keep stroking this passion and really don't help any of you to get more into electronics itself but instead turn you guys into equipment aficionados.
Some people like test equipment, what's the problem with that?
If you don't care about test equipment, you don't have to watch the test equipment videos, nor read the threads that are specifically about test equipment.
If you have nothing useful to contribute to this test equipment thread, then why are you here complaining? Why waste your time?
I got way too many things on my plate to sit around and debate what I said because it's just a fact. In the old days aka the 1980s and before, people used their Brains and minimal equipment because real lab equipment was for corporations or the super rich engineers (an Oxymoron). Today most of you guys just sit around just playing with the equipment and checking out features and Bling and have no idea how to Fix anything or design anything unless as some one said before you can feed it into a ADC and work with it in software. Unfortunately Daves Video reviews just keep stroking this passion and really don't help any of you to get more into electronics itself but instead turn you guys into equipment aficionados.
Some people like test equipment, what's the problem with that?
If you don't care about test equipment, you don't have to watch the test equipment videos, nor read the threads that are specifically about test equipment.
If you have nothing useful to contribute to this test equipment thread, then why are you here complaining? Why waste your time?
We all like Test equipment Dave thats not the point! May I ask you what is the point of someone owning $20,000 worth of test gear if all they are doing with it is running 555 timers and basic Op-Amps? Thats the bloody problem with all of this and below I will qoute what I consider a classic post in this thread that sums it up completely.
I have to say that the mentioned Agilent E3631A is a perfect example for what I call eye-cancer gear. In 2013 offerinbg a product in this price range with such an atrocious display is in my opinion a crime. In the 21st century a good multi-color high-res display and some nice layout & software design is not too much to ask for.
But also the Rigol is in some aspects more of a they-tried-but-failed product in terms of usability: true, the monochrome themes are not so bad really, at least well readable, but what is the point in having a multi-color display, if you just use one color in various brightness? I think these themes should be upgraded with some colors for warnings and and some additional info (e.g. current/voltage limit reached), and in addition they should design some "modern" ui elements that take full usage of state-of-the-art fonts and gui design. Clearly in the sister product DP832A they tried to do that, but ultimately failed, because the three display sections for the outputs are not really have-a-quick-look friendly. And they I don't even want to mention the completely botched numeric keys and rotary knob. Whoever came up with that should be sentenced to having to use such a keypad for the rest of his life.
All in all I think it's very refreshing for the market when new and feature-rich products get released by companies such as Rigol which now clearly have evolved from the entry/hobbyist segment into the (semi-)professional region. Many of the older professional big players have just kind of slept for the last 20/30 years when it comes to product design and usability. Today everything is basically done in software (and this often better than any hardware could ever do), so I think the customers have a right to demand products which utilize their capabilities to the full extend.
What's wrong with someone being into test gear? I am into watches. I have about 60 watches. I just like them. Old, new, mechanical, automatic, eco, digital, cheap, expensive, plastic, metal, ones I made myself, ones I had made, ones I got at yard sales, and everything in between. Why should people not indulge their desires if they have the means and desire to do so? Are people neglecting to feed their kids because they want that new DSO?