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New entry-level R&S NGE100 Power Supply Series

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Octane:
Hi,

I did a quick test with the scope: 20V output voltage, current limit set to 50mA. Putting a 330R resistor across the output and capturing the resulting voltage with the scope. That outcome can be seen in the image attached below. Pretty pathetic. The voltage stays at the 20V when the resistor is connected (around 60mA, remember 50mA limit is set) and then drops a little bit after ~150ms staying at one level for about 600ms before it drops to the 50mA it is set to. So from connecting the load to reaching the set current it "only" took about 1s. Pretty bad.

Now a few videos:

https://youtu.be/CVJEZAvv9l4
In this video I short the output with the amp range on the multimeter. Voltage set to 20V, current limit of 50mA. As soon as I connect the meter, the voltage drops to 0 volts and it takes about a second to rise up to the current limit of 50mA. You also see the current display wildly fluctuating until it sets to the 50mA, whereas the meter shows the 50mA as soon as the output rises.

https://youtu.be/VKatT8dCHn0
Here I have a current limit of 50mA with an output voltage of 12V. Again connecting the amp meter across the output. Same delay as before, but now it also supplies almost 80mA and is steady but slowly dropping. So again, total fail.

https://youtu.be/cyDhJy3BPSc
Now I'm using the 330R resistor again. Voltage set point is 12V, current limit is 30mA. When I connect the load 37mA are supplied without ever limiting to 30mA.

https://youtu.be/KFM-quOGaLY
Same settings as in video before. Shorting with amp meter. Now it supplies 60mA on a set point of 30mA.

Ok, so I registered for a youtube account only to be able to post those videos here, so please let me know if they don't work, or any other thing is wrong.
I think with this testing, the fate of the supply is sealed. It will go back and I will be looking for another brand.
About US$1000 is ridiculous for this supply, I only would pay the premium if I would have gotten R&S quality.

Anyways, hope this is informative.

Michael
 
Edit: Grammar...

colorado.rob:
What's it cost to enable the Ethernet port on one of the NGE103?  I'm looking for a 2-3 channel LAN/LXI benchtop supply under $1000.  This seemed to fit the bill until I noticed it had "optional ethernet".  I'm guessing that'll put it out of the running and close to the price of the HMC8043.

Octane:
On Testequity it is US$150. So yeah, the HMC might be a better deal. In hindsight I don't really understand why they have the NGE103. The HMC8043 seems to have better specs and more standard features for essentially the same price.

Michael

Hensingler:
Think I would rather pay 20% more for this much more capable PSU

http://uk.farnell.com/aim-tti-instruments/mx100tp/power-supply-3ch-70v-6a-programmable/dp/2457410

315W, 16v/6A through 70v/3A, remote sense, earth terminal, keypad, all remote options standard, and really nice binding posts with integral 4mm safety sockets.

colorado.rob:

--- Quote from: Hensingler on May 08, 2017, 04:43:02 pm ---Think I would rather pay 20% more for this much more capable PSU

http://uk.farnell.com/aim-tti-instruments/mx100tp/power-supply-3ch-70v-6a-programmable/dp/2457410

315W, 16v/6A through 70v/3A, remote sense, earth terminal, keypad, all remote options standard, and really nice binding posts with integral 4mm safety sockets.

--- End quote ---

Nice recommendation!  I just pulled the trigger on that puppy.  Saelig are having a sale on these units and with the EEVBLOG discount, it was just a hair above my budget.  It seemed well worth the stretch.  I really like the sense ports in the front, even if some find them hard to use.

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