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Products => Test Equipment => Topic started by: bsodmike on February 05, 2021, 12:09:35 pm

Title: ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W)
Post by: bsodmike on February 05, 2021, 12:09:35 pm

Hi all,

I'm doing some testing with an inverter that runs at 40A and I wanted to have OCP/OVP protection and logging.  This is a really quality bench PSU (having watched Dave's videos).  I would rather have these protection features than have to rely on Chinese MeanWell type chepo-PSUs and "rely" on their unverified protective circuitry.

Just thought it wouldn't hurt to check here on any feedback anyone might have.

https://export.farnell.com/rohde-schwarz/ngp804/power-supply-bench-4ch-32v-20a/dp/3287708

Thanks again!

Cheers M.

Title: Re: ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W)
Post by: Fred27 on February 05, 2021, 12:49:43 pm

There were a couple of reviews of the NGP814 over on Element14 recently. https://www.element14.com/community/roadTests/2208/l/rs-ngp814-power-supply (https://www.element14.com/community/roadTests/2208/l/rs-ngp814-power-supply)

Title: Re: ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W)
Post by: bsodmike on February 05, 2021, 01:57:56 pm

The NGP814 is more suited if you wanted a higher voltage output (serially, max 250Vdc).

Whereas the NGP804 can provide the max 80A which is handy for PSU designers etc those playing with DC loads etc etc.

Another use I will have with the NGP804, serially connecting each 32Vdc PSUx4 = 128V @ 6.25A (staying within the 800W budget), may allow testing a few Nixies here and there :)

Title: Re: ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W)
Post by: bsodmike on February 06, 2021, 11:44:19 am

Do you think I should go for the NGP814 instead?

I would imagine that only the matching pair of channels can be run in parallel, i.e. 20Ax2 @ 10Vdc (400W) and 10Ax2 @ 20Vdc (400W).  So 40A @ 10VDC is the max one can get from this at any time.

Alternatively, I suppose one could run Chan 2/3 at 10VDC and get 10x2 + the 40A from Chan 1/2, hence 60A out? Datasheet mentions 40A is max for NGP814.

Title: Re: ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W)
Post by: Fred27 on February 06, 2021, 11:55:44 am

I just mentioned it as it was a review of a PSU from the same series. I wasn't implying that the NGP814 was better suited to your needs that the NGP804.

Title: Re: ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W)
Post by: bsodmike on February 07, 2021, 06:44:27 am

Hey Fred,

Well here's something interesting, I found this from Keysight.
https://export.farnell.com/keysight-technologies/e36233a/power-supply-bench-2ch-30v-20a/dp/3052301

Max output is 20A at 30Vdc with two internal PSUs at 200W each; so the total parallel output is 40A.
One convenience feature is that the parallel mode can be enabled from the menu rather than having to manually wire the two "internal" PSUs together.

Another great selling point is that this unit is an entire £1,000 cheaper than the R&S unit.