Products > Test Equipment
ARRAY electronic loads
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Makerman69:
We've got 8 DC loads made by ARRAY in our lab. Plus  more than I can count of their programmable power supplies ( rebadged Circuit Specialists) No problems, they do what we need them to do and then some. Good build quality and terrific value. Can't ask for more. Some of the posts trash these because they are made in China . What isn't made in China? My understanding is that ARRAY is a Taiwan company and the engineering and quality are more on the upper end of made in China products.
dolomike:
How well do the Array/Re-branded loads handle a PWM source?

We'd like to test out PWM based control circuitry but need something that can handle 5-20kHz PWM signal.

Mike
forrestc:
Haven't ever put anything like that on mine, what type of wattage, voltage, frequency, filtering, etc. are you planning?

My guess is depending on the frequency it probably would work fine.  I know on mine (3711A) it seems to have a pretty good sized cap on the input---although I have noticed the ability to get it into oscillations where I have say a constant current source trying to drive it in constant power mode (I think that's the bad combination - if not, you get the idea).

-forrest
dolomike:
Well, we normally run DC motors in automotive and heavy duty applications so this isn't a lightweight system. I think we would normally run CC or CR mode for most tests but some could be upwards of 800W. I believe this can be achieved by paralleling the devices in CC or CR mode. Some re-brands state they can be paralleled but I didn't recall seeing anything in the Array manual about it.

Voltage: 12V/24V nominal but some tests can be at 28V.
Current: ~10-15A but some tests may require almost 30A
Wattage: Most tests are done at 12V so we could do most of it with ~400W but if the parallel combos work, then we can get up to the ~850W for the extreme tests.
PWM Frequency: 5kHz-20kHz
Filtering: What type of filtering are you asking about?

I guess a lot depends on the current slew rate but the manual states 1mA/us~4A/us on CCH mode which is quite a range so not sure what the driving factor will be.

The transient generator can handle up to 50kHz so I would expect it could handle a PWM source upwards of that frequency as well.

Thanks for the feedback.

Mike
nctnico:
I'm not quite sure a standard DC load will do what you want because the control loop will always lag behind and could mess with the control loop of the system you are testing. For this kind of tests I designed & build a switched resistor DC load myself. I can set it to a specific resistance and because its purely resistive it will keep that setting no matter what appears at the input.
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