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E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A)

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anotherlin:

--- Quote from: colorado.rob on June 15, 2017, 06:35:47 pm ---What good does having 1µA readback resolution do you when the level of accuracy quoted is 2-3 orders of magnitude greater?  Specs show 0.04% +3 mA and 0.25% +80 uA readback accuracy.

--- End quote ---

Specification states that error is (+/-0.04% of the output current) + (+/- 3mA of offset).
If you take a 1mA output current, error is 0.04% of 1mA, which is 0.0004mA (0.4uA), with an offset +/- 3mA.
So according to spec, the actual result can be with within [1 - 3.0004, 1 + 3.00004] mA.

However, most DMM quotes the offset as a % of the range of measurement.
For example my Agilent U3606 5.5 digit DMM, for the lowest 10.000 mA range, specifiies 0.05% of the reading + 0.015% of range.
My 5.5  DMM would be accurate within +/- 2uA if measuring a 1mA current. So its last 1uA digit would not be completely random.

I would rather think that the specified 3mA offset is the most pessimistic value using the highest measurement range of the readback circuit of the PSU.
And that actual performance may be much better, sufficiently that the last 2 uA digits are not completely random when the output current is <= 1mA.

Also the offset/range error is supposed to account for the overall noise of the measurement /readback circuit and this is supposed to be somewhat constant for the design.
So if you do a long log of measurements, you should be able to "null out" that offset error.

gslick:

--- Quote from: kilobyte on June 15, 2017, 10:58:31 am ---According to a picture in the Service Manual they use a STM32F4. This explains the fast startup time of round about 5 seconds in the video from Keysight.
There is already a firmware update available on the website. No wonder to see a USB DFU Updater.
And after a quick look in the Firmware file I think I found some text that belongs to an easter egg :D

--- End quote ---

Looking at some of the text strings in the CumuloNimbus_1_0_4_FP_1_0_0_Main_1_04.dfu firmware file it appears that it might be running uC/OS-II.
"uC/OS-II Idle"
"uC/OS-II Stat"
"uC/OS-II Tmr"
"uC/OS-II TmrLock"
"uC/OS-II TmrSignal"

Easter egg text?
"Doe, a deer, a female deer
Ray, a drop of golden sun
Me, a name, I call myself
Far, a long, long way to run
Sew, a needle pulling thread
La, a note to follow So
Tea, a drink with jam and bread"


Muxr:
They look interesting, although I personally would definitely go for the LAN option so E35312A would be it at a minimum.

Dubbie:
It's like Keysight was listening when I wrote my post a while back about "Why does no-one make a decent power supply"

I have been on the brink of getting a TTi, But I think I will get the E35312A instead.

The low current feature is great!

nctnico:

--- Quote from: Dubbie on June 18, 2017, 04:33:48 am ---It's like Keysight was listening when I wrote my post a while back about "Why does no-one make a decent power supply"

I have been on the brink of getting a TTi, But I think I will get the E35312A instead.

The low current feature is great!

--- End quote ---
The low current measurement feature is addictive. I already have an Agilent 66311B PSU which also has a low current measurement feature and it is excellent for low power electronics. I was already looking for a PSU with a high resolution current display but the low current measurement feature is way better.

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