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Rigol DP832 remote command update rate????..............
JDubU:
The DP832 spec sheet lists the "Command Processing Time" as: <118ms (The maximum time required for the output to change accordingly after receiving the APPLy and SOURce commands).
http://beyondmeasure.rigoltech.com/acton/attachment/1579/f-01c1/1/-/-/-/-/DP800%20Datasheet.pdf
Smokey:
--- Quote from: lundmar on October 13, 2017, 06:40:09 am ---Yeah, it's a real shame. I don't think I have seen any DC power supplies with quick update rate and very fast LXI response.
I wish I could find an open source hardware DC power supply with a proper internal data logger with a big memory buffer supporting up to 1kHz precision sampling rate of voltage/current that can last for at least 30 minutes and then be able to read it out via LXI. Oh, and it needs to be compact and fanless so it fits perfectly on the desk or lab of every engineer and hacker out there. If only such a project existed.. :)
--- End quote ---
That's what I'm talking about!
Ya I realize I'm trying to approximate an SMU. I don't need nearly the precision of a real SMU though.
I call shenanigans on the DP832 not being able to measure fast enough. The internal protection does not take 0.5 sec to detect a limit condition. It's measuring fast, but not giving me access to the measurements faster than 2 per sec.
I thought about the scope data capture, but that's only 8bit resolution for the data which unfortunately is lower than I need. The measurement on the DP832 is much better than that.
alm:
I find it ironic that people expect a DC power supply to sample quickly. If it is truly a DC signal, you only need to sample it once ;).
There are some high-speed power supplies like Keithley 230x and HP/Agilent/Keysight 663xx that can sample at least the current up to a few kS/s or so. Carefully examine their datasheets to learn specifics and limitations (some modes need to be triggered, for example). I imagine the Rigol designers did not consider sampling a signal with a few mF of output capacitance across it at a high sampling rate very useful. High-speed power supplies (and SMUs) will have a very low output capacitance with the associated higher noise, decreased stability and increased complexity.
If you want to sample the signal faster, connect a DMM across the power supply. A decent bench DMM should be sample up to 1 kS/s or so with decent resolution. That is what people used to do before SMUs and power supplies with advanced measurement functions were available. Or you could try the resolution from your scope by oversampling and averaging multiple sweeps.
If you want to make the sourcing part faster without buying a $$$ SMU, you could look into combined power supply / amplifiers like KEPCO BOP, Lambda BOSS and HP 682xA and drive them from a function generator. They will not give you any high-speed measurements, so you would still need one or two external DMMs to sample the output. SMUs were designed to combine those functions into one instrument, and speed up the source-measure cycle through integration.
You could also look into those 'toy SMUs' like the Analog Devices ADALM1000.
Smokey:
Resurrecting this old thread. Got an ad from Rigol for the new DP2000 series. Check out the specs on programmability and response times (pg 7)....
https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-531346d9-45a9-40b2-9b3e-e9120b59e01d/1/-/-/-/-/DP2000_DataSheet_en.pdf
This both confirms all the stuff we were speculating about the DP800 series, and more interestingly has specs that make all the desired functionality possible on new DP2000 series (and some of it with the existing DP900 series too).
10ms Command processing time and 1ms dwell opens a lot of doors for interesting scripted experiments here.
alm:
The power supply does not have an active down-programmer, so the actual voltage programming times, especially going from 100% down to 0 V with no load are a lot less impressive:
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