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Rigol DP832 - Firmware list and bugs

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staze:
Rigol issued me an RMA to send my unit in. Thankfully, rather than shipping this beast, I'm going to be in the area of their office (Portland Oregon suburb) in the next month or two and they said I could just drop it off. =)

I'll post back when they've fixed it... and if I get any pictures of the Rigol NA offices. =)

SupraWez:

--- Quote from: alank2 on May 06, 2016, 09:18:43 pm ---Thanks for letting me know.  Just out of curiosity - is the firmware between the 832 and 832A the same or different?

--- End quote ---

According to this link it would appear the FW is the same for all DP units :-

http://int.rigol.com/Support/SoftDownload/3

Scottjd:
Hi Laurent, it looks like you are the creator of the cal script and I appreciate your work and sharing this.
I'm just got a new DP832 that is showing different reading and tolerates, it's said it was calibrated 6 months ago. So I plan to try your script since I have a 3 month old calibrated hp 34401A.
One of the factors for buying this was that I could see the current being used on my DUT without adding burden voltage inline.

So one fothe downfall of most bench meters is the high burden voltage when measuring current draw. I still need to learn more on SCPICOMMNADS and install the computer needed libraries So for calibrating the current side (I) I was wondering if you think it's possible that I could modify the script to read voltage for the current reading. What I'm looking at doing is getting the Agilent current shunt that shows 1mV per 1mA for more accurate measurements with the 34401A. So my thought was to modify the script to pull e mV measurements and apply the difference to the current calibration factors on the DP832.
What are the chances of this working after I do the needed research and learn more on this method of communication to my Equiptment? Are the needed command available for such a change to the script, or would I be waisting my time trying to get this to work?

After reading reviews I expected that even my new unit might be out of calibration to what I'm looking to use it for. So I'm happy to say your script was a big part of my decision in buying the DP832. I like the fact that I can have my 34401A calibrated and then use that to calibrate the DP832 without having to spend on getting a second device calibrated. I'm also banking in the age of the 34401A and that it's done drifting, I'll find out if that's true when I send it out in 8 months for my next yearly calibration and compare the data from the original calibration. If it has stopped drifting then a yearly cal may not be needed for someone like me who is just a hobbiest. If the 34401A starts disagreeing with my Fluke 289 then I will have to figure out what meter went off, but for now as long as they both agree within the tolerance expected then I can trust the meter to use for calibrating other Equiptment like the DP832 and save money not having to pay for calibrations.

Thanks,
Scott


--- Quote from: LaurentR on February 28, 2016, 03:18:51 pm ---Looks great (making me have Keithley envy)!

Note that for the "readings within 1mV", if you do a full sweep, you'll discover the DAC is a bit all over the place in some spots. See this thread for more background:
https://www.eevblog.com/forum/testgear/noob-dac-linearity-in-the-dp832/
So across the sweep, it's actually much closer to the quoted 10mV accuracy.

--- End quote ---

LaurentR:

--- Quote from: Scottjd on June 13, 2016, 03:18:16 am ---Hi Laurent, it looks like you are the creator of the cal script and I appreciate your work and sharing this.
I'm just got a new DP832 that is showing different reading and tolerates, it's said it was calibrated 6 months ago. So I plan to try your script since I have a 3 month old calibrated hp 34401A.
One of the factors for buying this was that I could see the current being used on my DUT without adding burden voltage inline.

So one fothe downfall of most bench meters is the high burden voltage when measuring current draw. I still need to learn more on SCPICOMMNADS and install the computer needed libraries So for calibrating the current side (I) I was wondering if you think it's possible that I could modify the script to read voltage for the current reading. What I'm looking at doing is getting the Agilent current shunt that shows 1mV per 1mA for more accurate measurements with the 34401A. So my thought was to modify the script to pull e mV measurements and apply the difference to the current calibration factors on the DP832.
What are the chances of this working after I do the needed research and learn more on this method of communication to my Equiptment? Are the needed command available for such a change to the script, or would I be waisting my time trying to get this to work?

After reading reviews I expected that even my new unit might be out of calibration to what I'm looking to use it for. So I'm happy to say your script was a big part of my decision in buying the DP832. I like the fact that I can have my 34401A calibrated and then use that to calibrate the DP832 without having to spend on getting a second device calibrated. I'm also banking in the age of the 34401A and that it's done drifting, I'll find out if that's true when I send it out in 8 months for my next yearly calibration and compare the data from the original calibration. If it has stopped drifting then a yearly cal may not be needed for someone like me who is just a hobbiest. If the 34401A starts disagreeing with my Fluke 289 then I will have to figure out what meter went off, but for now as long as they both agree within the tolerance expected then I can trust the meter to use for calibrating other Equiptment like the DP832 and save money not having to pay for calibrations.

Thanks,
Scott


--- Quote from: LaurentR on February 28, 2016, 03:18:51 pm ---Looks great (making me have Keithley envy)!

Note that for the "readings within 1mV", if you do a full sweep, you'll discover the DAC is a bit all over the place in some spots. See this thread for more background:
https://www.eevblog.com/forum/testgear/noob-dac-linearity-in-the-dp832/
So across the sweep, it's actually much closer to the quoted 10mV accuracy.

--- End quote ---

--- End quote ---

Scottjd, what you are trying to do is not complicated, and everything you'll need is already in the script, so you'll just need a bit of Matlab editing to get it to work.
* First, you should install Matlab, the Keysight IO Libraries and make sure you can run the script and go through the first IDN calls. I used to have a 34401A and the script ran on it in draft form. Note that I was using the serial port and had all kinds of issues with that setup.
* Second, the current script probably doesn't work out of the box on the 34401A anymore, but it should be easy to make it do so. You just have to recognize the 34401A IDN and skip the is34461A section, which uses 34461A-only commands (temperature, uptime... which are not critical to the test).
* Finally, for the 3.2A reading, you have to modify a bit of code. When you detect that the current step is >3A, do the voltage init and reading as done during the voltage stepping and do the math.

Note that at 3.2A, you are unlikely to blow the fuse and the 34401A should be able to measure it properly. I believe one of the users in this thread has done it.

I don't really have time to experiment at home, but I can try to help if you bump into any issue.

Laurent

Scottjd:
Thanks for the responce,

As for blowing a fuse with the > 3.2A current  measurement with the 34401A it won't be an issue if I'm using the more acurate current shut, hence the 34401A will be measuring mV, voltage and not amperage.
But yes, I've done short times of 3.2A current measurements with the 34401A, but this is were its the most inaccurate and can apply 2V of burden voltage, it's why I'm looking at using the shut in the voltage side instead for calibration and it more acurate over the 3.2A range.

I won't be using the serial cominication, I have a keysight GBIP to USB adapter so I shouldn't see these cominication errors.

Thanks for the heads up in these potential issues.
Scott


--- Quote from: LaurentR on June 13, 2016, 04:36:00 am ---
--- Quote from: Scottjd on June 13, 2016, 03:18:16 am ---Hi Laurent, it looks like you are the creator of the cal script and I appreciate your work and sharing this.
I'm just got a new DP832 that is showing different reading and tolerates, it's said it was calibrated 6 months ago. So I plan to try your script since I have a 3 month old calibrated hp 34401A.
One of the factors for buying this was that I could see the current being used on my DUT without adding burden voltage inline.

So one fothe downfall of most bench meters is the high burden voltage when measuring current draw. I still need to learn more on SCPICOMMNADS and install the computer needed libraries So for calibrating the current side (I) I was wondering if you think it's possible that I could modify the script to read voltage for the current reading. What I'm looking at doing is getting the Agilent current shunt that shows 1mV per 1mA for more accurate measurements with the 34401A. So my thought was to modify the script to pull e mV measurements and apply the difference to the current calibration factors on the DP832.
What are the chances of this working after I do the needed research and learn more on this method of communication to my Equiptment? Are the needed command available for such a change to the script, or would I be waisting my time trying to get this to work?

After reading reviews I expected that even my new unit might be out of calibration to what I'm looking to use it for. So I'm happy to say your script was a big part of my decision in buying the DP832. I like the fact that I can have my 34401A calibrated and then use that to calibrate the DP832 without having to spend on getting a second device calibrated. I'm also banking in the age of the 34401A and that it's done drifting, I'll find out if that's true when I send it out in 8 months for my next yearly calibration and compare the data from the original calibration. If it has stopped drifting then a yearly cal may not be needed for someone like me who is just a hobbiest. If the 34401A starts disagreeing with my Fluke 289 then I will have to figure out what meter went off, but for now as long as they both agree within the tolerance expected then I can trust the meter to use for calibrating other Equiptment like the DP832 and save money not having to pay for calibrations.

Thanks,
Scott


--- Quote from: LaurentR on February 28, 2016, 03:18:51 pm ---Looks great (making me have Keithley envy)!

Note that for the "readings within 1mV", if you do a full sweep, you'll discover the DAC is a bit all over the place in some spots. See this thread for more background:
https://www.eevblog.com/forum/testgear/noob-dac-linearity-in-the-dp832/
So across the sweep, it's actually much closer to the quoted 10mV accuracy.

--- End quote ---

--- End quote ---

Scottjd, what you are trying to do is not complicated, and everything you'll need is already in the script, so you'll just need a bit of Matlab editing to get it to work.
* First, you should install Matlab, the Keysight IO Libraries and make sure you can run the script and go through the first IDN calls. I used to have a 34401A and the script ran on it in draft form. Note that I was using the serial port and had all kinds of issues with that setup.
* Second, the current script probably doesn't work out of the box on the 34401A anymore, but it should be easy to make it do so. You just have to recognize the 34401A IDN and skip the is34461A section, which uses 34461A-only commands (temperature, uptime... which are not critical to the test).
* Finally, for the 3.2A reading, you have to modify a bit of code. When you detect that the current step is >3A, do the voltage init and reading as done during the voltage stepping and do the math.

Note that at 3.2A, you are unlikely to blow the fuse and the 34401A should be able to measure it properly. I believe one of the users in this thread has done it.

I don't really have time to experiment at home, but I can try to help if you bump into any issue.

Laurent

--- End quote ---

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