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Rigol DP832 - Firmware list and bugs

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Howardlong:

--- Quote from: OldNeurons on June 11, 2015, 09:48:36 pm ---
--- Quote from: Howardlong on June 11, 2015, 08:51:34 pm ---Would someone kindly point me to where I can download 1.14 firmware from please? I have an OCP problem on my unit I'd like to remedy.

Many thanks!

--- End quote ---
PM sent with link to firmware 1.14.

--- End quote ---

Thank you!

I am delighted to report that the OCP problems I encountered (documented here https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg628640/#msg628640) are now a thing of the past! I was concerned that when I replaced a MOSFET in the unit a few weeks ago I'd broken something, but thankfully it appears not.

One thing to note was that the bootloader part of the firmware update seemed to just hang, so I went straight to the main update and analog board updates, it appears to have worked.

Thanks again.

cidak:
To all owners of DP8xxx.  :-+

I would like to ask those who have a DPxxx Rigol it may do a test to compare if it's a problem of my power unit, or if there is a firmware bug general.

The test is the following:  :-DMM
by any value set at the output (for example 1 Volt) increase the voltage of 1 mV at a time, measure the output with a DMM  :-DMM external if indeed the intention output rises to 1 mV at each step, or as in my case increases 0.6 mV and the next step in a 1.4 mV (total actual doing of the two steps 2 mV).  :bullshit:

So every 2 steps it the 2mV correct but to every single-step one is from 0.6 mV and the other from 1.4 mV. This is repeated alternately 0.6 /1.4 ~ 0.6 /1.4 etc.

Thanks

bson:
Cidak, if you want 1V and want to adjust it in 1mV steps, then I'd use CH3.  CH1&2 may not have sufficient DAC resolution to make 1mV adjustments and what you see is consistent with rounding error.  I always use CH3 for these sort of low-voltage experiments.

Belgarion:

--- Quote from: cidak on June 27, 2015, 08:23:40 pm ---To all owners of DP8xxx.  :-+

I would like to ask those who have a DPxxx Rigol it may do a test to compare if it's a problem of my power unit, or if there is a firmware bug general.

The test is the following:  :-DMM
by any value set at the output (for example 1 Volt) increase the voltage of 1 mV at a time, measure the output with a DMM  :-DMM external if indeed the intention output rises to 1 mV at each step, or as in my case increases 0.6 mV and the next step in a 1.4 mV (total actual doing of the two steps 2 mV).  :bullshit:

So every 2 steps it the 2mV correct but to every single-step one is from 0.6 mV and the other from 1.4 mV. This is repeated alternately 0.6 /1.4 ~ 0.6 /1.4 etc.

Thanks

--- End quote ---

These are my results:
DP832 set value (channel 1)Measured on DMM1.000V1.001295V1.001V1.002326V1.002V1.003329V1.003V1.004366V1.004V1.005366V1.005V1.006410V
DP832 set value (channel 3)Measured on DMM1.000V1.000869V1.001V1.001894V1.002V1.002943V1.003V1.003981V1.004V1.005005V1.005V1.006063V

LaurentR:

--- Quote from: cidak on June 27, 2015, 08:23:40 pm ---To all owners of DP8xxx.  :-+

I would like to ask those who have a DPxxx Rigol it may do a test to compare if it's a problem of my power unit, or if there is a firmware bug general.

The test is the following:  :-DMM
by any value set at the output (for example 1 Volt) increase the voltage of 1 mV at a time, measure the output with a DMM  :-DMM external if indeed the intention output rises to 1 mV at each step, or as in my case increases 0.6 mV and the next step in a 1.4 mV (total actual doing of the two steps 2 mV).  :bullshit:

So every 2 steps it the 2mV correct but to every single-step one is from 0.6 mV and the other from 1.4 mV. This is repeated alternately 0.6 /1.4 ~ 0.6 /1.4 etc.

Thanks

--- End quote ---

Look at this post (and the attached histogram) for the statistical result of a full sweep showing in no uncertain term the DAC step size. Also see the rest of the thread for linearity data:
https://www.eevblog.com/forum/testgear/noob-dac-linearity-in-the-dp832/msg584141/#msg584141

I haven't run the same analysis on Ch3, so I can't confirm if Ch3 has indeed better granularity.
Of course, note that this is all way within specs of the DP832.

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