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Rigol DP832 - Firmware list and bugs

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IAmBack:
Ok.
That's what I will try to do.

EDIT
Seems to be O'k now, so Thank You.

IAmBack:
I've just measured speed of OCP reaction. Not scientific test, but I wanted to see how it works.

I've set output voltage to 2V,output current to 500mA and OCP to 300mA. Output was loaded with 1k resistor. Then the 1,5Ohm resistor was added in paralel as a "shortcut". This allows to see when OCP turns off the output.

For given settings I have measured about 200ms (!) for channel 1 and 2, and about 300ms (!!) for channel three.

Changing the current limit to 2A for channel 1 slowed-down reaction to 400ms (!!!).

With higher output voltage (15V) reaction time shortened to 200ms. I did not checked other channels/settings.

Do You like those results? I expected to see the reaction times 4-5x shorter.

With the values given above I'd say its a bug. Maybe someone can check it with other fw?

nctnico:
How much capacitance is at the output and what do the waveforms look like? Most power supplies (say 99.9%) have a large capacitor at the output and it's charge is dumped into the load before the short circuit protection kicks in.

IAmBack:
Rather not the result of capacitance.
See the plot.
Current was set to 2A, so the output voltage drops to 3V.
This time, for 15V OCP reaction time  is 400ms!

TurboTom:
Has anybody got a Python calibration script for the DP832 (F/W 01.14) in combination with a DM3068 (F/W 01.10) that really works? I experimented with what I found here in this thread (I really appreciate what the contributors provided here even though it won't work for me) and I found out that my DM3068 won't reply to the "uptime:" inquiry so I simply commented the corresponding lines out . Moreover, my DM3068 requires more time for the self test than the timeout setting in LxiInstr.py, so I increased the setting to 25 seconds which did the trick.

Now the voltage calibration tests (Ch1 of the DP832 so far only) appear to be running okay, yet when I'm supposed to change the wiring for current measurement and confirm this, the calibration procedure terminates with the following message:


--- Code: ---.
.
* DM3068 <<< '[30.0002061]'
* DP832 >>> 'CALibration:MEAS CH1,V,9,30.0002V,0'
* DP832 >>> 'SYST:ERR?'
* DP832 <<< '0,"No error"'
ADC-V  9 :  Point:   +30V - DMM:  +30.000206V - Err:0.000687%
* DP832 >>> 'CALibration:Set CH1,V,10,32V,0'
* DP832 >>> 'SYST:ERR?'
* DP832 <<< '0,"No error"'
* DM3068 >>> 'READ?'
* DM3068 <<< '[32.0024431]'
* DP832 >>> 'CALibration:MEAS CH1,V,10,32.0024V,0'
* DP832 >>> 'SYST:ERR?'
* DP832 <<< '0,"No error"'
ADC-V 10 :  Point:   +32V - DMM:  +32.002443V - Err:0.00763469%
* DP832 >>> 'OUTPUT CH1,OFF'
* DP832 >>> 'SYST:ERR?'
* DP832 <<< '0,"No error"'

Connect the DM3068 10A CURRENT inputs to DP832 channel 1
Press enter to continue
* DM3068 >>> 'CONF:CURR:DC 10A'
* DM3068 >>> 'SYST:ERR?'
* DM3068 <<< '0,"No error"'
* DM3068 >>> 'VOLT:DC:NPLC 100'
* DM3068 >>> 'SYST:ERR?'
* DM3068 <<< '0,"No error"'
* DP832 >>> 'OUTPUT CH1,ON'
* DP832 >>> 'SYST:ERR?'
* DP832 <<< '0,"No error"'
Shutting off PSU outputs
* DP832 >>> 'OUTPUT CH1,OFF'
* DP832 >>> 'OUTPUT CH2,OFF'
* DP832 >>> 'OUTPUT CH3,OFF'
ERROR: global name 'calib_single' is not defined
Calibration failed. Terminating.

d:\Incoming\Drivers\Rigol\DP800\DP832_Cal>

--- End code ---

Since I'm really not into (Python...) programming, has anybody got the calibration running with a similar configuration or could point me to the right direction so I can get it to run through all modes / channels without errors?

Thanks,
Thomas

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