Sorry, I'll explain that a bit more. My old Tripple linear power supply (although it seemed better isolated and had easy features like one button series and parallel and did up to 5A per channel, or 10A -60V depending how you had it configured) worked ok, but the display showing the current draw and voltage was off. So I found my self contanty wiring other meters in line to get an accurate load draw in the device, but in doing so cussed a voltage drop. It's the main reason I wanted a precision power supply so I dint have to spend the star time figuring out how much voltage was drop happened depending on the amount of current being used by the DUT. With the DP832 I hope I won't need the 4 other DMMs wired up when providing 2 channels of different voltages to a single device. It became tired some and took a lot of space up on the bench. Not to mention I only own one DMM that had the 50,000 count and acuracy that I considered acceptable when testing, that's the fluke 289. Other meters like the bryman 235 are great, but lack the resolution sometimes for the finer precision items I'm working on.
So when I was planning out the calibration I kind of figured I would run into the same burden voltage, but now that I'm thinking about it again to calibrate the current factor it wouldn't matter if the voltage was affected on that line through the meter I'm using for calibration since I won't have a DUT hooked up. So it might of been the habit of thinking alway having to put another meter in line since I had to think like that when testing a device.
So since I know the 34401A can take short time with 3.2A (I just did this today using the min/max on testing something by mistake, something i was testing had a short and caused the spike at 3.2145A) then it sounds like I can just follow the normal procedure and use the 34401A on DCI for the calibration figure adjustments, and forget about changing the code to use the shunt for the voltage reading on the shunt.
FYI, I know I should have had OCP on, but I'm still learning this PSU so the 3.2A reading won't happen in the future unless I need a component to heat up so I can see what's failing with the Flir.
Thanks,
Scott
author=LaurentR link=topic=24919.msg960804#msg960804 date=1465794678]
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
Note that I don't understand your point on the burden voltage. While calibrating current, it is in CC mode and the burden voltage should not matter.
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