| Products > Test Equipment |
| E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A) |
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| LaurentR:
Finally, the Matlab version: Setup: * E36313A (1.1.1 FW) in series mode. Current set to 1A. Voltage sweep from 0V to 3.5V. * One DMM (3446XA) in DC current mode, fixed 3A range, directly plugged to the output of the PSU, as documented for the series mode (left terminal of Ch2 and right terminal of Ch3). * One DMM (3446XA) in DC voltage mode, fixed 1V range, plugged to the same terminals. What we see: * 0-0.4V: CV mode. Readout voltage similar on PSU and DMM and ~= Set Voltage on PSU. Readout current similar on PSU and DMM and proportional to Set Voltage. All good. * 0.4-1.3V: CC mode. Readout voltage constant and similar on PSU and DMM. Readout current similar on PSU and DMM and ~= 1A. All good. * 1.3-1.6V: :scared: mode. Readout voltages agree but resume climbing. PSU readout current showing stable ~= 1A while actual current on DMM goes up. * 1.6+V: :-// CC mode. Everybody is constant again. Voltages agree but currents don't. PSU current claims ~= 1A while DMM ~= 1.1A. Voltages agree with DMM current, definitely not with PSU readout current. I tried at 2A and it's pretty much the same with an inflection zone ~2.4-2.8V and at 0.5A, the zone is ~0.7-1.1V. The inflection zone also changes with the burden voltage. With Set Current to 1A and comparing the 10A input of the 3446XA vs. the 3A input in 3A range, the burden voltage is ~0.058V vs 0.425V and the inflection zone is 0.59-0.85V vs. 1.32-1.66V. I have an email out to Keysight. I'll keep everybody posted on this. I'd still be interested to see if somebody can reproduce it or if this is just my unit. |
| nctnico:
It seems my unit does the same. I'll check to see if it matches your values later today. |
| HighVoltage:
So far I had not used Series or Parallel mode on my E36312A. It seems my unit behaves very strangely, or I do something totally wrong. When I set mode coupling to SERIES, I get the following: - On the display it shows that Series Mode is turned on between CH2 and CH3 - When I turn all channels ON, only CH1 and CH2 light up as ON - CH3 light is OFF - CH3 carries 1V (set to 1V) (hmm ... weird) - CH2 carries 1V (set to 1V) - CH1 carries 1V (set to 1V) - Output between CH2 and CH3 carries 0V - Output between CH1 and CH2 carries 0 V - If I add a series cable connection between CH1 and CH2 I get 2V on the output, although CH1 is set to 1V and CH2 is set to 2V Hmm, big flaw it seems Let me update to the latest FW and test again. |
| HighVoltage:
OK, I should have done the FW update first and the series mode testing. FW update was a success. The series mode is working now. However, I can confirm the strange increase from 1.0A to 1.1A by just increasing the output set voltage of the PSU. Voltage set to 1V and current set to 1A results in 1A measured with the 34465A. Increase set voltage slowly and at about 1.35V the current starts to increase. At about 1.7V set voltage, the current has increased to 1.1A (10% error) |
| TiN:
Mine does same, I had to increase 1.6V, current goes up to 1.0995A (K2002). Same happens with lower Ilim (0.1A will give 10% limit error = 0.110A) when voltage set over 0.534V. |
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