Products > Test Equipment
E3634A 4 wire connected to electronic load displays incorrect monitor current
Helix70:
Hi all,
I have an Agilent E3634A that I have repaired, but there is one fault that eludes me. Everything works correctly with static loads, and also when the sense terminals are linked at the terminals.
When I run separate sense leads and power leads to an electronic load (Tenma/Korad) set to constant current 4A, and set the E3634A power supply to 2V at 5A limit (CV), the monitor current reads 1.0-2.0A despite the load drawing 4A as expected. Changing the current limit on the 3634A down to 3.9A forces into CC mode and then the monitor reads accurately as expected.
When I probe the sense terminals when I see the fault, there is a 60 kHz ripple of about 0.5V visible, which disappears when CC is forced or the voltage is higher in CV mode.
Anyone else able to replicate? Is it the PS, the load, the idiot operator? Any other ideas?
Regards,
Josh
Ugur:
Have you tested it by connecting a resistor to the output of the power supply?
Helix70:
Yes, as I said in the initial post, works correctly with static loads.
Ugur:
Sorry I missed it. In this case I think there is a problem with the electronic load. Have you tried connecting the electronic load to another power supply to be sure?
Helix70:
I am probably hoping for someone who can test it on their power supply. The electronic load works fine, and it is a very specific problem, but thanks for your advice.
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