Excellent! That measurement is more relevant to everyday use than the long term fully stabilized multi day stability.
Exactly my thought!
Now I have measured and tested for hours, and I have some disturbing results. The CC on my 2005 is performing very poor, much worse than my cheap china PSUs.
Here what I did:
As I said, let my Fluke 45 and my DM3061 measure a current from another PSU to temp stabilize their current shunts. Meanwhile, my 2005 was powered on, dialed in (even max current), but with no load. Therefore, the theory is that every part in the measure setup is warmed to stability except the CC circuits in the 2005. After several hours, my cheap china PSU was delivering minimum of 150.4018 mA and maximum of 150.5309 mA:
Max Min Avg Smpl
LSP-1403 150.5309 150.4018 150.4949 17420
PD 2005 147.5291 145.7476 146.1012 100
PD 2005 147.5291 143.3662 144.3162 15970
PD 2005 145.1924 143.3182 144.0457 8820
(Every row with 2005 is a cleared of max-min, to see if things improve after warm up of the CC circuit)
The disturbing part is this: Max and min for the china PSU is drift, while max and min for the 2005 is short time oscillations. Even when I reset the statistics, in a few minutes, the max and min has reestablished.
But, when the CC knob is above the current depending on the load, everything is stable to sub µA and sub mV. So this does not seem to be a noise depending on the load, but on the CC circuits.
I also tried to measure open circuit V, small load V (without CC), with a scope, and even if the drift is very, very small, the noise is huge. I have a peak at 50 and 100 Hz (no surprises there) but the highest peek was at 1.59 kHz. The problem is that I have little or no control of noise-sources as I have my computer near, the scope is a USB one, etc, so the noise can come from everywhere. Anyhow, my 2005 is as good as everyone else's when as a precision voltage source, but my unit is useless as a precision current source. The oscillations does not seem to depend on temperature. Something else is the culprit.
Sorry for my English, I hope you will understand my tests. Do anybody think that replacing ecaps is a good idea?
Edit: To be clear: All my gear has been on for several days now. The only thing that can be considered "cold" is the current shunt/CC circuits of the 2005. But the PSU has been ovenized and on for the whole time.