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| HP dual power supply, tracking and earth? problem? |
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| coppercone2:
I noticed when I try to use my HP dual power supply 6227B, if I have it in tracking mode, and connect earth (oscilloscope) it stops output. Even if I put a jumper banana plug from Ground to the joined channels it drops off. is it broke or is this how it works? it means you need everything connected to it to be floating when its in tracking mode. I think I just did a whole bunch of tests that basically provided no power because I set the voltage, then set it to current monitor mode, then connect the scope. Unless it was working and broke. IDK I lost track of what exactly was happening because I am mega pissed off at this PCB. :rant: if someone has one, can you just tell me what happens to the meter when you connect ground to the shared 0V terminal from the PSU when its in Tracking mode?? |
| alm:
What other front panel connections (e.g. negative of left channel to positive of right channel per manual) are you making, and what does the strapping on the rear look like? |
| coppercone2:
idk its default and I mean if its connected in tracking mode, and you touch the negative terminal to earth ground. i.e. connect 2 and 4 (shared 0v) then connect 3 to 2 it says your not supposed to use the rear panel for tracking because of sense. never touched the rear panel |
| wn1fju:
On my HP 6227B, here's what happens: 1) Set to individual mode, voltage shown on both meters is unaffected if either (or both) negative terminals are shorted to ground terminal (as expected) 2) Set to tracking mode, voltage shown on master meter is unaffected if the master channel's negative terminal is shorted to its ground terminal 3) Set to tracking mode, voltage shown on slave meter is unaffected if the slave channel's negative terminal is shorted to ground AND the master channel is left floating 4) Set to tracking mode, voltage shown on slave meter drops to zero if BOTH the master and slave channel's negative terminals are shorted to their respective grounds. Master channel meter remains at original voltage. So I guess case #4 is the "illegal" one. I usually leave all my power supplies floating anyway. |
| alm:
--- Quote from: wn1fju on December 18, 2023, 02:35:18 pm ---4) Set to tracking mode, voltage shown on slave meter drops to zero if BOTH the master and slave channel's negative terminals are shorted to their respective grounds. Master channel meter remains at original voltage. --- End quote --- Read the manual about tracking operation. I'm pretty sure it says in tracking mode, to always connect the left (master) negative terminal to the right (slave) positive terminal. Which to me implies there is an internal connection, but it may not be capable of carrying all the current. So in that case connecting the master and slave negative terminals together (through earth or not) would short the slave. |
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