As you may have noticed from another thread, I had a non-working 6674A (option J06, 70 V @ 30 A), which I have now got working, although some of the capacitors don't look in great shape, so I don't suppose it is meeting all the specifications. But at least from the front panel it responds as expected.
Anyway, something I have noticed, that I have never seen on any of my other Agilent/HP 66xx series power supplies is the following.
With no load on the 6674A PSU, the ammeter reads virtually zero as expected. If the voltage is changed, there's a change in the ammeter. It is hard to read how much it is moving by looking at the digits rapidly changing, but I think somewhere in the range 100 to 200 mA. Then it settles back down to almost zero in fraction of a second.
I assume this current is due to some capacitors being charged./discharged as the voltage is changed, and is nothing to worry about. Can anyone confirm if this is so? I have a number of HP/Agilent 66xx power supplies, but have never noticed this before. But the 6674A is the most powerful (2100 W) of any I own.