You haven't stated what your intending to use it
for.
I may be able to help there...
The OP has an H7140 PSU in his 11/24. It failed, and a bit of testing
showed the 'bias supply' which is a small SMPUS that urns all the time
the machine is plugged in and which porvides power for the control
sircuirty for the rest of the PSU wasn't doing anyting.
This particualr part of the supply is not reparier-friendly in that
virtualyl evrythign is directly conencted to the mains. But he pulled the
'bias and interface board' and run the circuitry from a 9V battery so
that he could look at the pins of the 555 timer that's the control
oscilaltor for the supply. The fact that pin 3 was stuck at 0V suggested
the 55 was not sscillating, and I suggested he replace it.
This he did, alas when he reassembeld the supply and connected it to the
mains all hell broke loos with transistors and ICs blasted off the board.
I am still trying to work out why.
My suggesti9on is that he rebulds the board and runs it off a battery
again and checks that wveforms round the 55 and the rest of the chopper
drivr cirucitry are sensible. For that he needs a 'socpe.
I uspect that for that almost _any_ 'scope would do, but equally it's
worth getting something that will be useful for other classic computer
repairs.
DSO are fine but there are good reasons to go with
an analog scope ( I prefer these ).
My view is tha analogue 'scoep and SO are different instruments and that
sometimes one is more use, sometimes the other. I too prefer the analogue
'scope for most work (in fact I don't think I've ever wanted a DSO to
repair a clasisc computer, although I do use a logic analyser).
Delayed sweep and a minum of 2 channels is a must
for most clasic computer work.
Agreed...
-tony