22 Feb
2015
22 Feb
'15
9:26 a.m.
From: Matt Burke
You need to connect a DMM with mA (or better uA) range
in series with
the bench supply and capacitor
I was wondering about that - isn't the startup current, when the supply is
first turned on, going to be substantial, especially with the larger caps?
Any chance that could harm the DMM (or am I too used to old mechanical
meters? ;-), or are they pretty well protected against over-current
situations?
If one does have to worry about this, is there a need for some sort of switch
arrangement so that on initial power-on, there's a direct connection (supply
-> cap), but once it's been on a few seconds, one can switch to route things
through the DMM, to measure current with the cap mostly charged?
Again, apologies for the elementary questions, but I'm not a hardware guy by
trade... :-)
Noel