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In article writes:

Can you please offer some advice on how to go about measuring the
output voltages on my converters, gear etc. What exactly do I need to
do this? an RMS voltmeter?

Why do you want to do this? Curiousity? Test? Just want to find out
what you have? For mostly useful audio measurements, I recomment the
NTI Minilyzer, and the companion Minirator as a source. They don't
cover the analog levels you'll encounter at full scale digital level,
but they're good for general measurements.

Also, if I want to perform tests on preamps (S/N, THD+N, etc) , how do
I go about setting up a load on the input (simulate a mic connected).
Does anyone make a product, say an XLR with with user-selectable
resistance?

This is the sort of thing that test technicians make themselves. It's
not rocket science. I usually make noise measurements of mic preamps
with the input shorted.

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