Neither a test record or CD will help to calibrate the meter unless you have a TRUE RMS multimeter.
The vinyl's output level will depend on the efficiency of your cartridge, and carts vary like mad, so that's a no-no.
Likewise, a CD will be calibrated to 0dBfs, which is a digital standard and its relationship to the analogue output level from your DAC's buffer will vary (if you look at the CD player's manual, it should tell you the analogue reference voltage for 0dBfs btw).
The only way to calibrate your meter will be to play either a CD or Test Record, or - better - connect an oscillator, BUT measuring the output of the device with a TRUE RMS multimeter so you know the absolute voltage.
In all honesty, if you're unsure, just use your ears:
Drive UREi until it distorts audibly. Set this as the upper threshold for the meter, above what you consider to be a safe working level.
An example: you might want it to distort 12dB above what you consider is a safe PEAK level. Adjust the meter to clip at +12dB and you'll know that you have 12dB in hand before it clips if your peaks hit 0.
I can tell you exactly how to calibrate it by the book, but unless you have a TRUE RMS multimeter, you're on a sticky wicket. Even if you have the kit to calibrate, you might use some “artistic license” in calibrating anyway, so a lack of test gear isn’t a big deal, unless you really want to calibrate it according to UREi’s ‘specs.
edit: If you like maths, you probably could calibrate it by the book without an RMS meter, but you will have to trust all the manufacturer's levels on the tone record and cart etc, so it's a tad risky.
Last edited by thermionic : 10-26-2006 at 06:41 PM.