Re: Looking for sensitive audio RMS meter
Hi Ted, thanks a lot. Great ebay find by the way. It's on its way totoggle quoted messageShow quoted text
me now. Thanks for sharing your experience with someone learning like
I've had a few questions, if that's ok:
1. Is it possible to measure dBV readings with this meter? I know it
doesn't have the markings for dBV, only dBm, but is it just a case of
taking the reading, adding some sort of fixed offset, and now I have
the number in dBV? I know there's a simple relationship between dBu
and dBV but I think the relationship between dBm and dBV is on a case
by case basis. I know the meter has high input impedance - so it's not
really going to load the output of the DUT like a real 600 Ohm input
meter would. But it provides a dBm "into 600 Ohm" measurement. I guess
that's just simulated?
2. The device I'd like to measure right now is the Bryston 10B. I am
not sure if they use rms noise or NRI. Thanks for teaching me about
the distinction. The specifications are here:
go to page 4, it's in the middle. It just says "Noise: > -100 dB unweighted".
Its output impedance is 100 Ohms. I see the meter itself has 2MOhm
input impedance. Does this mean it'll be perfectly able to measure the
noise at its lowest settings? Does the measurement of RMS noise at the
lowest settings get affected by the DUT's output impedance?
I'd also like to measure the noise of DAC outputs. I think someone
mentioned that those should be measured differently, but I'm not
really sure how that is supposed to work.
I assume given its ranges, this meter can also be used to measure the
noise output of power amps (when nothing is playing through them).
3. Why the Levell specifically, and not some other device? Are there
other such good devices you would recommend?
Thanks a lot!
BTW, I compared all the meters mentioned in this thread. This is what
I came up with (see link below). Some of the numbers might be a bit
off, so double check - but it looks like the Levell is best
inexpensive meter for my use due to low self noise, good range, and
high input impedance. I'd love to hear comments.
I'm also getting a 3457A (from Liam, thanks!) which will be very
useful and has a much
higher resolution - but might not always be the most practical.
On Thu, May 13, 2021 at 2:16 AM Ted Rook <email@example.com> wrote: