Shorting the inputs
1. To measure the noise floor of the
device, you need to short the inputs
with a low impedance shorting block
(not included). These are often called
“shorting blocks”
or
“terminators”. You
can find these for sale on Amazon or
your favorite component supplier.
Search on
“
bnc 75 ohm
terminator”.
The precise impedance isn’t important,
it just needs to be less than a few
hundred ohms.
2. If you do not short the inputs, then
you’ll
measure the noise of the internal
input resistors
—
and the noise
contribution from the inputs 100K
resistors can be quite high.
Summary of Contents for QA401
Page 1: ...QA401 Quick Start ...
