Amber 5500 - Page 23

Amber model
5500
Owner’s Manual
Version 07
or
dBu as is read on most
dBm meters.
Also,
remember that the
5500
uses this
mathemati-
cally
correct dBm
interpretation
when cal-
culating
its
output
level. If the instrument is
told the external load for dBm is
150 ohms
2-21
_
Programmable
Audio
Measurement
System
Section 2
for
example
(5.150
SPCL),
then an im-
pedance
of 150
ohms
is used
in the dBm
calculation.
0
dBm will be
1 mW or
0.387
V
in the extemal
150 ohm load in this case.