Fluke 8050A Instruction Manual page 29

OPERATION
DECIBEL
2-36. Decibel (dB)
2-37. Figure 2-9 describes
how
to
operate the
8050A
for
voltages
in decibels.
When dB
is
selected,
the
8050A
converts ac or dc voltage readings into the
dBm
equivalent
(decibels
above
or
below one
milliwatt).
The
reference
impedance
for decibel
measurements
is
selected
from
16 stored reference
impedances. The 8050A
is
setup
at the
factory to turn
on
with a
default reference
impedance
of
6000.
The
power-up
default reference
impedance
may
be changed
to
any
of the 16 stored
impedances. (Refer
to
Section 4
for
information on
how
to
change
the default
setting.)
2-11