Operation
0
3-6
With LOG/LINEAR switch (11) set to LOG,
lighted index lamp refers matching
dB
graduation
to
top
LOG
REF line
of
graticule; for example, if
-30 dBm
is
opposite lighted lamp, then top
LOG
REF line
is
-30 dBm
and
so serves
as
an
absolute
Model8555A
amplitude reference. With
LOG
/LINEAR switch
set to LINEAR, lighted index lamp indicates the
matching voltage graduation to
be
used
as
a
per-
diviSion multiplier for calibrated voltage readings
(blue marking).
Figure 3-2. Typical Display and
IF
Section Controls, Connectors and Indicators
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