Model 8901B Operation
HP-IB.
Automatic Selection
of
Pre-Display.
When the true
rms
detector
is
selected, the pre-display mode for FM de-emphasis
is
automatically
enabled. This is true whether FM
has
been selected or not. (Selection of the FM de-emphasis time
constant, however, remains unaffected.) The pre-display mode remains enabled until deliberately
disabled. This idiosyncrasy
is
important
to
remember when programming the instrument
via
HP-IB.
Considerations When Using the
RMS
Detector
During FM measurements
if
the RMS detector
is
selected (Blue Key, AVG), FM de-emphasis pre-
display is automatically selected. Pre-display must turn on
at
this time due
to
circuit configuration
of
the Modulation Analyzer. When pre-display
is
selected this way,
it
will
not turn
off
automatically when
another detector
is
selected.
Turn
off
pre-display
(after
selecting another detector) by pressing the PRE
DISPLAY key (HP-IB code:
PO).
Measurements could be affected
by
this pre-display selection.
FM De-emphasis
3-161
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