Operation Model 8901B
LOCAL
(keystrokes)
-
(program codes)
2. Set the display
to
the desired reference value, either
0
adjust the signal parameter being measured for a display equal
to
the desired
0
enter the reference on the numeric keys.
(If
the reference value
is
to
be negative, select
reference, or
minus;
that
is,
the Blue Key, then the decimal key.)
3.
Select RATIO. The display will show the measurement result relative
to
the reference.
To use the Previous Ratio function
to
restore
a
previously-entered ratio reference:
1.
Select the desired Measurement mode.
2. Select PREVIOUS RATIO (Blue Key, RATIO). The display
will
show the measurement result
relative
to
the original ratio reference. (The Modulation Analyzer uses the previous ratio reference
regardless of what Measurement the instrument was in when the ratio reference was entered and
regardless of the current Measurement mode.)
To display the ratio (or previous ratio) reference, key
in
11.2 SPCL.
rD:y
El
Y
Display
The displayed measurement result is
100%
REL
if
linear units are selected or
0
dB
REL
if
logarithmic
units are selected. (The display
will
normally
vary
about these nominal values due
to
noise and the
typical one-count uncertainty in the measured result.)
If
it
is
desired to scale FM measurement results relative
to
50
kHz, set the Measurement mode
to
FM.
LOCAL
(keystrokes)
-
(program codes)
50
R1
Data
lL
Display
If,
as
in the previous example,
35.35
kHz
FM
deviation was measured, the displayed measurement
result will be
70.7%
REL
if
linear units are selected or
-3.01
dB
REL
if
logarithmic units are selected.
3-216
Ratio and Log/Lin
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