5.4 Operation mode
Exposure limit calculation
:
(The Display status field shows “EXPOS.-LIMITS”)
Now press the
Enter-key
until the
Display Mode
status field
shows “
EXPOS.-LIMITS
”.
Firstly, the strongest signals are shown along with their
frequencies and levels using markers, just like in spec-
trum mode. The large main display shows the level of the
strongest signal, as usual.
In the graphics display below, the strongest signal is con-
verted to power flux density [W/m²] and displayed. The
cable and antenna data is already considered in these
calculations! Particularly practical: the so-called “Autorange” function: the W/m²
display is complemented with the correct fractional unit automatically:
m
= 1/1000 (one thousandth)
µ
= 1/1.000.000 (one millionth)
n
= 1/1.000.000.000 (one billionth)
p
= 1/1.000.000.000.000
f
= 1/1.000.000.000.000.000
In our example, the display reads 797,21
n
W/m², or 797
billionth
W/m² or in
other words: 0,000.000.797.21 W/m².
As this example clearly shows, one would actually drown in the huge number of
“zeros” without the autorange function.
By the way, the practical HOLD feature is also available in this mode for keeping
the display “smoother”.
Better yet: you can even display
a percentage relative to
an exposure limit
: as vastly different exposure limits
exist depending on your measurement’s purpose and cir-
cumstances, SPECTRAN offers several exposure limits
right away.
You can change between exposure
limits with the left/right arrow keys.
Further explanation of exposure limits can be found
in the
Exposure limits
chapter in this manual.
Just try for yourself: Select the different limits and com-
pare the results. The available choices are:
5.0 Your first measurements / Modes
13
Summary of Contents for SPECTRAN HF-2025
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