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TRILITHIC
Model One Operating Manual
– 59
The scale indicates
∆
dB to show the
difference between the new spectrum scan
and the reference spectrum data. The
reference remains in the meter’s non-
volatile memory even when the Model One
is turned off. This enables you to mea-
sure the level’s relative change at a later
time.
To perform a new TRANSMISSION TEST
at any time, confirm that TRANSMISSION
is set to YES in the MEASUREMENT set
up menu (see page 25) and then press
SPECT
.
The Model One will perform a spectrum
scan and compare it to the reference data.
In this example, a 10dB loss is seen at
each active video carrier sampled in the
spectrum scan.
Press the
UP
or
DOWN
arrow buttons on
the key pad to move the marker frequency.
NOTE:
The SPAN function does NOT
operate when the meter is in the
TRANSMISSION mode.
For normal (absolute) spectrum
measurements, set the TRANS-
MISSION selection to NO in the
MEASUREMENTS set up menu (see
page 25).
Advanced Operation
19:36:31
TRANS
REF
SCALE
∆
$$
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15
∆
$$$$$
5
∆
$$$$$
-05
∆
$$$$$
-15
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MKR
301.25M -09.7dB
ST
07.00M
SP
--M
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