Manual SPECTRAN V5
© Aaronia AG 2016 | www.aaronia.com
33
CORRECT MEASUREMENT
5.5. Measurements of satellite TV
DC-blocker provides protection from
potentially damaging DC voltages for
Spectran’s input.
You can directly connect Spectran to your LNB’s output (or
alternatively, to the attached satellite cable or receiver) in
order to perform measurements.
Please note that the receiver supplies a 13/18 V DC voltage
to the LNB, which will consequently also be fed into Spec-
tran’s input. While Spectrans can accept DC voltages of up
to 50V, it is always possible for the DC voltage to vary sig
-
nificantly and intermittently exceed acceptable levels, lead
-
ing to the destruction of the unit’s input.
We thus strongly recommend you use the optional DC block-
er which can simply be inserted before Spectran’s input and
effectively eliminates any DC voltages.
It does not influence measurements in any way.
5.6. Measurement with a direct cable connection
20dB
Attenuator
Please be careful not to destroy Spectran’s input circuitry
when conducting measurements with direct cable connec-
tions to other equipment (especially in the case of function
or RF generators) as such equipment might generate ex-
cessively high voltages or power. Even a very short over-
load can irreversibly destroy Spectran’s extremely sensitive
input.
To prevent damage due to excessive input levels, be sure
to always utilize our optional 20dB attenuator in such appli
-
cations.