HW V4 / © 2005 – 2013 Aaronia AG, DE-54597 Strickscheid
24
Manual Spectran V4
Functional description
5.3.9. Atten
(attenuator)
The internal attenuator attenuates the signal applied to the
input connector by the corresponding amount in dB to avoid
overloading the RF input circuitry.
Experienced users can also set this value manually.
However, in the majority of cases, you should be sure to
leave this setting on the default “Auto” setting!
Warning: If „Auto „is turned off, it is mandatory to activate an attenuator when
applying signals over-20dBm to avoid incorrect results.
Signals beyond 0dBm (peak) can even destroy the input circuitry if no corresponding
attenuator is configured.
5.3.10. PreAmp
(internal pre-amplifier / option 020
)
The optional internal extremely low-noise PreAmp amplifies
the applied signal by approx. 15dB, significantly enhancing
the sensitivity of the device. The OFF setting turns the
PreAmp off (default), ON activates it.
Please note that obviously, the preamp gives varying
performance depending on the measured frequency. Its
amplification decreases particularly with very low or very
high frequencies. Below 30MHz and above 9GHz, its
amplification is almost zero and might even attenuate the
signal. Consequently, it should then stay turned off to insure
the highest possible sensitivity.
WARNUNG:
Benutzen nur bei sehr schwachen Signalen, da dieser bei Signalen über 0dBm
(Peak) zerstört werden kann.
Warning: Only use the PreAmp with very weak signals, as strong signals over 0dBm
(peak) can destroy it!