Applied Instruments AI Turbo S2, Operation Manual, Page: 33 / 69

Operation Manual AI Turbo S2
Page 33 of 69
12. Noise Scan
The Noise Scan feature simulates a sweep test for testing cable wiring within a building. This
function tests the frequency response of the cable system to determine if it is suitable for L-band
distribution.
Theory of Operation
This function requires a noise source such as the Applied Instruments’ model NS-1 test signal
generator to inject RF power across the entire L-band spectrum into the cable network. The
noise source is connected where the satellite signal would normally enter the building.
The AI Turbo S2 is then connected at the drop points within the building and a measurement
scan is performed. The scan compares the present readings with a previously stored reference
reading to determine the effect of the cable system on the RF signal. The data is displayed
graphically along with summary readings.
After the user specifies the expected RF level entering the network, the AI Turbo S2 uses the
measured losses to calculate the expected min/max levels at the receiver. These are compared
to limits set by the user and a Pass/Fail indication is given.
Normalization Scan
This step is required before scanning a system to normalize the readings to the noise source.
1) Connect the noise source (NS-1) directly to the ODU / LNB port of the AI Turbo S2 meter
using a short jumper cable.
2) Turn the noise source on.
3) On the AI Turbo S2, select:
a) MENU
b) Spectrum
1) Connect NS-1 to ODU/LNB port of AITS2 with short (i.e. 2-3 ft) coax jumper cable.