Forward Path NPRT 2200 Noise Power Ratio Test Set
The NPRT 2200™ measures the NPR of a device across a range of
power levels.
This test quantifies intermodulation
distortion and determines the dynamic
range of optical transmitters, amplifiers and other active
HFC network devices.
The included PC software uses predefined test setups
to run a “Power Sweep” series of NPR measurements
and graph the results. The measurements are
compared to a threshold value to determine the
acceptable operating power or dynamic range of the
device. Results may be stored on the PC for further
analysis and the graphs may be printed.
The NPRT 2200 inserts calibrated levels of white
Gaussian noise (WGN) through a Device Under Test
(DUT) then measures the noise level at a frequency
where a notch filter is located.
The NPR is the ratio of the output power without the
notch compared to the power with the notch filter. A
graph of NPR versus input power illustrates the linear
dynamic range and inter-modulation distortion
characteristics of the DUT.
Our NPRT 2200 performs the measurements outlined in the
SCTE 119 spec, but in an easier and more automated manner.
The NPRT 2200 maintains constant total power with notch in
and out. And with the included NprGraph program on the PC,
the measurements are automatic and the program plots out
the curve and calculates the dynamic range.