EXFO CableSHARK P3 VF/DSL Cable Qualifier - Manual (Page 127)

CableSHARK P3 User Guide
115
MAIN
MENU
E F CHG
PEAK ZOOM IN
VERT
ZOOM IN
HORIZ
dBm/Hz
0.00 1500 3001 6003 kHz 4502
Noise PSD
Cursor Frq. =
= -112.74 dBm/Hz
3001.5 kHz RMS Noise
Impedance
Noise Filter =
=
= -61.16 dBm
100 ohms
No Filter
dBm
-10
-40
-70
-100
-130
FREEZE
20
-10
-40
-70
-100
Press or to move cursor
PROBABLE SIGNAL - undetermined
F IGURE 8.4.2C - N OISE PSD R ESULTS F OR 6 MH Z B ANDWIDTH
The PSD test can also be run continuously or in PEAK mode where PEAK mode redraws a new point if this
point is greater in level than the previous. The PEAK mode is ideal for long term analysis of a circuit to help
identify transients or intermittent crosstalk / noise.
NOTE: Press the FREEZE button to stop the continuous NOISE TEST.