EXFO CableSHARK P3 VF/DSL Cable Qualifier - Manual (Page 123)

CableSHARK P3 User Guide
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End) not to reflect back any test signals or unnecessarily attenuate the test signal.
The options are 100 ohms, 135 ohms, and AUTO (older hardware will still show
120 and 150 ohms). For single-ended tests, the AUTO impedance setting is
recommended because it gives better accuracy by measuring the cable and
selecting the most appropriate attenuation.
NOISE FILTER: The options are ISDN E Filter, HSDL F Filter, ADSL G Filter and No Filter. No
Filter is the most ideal selection since it gives the user an unbiased analysis of the
results.
NOTE: The Noise Filter is not available when Test Type is set to the PSD 6 MHz
setting.
MEASUREMENT
UNITS Allows the user to specify the measurement units for the test. The choices are
dBm and dBr n.
The following items pertain to the Test Type of Impulse Noise
IMP NSE
THRESHOLD
:
Allows the user to preset a threshold (minimum) level of an acceptable noise
spike. The default value is –43 dBm or 47 dBr n.
MEASUREMENT
UNITS Allows the user to specify the measurement units for the test. The choices are
dBm and dBr n.
IMP NSE MEAS
TIME: Allows the user to determine the time during which to count impulse noise spikes.
The options are 1 minute, 5 minutes, 15 minutes, 60 minutes, or 24 hours of
testing. Impulse Histogram
The following items pertain to the Test Type of Impulse Histogram
IMP NSE
THRESHOLD
:
Allows the user to preset a threshold (minimum) level of an acceptable noise
spike. The default value is –43 dBm or 47 dBr n.
MEASUREMENT
UNITS Allows the user to specify the measurement units for the test. The choices are
dBm and dBr n.
PLOT INTERVAL: Allows the user to determine the time during which to count impulse noise spikes
before displaying results on screen. The options are 1 minute, 5 minutes, 15
minutes, or 60 minutes.