EXFO MaxTester 635 User Manual
Page 238
Copper Auto Tests
230
MAX-635
User Auto Test
Resistance uses DC current to measure the opposition to flow, or
resistance, between each of the lead combinations. It is also used to
identify possible faults, and to measure the resistance of the twisted
pair cable for estimating loop length.
Resistive Balance measures and compares the resistance of each leg.
Isolation measures the quality of insulation or sheathing for the copper
pairs.
Capacitance/Opens measures the capacitance of the cable for
estimating loop length.
VF Noise measures voice frequency noise in the line.
Power Influence measures the effects that 50 Hz and 60 Hz power line
(AC Mains) interference has on the circuit under test.
VF Impulse Noise measures the random occurrences of energy spikes
in the voice frequency range that have random amplitude and spectral
content.
WB PSD Noise measures power spectral density noise.
WB Impulse Noise measures the irregular occurrences of energy
spikes in the wideband range that have random amplitude and
spectral content.
VF/AC Balance (Active) is very useful in identifying loops that will
suffer from crosstalk.
WB Balance ensures that the balance ratio for the twisted pair
complies with applicable standards so as to reduce the effects of
common-mode voltage to ground.
WB Attenuation measures the dissipation of power of a transmitted
signal as it travels over the copper line.
Load Coils detects the presence of load coils in the line.
TDR characterizes and locates faults in cables under test.