NTi Audio Acoustilyzer AL1 - Manual (Page 48)

48 49
b. Cable Polarity Test
Use the polarity test signal of the Minirator to
feed the cable under test. The Acoustilyzer
analyzes the signal polarity at the other end
of the cable.
Acoustilyzer settings:
• IN: XLR/RCA,
• Mode: Cable
The following problems may be detected quickly and easily:
• Wrong polarity, caused by wrong or defective wiring inside the cable
• Cable problems, unsymmetrical signals; displayed with the balance
indicator, such as
“2UBAL–” indicates an audio signal only on pin 2 of the symmetrical
XLR cable → no signal on pin 3.
“ -UBAL3” indicates an audio signal only on pin 3 of the symmetrical
XLR cable → no signal on pin 2.
The balance indicator being “out of center” indicates other cable problems
as explained in detail in the NTi Audio application note “Signal Balance“
(available for download at the NTi Audio website).
The level measurement is very useful for applications, such as testing of
multicore cables (see the NTi Audio website for application notes).