NTi Audio Acoustilyzer AL1 - Manual (Page 53)

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Signal Balance shows the matching deviation of the incoming signal
between pin 2 and pin 3 in percent (%). The arrow position indicates the
following:
• Arrow in center, the input signal is balanced.
• Arrow out of center, linear indication of a balancing problem, e.g.
arrow moves left nearer to the number 2 shows the signal level on
pin 2 is higher than on pin 3.
• Arrow at left or right end, the signal balance error is 33% or higher.
33% equals a difference in the signal level of 6 dB.
• 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.
Notes:
• The “Adapter -20dB” should be applied for balanced input levels
higher than +20 dBu (see Accessories for details).
• The THD+N results are calculated using a measuring bandwidth
of 10 Hz - 20 kHz.