25
Sidekick
®
Plus Test Set
Longitudinal Balance
Longitudinal Balance is a measurement of a pair’s
quality. A pair having a high balance value is less sus-
ceptible to noise and interference. Low balance values
can be associated with “hum” on voice circuits, and
with impulse noise causing intermittent DSL service.
Longitudinal Balance Measurement
To perform the Longitudinal Balance measurement:
1. Connect the test leads: black to tip, red to ring, and
green to ground.
2. Move the rotary knob to the STRESS/GRT position,
and then press F2.
To return to the STRESS function, press the F2/Stress
key, or change the rotary knob to any other function.
The specifications of the Longitudinal Balance
measurement are as follows:
• Range: +100 dB to +20 dB
• Resolution: 0.1 dB
• Accuracy: ±2 dB from +20 dB to +90 dB;
±5 dB from +90 dB to +100 dB
• Longitudinal excitation: +90 dBrnc (0 dBm);
± 2 dB into 1 kΩ
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