JDS Uniphase SmartClass, User Manual

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Chapter 7 Interpreting Test Results
Copper results
SmartClass ADSL/Copper Tester User’s Guide 55
Copper results
The copper results are described in the tables below.
AC voltage
You measure AC volts to:
– detect the presence of hazardous voltage.
– measure stray or foreign voltages.
– measure ringer voltage level.
AC voltage results on tip to ring should be 0.0 volts. Tip to ground and ring to
ground should be equal to each other. Anything else indicates AC signal inter-
ference and/or an unbalanced line.
Table 21 describes the AC voltage result.
DC voltage
You measure DC volts to:
– detect and measure CO/exchange battery voltage.
– detect crossed battery conditions.
To measure DC volts, remove the line battery and measure tip and ring to
ground. It should be < 3.0 volts; anything else indicates crossed battery that
inhibits digital signals.
Table 22 describes the DC voltage result.
Resistance
You measure resistance to test line continuity and quality, and to detect corro-
sion, shorts, opens, and faults.
The SmartClass ADSL/Copper Tester is able to measure resistance in the
presence of noise and foreign voltage, but the accuracy may be reduced,
depending on the noise level.
Resistance should be measured with the line disconnected, so that the battery
voltage and CO/Exchange termination don't affect the measurement.
Table 21 AC Voltage result specifications
Range (VAC) Resolution (V) Accuracy
Peak voltage < 300 1 2% ± 1.0V
WARNING: HAZARDOUS VOLTAGE
Hazardous voltages may be on the line. 220 mains (RMS) are equivalent to
308 peak. Connecting to these circuits may result in damage to equipment
or serious injury. Do not connect to these circuits.
Table 22 DC voltage result specifications
Range (VDC) Resolution (V) Accuracy
AC peak + [VDC] < 300 1 2% ± 1.0V