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724-746-5500 | blackbox.com Page 15
Chapter 4: Using the Cable Length Meter
3. Press the SET LEN (LEN = Length) key, and the Set Length screen (Figure 4-2)
appears. In this mode, use the UP/DWN keys to adjust the larger digits to match
the length of the sample wire (100–200 ft. range). If the sample wire is 150 feet
and its resistance is equal to 0.315 ohms, the smaller digits on the left-hand side
of the screen will display “0.0021 ohms/ft. (150 feet/0.315 ohms = 0.0021 ohms/
ft.)
4. To store the new value, press the SET LEN key for approximately 1.5 seconds. The
unit generates a confirmation beep. The new 12 AWG length coefficient of
0.0021 ohms/feet will be stored in memory in place of the factory default of
0.0017 ohms/feet.
NOTE: Restoring Factory Default Values. To restore factory coefficients back to
their original values, hold the UP/DOWN keys and the Power key down at
the same time when powering down the unit. Any previous values stored by
the user will be deleted from memory. Table 4-2 lists the factory default
values.
Table 4-2. Factory default values, ohms/feet.
AWG Aluminum Copper
8 0.00103 0.00063
10 0.00164 0.0011
12 0.00261 0.0017
14 0.00414 0.0025
16 0.00659 0.00455
18 0.0105 0.0061
20 0.0167 0.00945
22 0.0265 0.0168
24 0.0421 0.0273
26 0.067 0.0436
28 0.106 0.0637
30 0.169 0.108