Megger BTDR1500 Guia Del Usuario página 17

7.5 CALCULATED FACTORS FOR BRIDGE MEASUREMENTS
7.5.1 Wire Gauges
For a temperature of 10°C, wire gauges given in mm.
0.20300 Ω/m
CU 0.32 -
0.13160 Ω/m
CU 0.40 -
0.08400 Ω/m
CU 0.50 -
0.05600 Ω/m
CU 0.60 -
0.05360 Ω/m
CU 0.63 -
0.03417 Ω/m
CU 0.80 -
0.02610 Ω/m
CU 0.90 -
0.02187 Ω/m
CU 1.00 -
0.01800 Ω/m
CU 1.27 -
0.13550 Ω/m
AL 0.50 -
0.09330 Ω/m
AL 0.60 -
0.07160 Ω/m
AL 0.70 -
0.05270 Ω/m
AL 0.80 -
7.5.2 Temperature Compensation Factor
0.391%/°C - Applied to all wires regardless of type
7.5.3 Metres to feet conversion 3.281 ft / m
7.6 BRIDGE SPECIFICATION
Except where otherwise stated, this specification applies at an ambient temperature of 20°C
0 to 190 Ω in steps of 0.1 Ω
Loop and Fault tests, with results
190 Ω to 2000 Ω in steps of 1 Ω
displayed in resistance:
Standard Conductor Gauges
Copper: 0.32, 0.4, 0.5, 0.6, 0.63, 0.9 & 1.27mm
Aluminium: 0.5, 0.6, 0.7 & 0.8mm
User Definable Gauge entered as Ω/m or Ω/ft
±0.2% ±1 digit from 0 Ω to 1 MΩ
Accuracy of Fault Reading:
(Km, W, Kft) ±0.2% ±3 digits from 1 MΩ to 5 MΩ
±0.2% ±6 digits from 5 MΩ to 10 MΩ
±0.2% of reading ±1 digit (on Ω)
Accuracy of Loop Reading:
Insulation Accuracy: ±2% of reading ±1 digit
Insulation Range: 0 to 19 MΩ in steps of 0.01 MΩ
19 MΩ to 200 MΩ in steps of 0.1 MΩ
Voltage to line: 100 V DC ±20%. The output is current limited
(100 µA) so as the load drops below 1 MΩ, the
voltage to line will approach 0 V as the load
approaches 0 Ω.
Current to line: 100 µA DC nominal
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