MODEL 3711/3731 SERVICE/CALIBRATION MANUAL Cat. #2117.60/2117.61
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CALIBRATION EQUIPMENT
REQUIRED ITEMS:
For Field Calibration: (resistance values only)
Each ground resistance tester is supplied with a calibration loop to check and calibrate it. This loop
does not allow calibration above 198Ω. The typical range of measurement of ground resistance is less
than this value.
• One DC power supply adjustable from 5.6V to 10V (0.2A min.)
• Four resistors:
20Ω, 120Ω, 150Ω, 500Ω (Accuracy 0.25%)
• One AC Current generator to supply 1.4A, 50 or 60Hz (Accuracy 0.25%)
• One small insulated flat screwdriver.
For Laboratory Calibration: (including amps range):
Add the following items:
• One decade resistance box, accuracy 0.25% (non-inductive) adjustable from 0.01Ω to 500Ω.
• One AC current generator capable of supplying 100mA to 20A into a two turn wire loop with a
frequency of 50 to 400Hz. (Fluke 5500 or 5520).
• One DMM 20000 cts (Accuracy: < 0.1% in DC) and (< 0.5% in AC).
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