Megger MTB7671 Calibration Test Box

Megger MTB7671 Calibration Test Box Details

Take this calibration box with you wherever you go to check the ongoing accuracy of insulation, continuity, loop and RCD testers.

Built inside its own protective carrying case, the Megger MTB7671 ensures that your tester remains accurate and within specifications during the time period between official calibration procedures. This makes sure that your tester operates safely and doesn’t generate inaccurate results (plus ensures compliance with such bodies as the NICEIC, ELECSA and Corgi).

The instrument is capable of checking the full range of a tester’s capability and even includes colour-coded sections for easy identification of testing procedures and clearly indicates whether the connected tester has passed or failed the test.

Megger MTB7671 Calibration Test Box Key Features

  • Tests the full range of a tester’s capabilities to ensure measurement accuracy is maintained
  • Designed not to trip RCD-protected circuits
  • Tests in line with BS7671, BS EN 61557 and IET On-Site Guide regulations
  • Suitable for use with insulation, continuity, loop and RCD testers
  • Colour-coded interior for easy testing
  • Built inside its own protective hard transportation case
  • Insulation testing – the MTB7671 verifies voltage and current for 250V, 500V and 1kV voltage points plus additional 9MΩ and 90MΩ test values
  • Continuity testing – verifies that the correct open circuit voltage (4-24V) and short circuit current (>200mA) are present. 0.5Ω and 5Ω test values also included for resistance measurements
  • Loop testing – provides direct loop measurement from outlet socket with trip or no-trip testing procedures
  • RCD testing – 10ma, 30mA and 100mA testing values
  • Voltage measurements – this tester can check the voltage measurement range of an instrument

What’s Included?

  • Megger MTB7671 Calibration Test Box
  • 10 x Test Record Cards

Additional cards and labels can also be supplied. Contact us directly if you’re interested in these additional items.

Megger MTB67671 Technical Specifications

BS7671 & BS EN61557 Tester Requirements MTB7671 Test Parameters Megger Calibration Points
Continuity Short Circuit Test Current >200mA >200mA
PASS/FAIL indication
(threshold limits ±2%)
Continuity Test Voltage Range 4V – 24V 4V – 24V
PASS/FAIL indication
(threshold limits ±2%)
Continuity Resistance 0.5Ω ±3% 0.5Ω
Insulation Test Current 1mA 1mA
PASS/FAIL indication
(threshold limits ±2%)
Insulation Test Voltages 250V +25% max
500V + 25% max
1kV + 25% max
250V + 25%
500V + 25%
1kV + 25%
PASS/FAIL indication
(threshold limits ±2%)
Insulation Test Resistance 0.25MΩ min
0.5MΩ min
1MΩ min
0.25MΩ ± 3%
0.5MΩ ± 3%
1MΩ ±3%
9MΩ ± 3%
90MΩ ±3%
Loop Local mains impedance
Loop + 1Ω Loop + 1Ω (±5%) 1.0Ω
Loop + 180Ω (IET On-Site Guide 10.3.5 Earth Electrode Resistance) Loop + 180° (±5%) 180Ω
RCD Currents (I) 10mA, 30mA and 100mA
RCD No Trip (1/2 I) No trip >1999ms
RCD (I) <200ms 40ms @ 0°
50ms @ 180°
RCD (5 x I) <40ms 10ms @ 0°
20ms @ 180°

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