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Major tech MT390 - Measurement Specifications (cont.); LOOP Resistance (No Trip) Specs; LINE Resistance Specs; RCD Specifications

Major tech MT390
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6
1.7. ERROR CODES
• Various error conditions are detected by the tester and are indicated
with the icon, "Err", and an error number on the primary display.
• These error conditions disable testing and, if necessary, stop a running
test.
Error Condition Code Code Solution
Solution Fault Voltage 1 Check the installation, in particular, the
voltage between N and PE.
Over Temp 2 Wait while the tester cools down.
Excessive Noise 3 Switch off all appliances (Loop, RCD
measurements) and move the earth stakes
(earth measurement).
Excessive Probe 4 Put the stakes deeper into the soil; Tamp
down the soil directly around the stakes;
Pour water around the stakes but not at
the earth ground under test.
Self Test Fails 5 Return the tester to a Service Center.
Resistance
2.1. SPECIFICATIONS
2. SPECIFICATIONS
Function Range Resolution Accuracy
LOOP Resistance 0.23 to 9.99Ω 0.01Ω
±(4% of reading + 6
L- PE (Hi-Amp) 10.0 to 99.9Ω 0.1Ω
digits)
100 to 999Ω 1Ω
Measuring Current: 8.0A to 25.0A.
Range of the Voltage Used: 195VAC to 260VAC (50,60Hz).
Function Range Resolution Accuracy
LOOP Resistance 0.23 to 9.99Ω 0.01Ω
±(5% of reading + 6
L- PE (No Trip) 10.0 to 99.9Ω 0.1Ω
digits)
100 to 999Ω 1Ω
Measuring Current: <15mA.
Range of the Voltage Used: 195VAC to 260VAC (50,60Hz).

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