MS5908 TRMS voltage GFCI RCD Tester Circuit Analyzer
Peak Line Voltage
% Voltage Drop
Neutral & Ground
RCD Trip Time
RCD Trip Current
GFCI Trip timer
GFCI Trip Current
Fault localization and trouble shooting for voltage problems
Normal measurement result
Fault measurement result
The voltage is too high or too low.
The circuit is overloaded.
Redistribute the circuit load.
High impedance points are found in switchboard or circuit.
Locate the high impedance and repair or replace relevant parts.
The supply voltage is too high or too low.
Consult the power supply department
Voltage to earth of zero line
Find the current source: Is there any multipoint ground? Does the equipment or device leak current?
Check and redistribute the load
Increase neutral line conductor, install electrical filter or use other methods to reduce the harmonic interference.
Consult the power supply department.
The electron device in the circuit results in the electric wave distortion.
Revaluate and relocate (if necessary) the electronic device in the circuit
The frequency is too high or too low.
The supply frequency is too high or too low.
Consult the electricity department
Fault localization and trouble shooting for voltage drop
The voltage drop is too high.
Redistribute the circuit load
Compared with power transmission length, the wire is small.
Rearrange the wire in compliance with the relevant standard.
High impedance point exists between the circuit and switchboard.
Repair or replace the parts generating high impedance
Fault localization and trouble shooting
Conductor impedance for live line and zero line
No. 14 line (2.0mm2)
The impedance is too high
No. 12 line (3.3mm2)
The wire diameter is too small for the power transmission length.
Check the wire diameter and rearrange the wire accordingly.
No. 10 line (5.2mm2)
High impedance point exists in the circuit or switchboard.
Locate the high impedance and repair or replace the parts
Conductor impedance for earth line
For personnel safety
Check the wire diameterand rearrange the wire accordingly.
For equipment safety
RCD is triggered within the specified time.
Fail to be triggered within the specified time.
The RCD is installed improperly.
Check the circuit and install the RCD according to the manufacture requirement and relevant standard.
Fail to be triggered (Invalid test)
RCD goes wrong.
Repair or replace RCD.
GFCI is triggered within the specified time.
The GFCI is installed improperly.
Check the circuit and install the GFCI according to the manufacture requirement and relevant standard.
GFCI goes wrong.
Repair or replace GFCI.
(2) Power adapter;