Whilst No-Trip testing at points on the final circuit will normally function with a high
level of accuracy, it should be noted that the low current measurement technique used
is more likely to be adversely aected by external factors such as noise on the mains
supply.
Circumstances such as testing at seldom used socket outlets with tarnished contacts or
testing a circuit with a lot of background noise from electronic apparatus can result in
the occasional erroneous reading.
For this reason it is recommended that multiple measurements are made when using
the No-trip mode and any isolated odd results are ignored. When taking multiple
readings the tester should be disconnected from the supply between consecutive tests.
For safety reasons the No-Trip mode is recommended for all measurements made on TT
systems.
The brown test lead can be substituted by using the red
remote test probe supplied. This allows remote
activation of the MFT5000 from the safety of the test
probe ensuring that you are always looking at the point
of contact and not the MFT5000.
Where practical all other equipment powered by the same circuit should be switched
o before testing. This will reduce the chances of the RCD tripping as a result of
combined leakages.
PFC/PSC
In both Loop test mode the Socket & See MFT5000 will also display the supply voltage
and at the touch of the PFC button the PFC/PSC depending on being connected L-E or
L-N will be displayed.
Test Lead Configuration
The Socket & See MFT5000 Loop test function can be used with 2 types of connecting
lead. It is important to understand and use the correct lead configuration for each test
mode or you may not obtain the correct results.
Lead Options
Socket & See SOC/PROLEAD mains lead with 3 x 4mm plug to 13A plug
Socket & See SOC/DLMPROLEAD 3-pole distribution board test lead set that can be
fitted with either prod tips or crocodile clips as required.
2 Wire lead configuration Brown (live) Blue(neutral) Green (earth) The neutral is
inserted into the back of the earth lead to give a combined contact for 2 wire test
method.
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