PeakTech 2755 Bedienungsanleitung Seite 59

Continuity
Low Ohm
mA
Beeper
Zero
(RE)
RE
Zero
Isolation
resistance
Terminal
Voltage
Insulation
Beeper
Lock
Reference
A continuity test is used for checking of intact compounds in a non-
active circuit. If all modules are connected correctly, the resistance
should be as low as possible. When corroded, charred or badly
screwed connections, the resistance is higher (contact resistance),
which can ultimately lead to fire. Various limits (0.5, 1, 2.5 and 10
) can be set.
The current display of "Continuity" shows the used test current.
The beeper (buzzer) gives an audible signal when the measured
resistance is below the set limit.
The zero function (zeroing) measures the inherent resistance of the
test leads and subtracted to obtain this value from the loop
impedance for precise measurement results.
In order to protect an electrical system, it should be properly
connected to the earth grond potential. In the event of a fault
current via the PE grounding can be derived in the ground, which is
important for the bonding or lightning protection. The earth
resistance testing detects the conductivity of the soil, which helps
for the determination of the ground materials used (earth rods,
foundation earth electrode etc.).
The zero function (zeroing) measures the inherent resistance of the
test leads and subtracted to obtain this value from the loop
impedance for precise measurement results.
In case of faulty insulation of a live conductor can result in risk of
fire due to leakage or danger to humans and animals through
voltage flashovers. To prevent this, isolation tests are carried out in
the electrical equipment.
The test voltage for the insulation test can be set to 125, 250, 500
or 1000V, and should be selected according to the mains voltage of
the test object.
The beeper (buzzer) gives an audible warning, while the insulation
test is performed.
The insulation test is performed only while the TEST button is held
down. If the LOCK is activated, the test however continues to be
performed by a single button hit, until the TEST button is pressed
again.
The reference value for the insulation measurement can be set to
0.125, 0.25, 0.5 and 1.0 M ohms.
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