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5478
TΩ Meter (5kV Insulation Tester)
TΩMeter 5478 is a digital multipurpose tester
intended for testing, analyzing, inspecting and
periodic maintaining of any high voltage insulations.

F e atu re s
Insulation Resistance measurement
-

The main reasons why insulations fail are due to
excessive heat, moisture, dirt, vibrations and aging.
To detect such deteriorations in order to initiate
preventive maintenance procedures it is necessary
to perform regular resistance tests.

Measuring range up to 5 TΩ.
Programmable timer 1s… 30 min.
Capacitance measurement up to 50 µF.
Programmable test voltages 250V… 5kV.

Step-up Voltage measurement
- 5 test voltage steps automatically set within
selected test voltage range.
- Programmable timer 1s… 30 min / step.

The total current in the body of an insulation
system consists of leakage currents, charging
currents and absorption currents. These currents
are time dependent. At the start of the
measurement the current is mostly dominated by
the capacitance charging current. About one minute
later the capacitance is charged and the total
current is mainly based by absorption current,
which is caused by molecules that polarize.
The absorption current typically collapses after a
few minutes and if no surface leakage is present
the current consist only of leakage current, which
should be stable.

Withstand voltage measurement
-

Programmable ramp test voltage 250V… 5kV.
High resolution ramp (approx. 20V / step).
Leakage current measurement.
Programmable threshold current 1uA… 1.4mA.

Voltage and frequency measurements
- Up to 600 V AC/DC, 45...65 Hz.
Diagnostic measurements
- Measured on DUT are discharge current, voltage
and capacitance.
- Calculated polarization index.
- Calculated dielectric discharge ratio.

The TΩMeter 5478 offers a complete set of
functions to measure and detect effectively all parts
of current in an insulation system. The instrument
can supply an output power of 5 W and a test
voltage of up to 5000 V and therefore measure
insulation resistances up to 5 TΩ.
Additionally the TΩMeter performs step-up voltage
measurement, withstand voltage measurement,
AC/DC voltage and frequency measurements up to
600V as well as diagnostic measurement functions.

B en ef i ts
Guard terminal eliminates surface leakage from the
measurement.
Battery or mains operation, built-in battery charger.
Data exchange to external PC over built-in RS232
interface and supplied application software.

The instrument is fully automatic and requires no
measuring range adjustment. A large dot matrix
LCD displays measuring values and test progress at
a glance. Built-in memory allows the storage of up
to 1000 measurement results. Test reports can be
sent over a RS-232 interface to an external
computer.

Lightweight, rugged and reliable design.
Automatic discharge of capacitive loads.
User-friendly operation allows simple, fast and safe
measurements without much precognition.
Five different measuring modes in one instrument
ensure cost-effective investment.

Ap p lic a tion s
Power Transformers
Distribution Transformers
Instrument Transformers
Rotating Machines
Bushings
Cables
Surge Arresters
Insulation systems

Subject to technical modifications without notice.

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