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2. GENERAL DESCRIPTION
2.1.
INTRODUCTION
Dear Customer, we thank you for your patronage. The instrument you have just purchased
will grant you accurate and reliable measurements provided that it is used according to the
present manual's instructions.
The instrument was designed to grant the user the utmost safety conditions thanks to a
new concept assuring double insulation and over voltage category III.
2.2.
FUNCTIONS
The instrument is able to perform the following tests:
LOWΩ:
Continuity Test of Protection and Equalising conductors with test current
higher than 200mA and open circuit voltage ranging from 4V to 24V.
MΩ:
Measurement of insulation resistance with DC test voltage 50V, 100V,
250V, 500V or 1000V.
RCD:
Measurement on common and/or selective RCDs AC type (
A type (
Under this mode the instrument can measure the overall earth
resistance without causing RCD tripping.
LOOP
:
Measurement of line and fault loop impedance with calculation of
prospective short circuit current, Measurement of fault loop impedance
between phase and earth and Global Earth resistance measurement
without RCD tripping and calculation of prospective short circuit
current, Indication of phase rotation sequence
EARTH
Measurement of Earth Resistance and Resistivity using Earth rods.
AUX:
Measurement and Recording of leakage current using flexible clamp.
ANALYSER:
The Instrument allows the following operations:
Display in real time the electrical parameters of a single phase
systems and the harmonic analysis of voltage and current.
Conduct a direct Energy measurement (without memorizing).
Memorize (pressing SAVE key) the sampled values of the Parameters
present at instrument input generating a "Smp" record inside
instrument memory. It will be possible to analyse the memorized
data ONLY by transferring the data to a PC.
Record simultaneously (pressing the START key after a proper
setting): RMS values of voltage, current, corresponding harmonics,
active, reactive and apparent powers, power factors and cosϕ, active,
reactive and apparent energies, voltage anomalies (voltage sag and
surge) with 10ms resolution. It will be possible to analyse the
recorded data ONLY by transferring the data to a PC.
Please note the difference between memorize and record. These terms
will be used repeatedly in this manual. Please focus on their definitions and
distinctions.
) of the following parameters:
Tripping time.
Tripping current.
Contact voltage (U
).
t
Global earth resistance (R
CAUTION
Page 7 of 131
).
a
VR2250
) and
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