Promax PE-425, User Manual, Page: 9 / 20

USER’S MANUAL. PE-425
05/2015 Page 5
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3. PRODUCT LAYOUT AND OPERATING
3.1 Description
The Electrical Network Analyser consist of two internal current injection devices,
current and voltage measurement circuits and a microprocessor connected to a display.
Once the user depress the button, power is applied to the tester’s circuit. The
PE-425 is
a new type of Multifunction Instrument which test and report on all important
components of a basic electrical network.
Conventionally, when you had to analyze an electrical network or find a fault
quickly, the electrical engineer had to buy many bulky and expensive test instruments.
This latest release of the
PROMAX Electrical Network Analyzer, model PE-425 solves
that problem. The PE-425 has a built-in LED wiring check which checks the correctness
of the wiring under test. This microprocessor controlled, superb piece of equipment that
has
one “Smart” push button -does it all- type.
Press it to turn the instrument “ON”, press it to TEST, press it to SCROLL through
the results, press it to scroll through PREVIOUS results or press it to START an other
test.
The
PE-425 is so simple to use that you can focus on solving rapidly the electrical
problem instead of having to study the instruction manual.
This Electrical Network Analyser uses “
multiple paths high current injection “ for its
test so that the measured values are well above network noise and high current
injection is closer to reality. Once the integrity of the wiring has been verified, the
“Smart” button can be depressed. The instrument will first measure the
voltage of the
electricity supplier (utility company) at the source. (V
G
). A high current is then injected
between Line and Neutral from the point where the test is performed.
All the results (voltages and currents) from this measure-ment are stored in a RAM
inside the microprocessor. Then, a high current is injected between Line and Earth from
the same test point (fully automated, the user’s has nothing to do), currents and
voltages are again measured and stored. From now, the microprocessor has enough
information to compute all the necessary results to display. The “Smart” button can be
depressed to scroll through the relevant information and results.
With the PE-425 , the electrical technician can quickly ascertain if the network is
healthy or if a problem is present in the Line, Neutral or Earth path of the network.
The Earth path is measured and calculated without the need for poles or long wires.
The Earth path shown on the instrument is exactly what the earth current will be
going through. Prospective Short Circuit Current and Loop Impedance between Line-
Neutral and Line-Earth and all their components are shown.