System Details - Raytech WR14 Instruction Manual

3.3 System Details

System Check:
The instruments are line operated
power sources between 90 to 264VAC 47...63Hz. The systems perform a self-check each
time that they are powered on. The User should always visually inspect all connectors,
cables and devices to be measured to avoid any safety issues.
Limitations of Winding Resistance Testing:
In general, there are no limitations on testing low or high inductive windings of transformers.
The test systems are specially designed to test all transformer windings.
Discharging the Transformer windings:
The WR systems are specialized systems designed to measure Transformer windings. These
systems are equipped with heavy-duty discharge circuits that are very unique in design.
The internal discharge circuit dissipates the stored energy in the transformer windings with a
"Constant Power Discharge Circuit" that is unique to all transformer winding test systems.
That is the reason why Raytech systems can discharge transformers more than 10 times faster than
any other system on the market.
If a cable happens to fall off during test, the system will STILL discharge the test object safely with
the automatic Constant Power Discharge Circuit.
The Potential Test Leads are part of the safety circuit and have the ability to discharge a transformer
should one of the current leads become detached.
DO NOT USE A SMALLER GAUGE POTENTIAL CABLES (Channel 1, 2, or 3) THEN THE
ORIGINAL RAYTECH CABLES SUPPLIED!
Low Resistance Testing:
The WR series of test instruments utilize a 4 wire measuring technique for each Channel.
The points where the potential leads are connected determine the resistance reading.
The test set employs a very simple principle of Ohm's law:
R 
1
The WR14 is also battery operated additionally to the line operation
Instruction Manual Winding Resistance Meter
Type WR50, WR14, Version 2.01
1
. The systems are designed to be used with AC Voltage
U
I
R = Resistance
U = Voltage
I = Current
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