How To Make Full Use Of Blue Ring Tester
The reason I write this article is
because I often get emails from Blue Ring Tester buyers that they wanted help in the form of photos to guide
them how to use the tester. My job here is to simplify the process of testing the coils with the tester and hope
this article could help them to fully utilizing this meter for troubleshooting purposes.
So what is a Blue Ring Tester?
The Blue ring tester is an inexpensive and effective
way to test any high Q inductive component. It is especially useful for doing a quick check on Flyback
Transformers, B+ coils and other high frequency inductive components like Horizontal deflection yoke windings and
SMPS transformers. In other words the Blue Ring Tester is also a Coil Tester or a Shorted Turn
How does the ring tester work?
The components in many circuits
including display drivers, SMPS and tuning circuits contain low loss (high Q) resonant circuits. The testing
technique used in this design is based on the fact that many faults in magnetic components result in increased
loss = reduced Q. Ring testing gets its name from the fact that a when fast voltage pulse is applied to a high Q
circuit the tuned nature of the circuit will produce a decaying AC voltage of several cycles. More cycles, or
“rings”, mean higher Q. Few
or no cycles indicates a problem in
that component, a shorted winding or some other malady. This tester provides a quick and easy way to track down
Why do we
need Blue Ring Tester to test coils instead of using Ohmmeter and Inductance meter?
If you use an ohmmeter or even an
inductance meter to test a coil/winding then chances is very high you will not be able to repair the equipment.
Why? Because both meters could misled you into believing that a shorted coil/winding is good! That means a coil
with shorted turns in the winding could still show you a good Ohm reading and good Inductance value too. If you
miss those bad coils during troubleshooting then the rest of the
time you use to troubleshoot on other area or components will be wasted because the actual problem is in the
What this tester can do
1) Check the primary winding of
switch mode transformer in any electronic equipment.
2) Check B+ coil in CRT
Note: For your information B+
coil could also come in the shape like a horizontal driver transformer
3) Check the primary winding of
Horizontal driver transformer in CRT Monitors/Tvs
Click Here To Purchase The Blue Ring
4) Check the primary winding of
flyback transformer in CRT Monitors/Tvs
5) Check horizontal yoke coil
windings in CRT Monitors/Tvs
6) Check the degaussing coil in CRT
6) Check the ballast of fluorescent
7) Check the Primary and Secondary
Winding Of Linear Transformer
8) Check the high voltage transformer in LCD Inverter board
What this tester can’t do
Generally the higher the inductance
value the more LED from the tester will light up, assuming if there is no shorted turn in the winding. In other
words it can be used to check on coils that have at least .3milihenry and above. If the value is lower than that
then there will be less LED will light up and sometimes the LED may go off too. Usually the smaller the coil,
the smaller will be the inductance value. Below are the components that this tester can’t
1) It can’t be used to check on
small coils and ferrite bead because the inductance value is too small.
2) It can’t be used to check on
vertical winding in CRT Monitors/Tvs because the vertical winding is usually too low Q to respond to any ring
3) It can’t be used to check on
secondary winding of Switch mode and Flyback Transformer in CRT Monitors/Tvs because the inductance value is too
Is this the best tester to test a coil-does it has 100% accuracy?
The best tester to test a coil or
any other components is the equipment itself. The reason for that is
because the components (including of the coil) will go through all actual signals (voltage, current or
frequency) which any tester in the world also could not provide. For your information all components (which
include the coils) can breakdown when under full load thus no tester can claim to have 100% accuracy to really
test components unless the tester can actually apply all the right
signals to the components when under test.
Components that breakdown when
under load is not very common thus you should not worry about this. Assuming if you have doubt on the coil that
you have tested with the Blue Ring Tester, just directly replace and retest the set. You may also compare the
coil reading with another similar or quite similar machine for best result. For example, if you are a seasoned
repairer for LCD TV, then you should roughly know the reading of the
primary winding of switch mode transformer (in power board) and the windings of the high voltage transformer in
the inverter board.
Conclusion- Blue Ring Tester is a MUST for those of you who is in the electronic troubleshooting line. It has
the capability in testing coils in-circuit (without removing the coil out from the circuit) thus saving your
repair time. It is easy to test the coils because the test leads are non-polarized-that means you can test
the coils using either way from the test probes and directly read the result from the lighted LEDs. Lastly, it
is affordable too as compare to the price of the industrial type of winding tester in the market which can cost
several thousand dollars.
Click Here To Purchase The Blue Ring
Click Here To Learn How You Can Be A Professional In Switch
Mode Power Supplies Repair
Click here to learn how you can
become a Professional in Testing Electronic
Click here to learn how you can become a Professional in LCD Monitor
Recommended Mr Steve
Cherubino Laptop Repair Videos For Beginners!
Recommended Mr Kent Projection Television Repair Membership website-Visit
Recommended Mr Kent LCD TV Repair Membership website-Visit
Recommended Mr Kent
Plasma TV Repair Membership website-Visit Now!