Introduction:
An OBD-II code
reader is an electronic device that allows you to plug into your computer's OBD
diagnostic port and access technical information.
Check out the
other Frequently Asked Questions for more information on OBD.
The reader allows
you to view any stored diagnostic trouble codes (DTC's), which aids in
troubleshooting problems with cars and trucks.
OBD code readers
come in a variety of shapes and sizes. Some work in conjuction with a laptop computer
and software.
In those cases,
you basically get a cable and software.
In other cases,
the unit is handheld and does all the same functions, but in one neat, portable
package.
Features:
The features of
each OBD code reader depends on the make and model.
However, it is
common for most readers to have:
LCD screen
readouts
View diagnostic
trouble codes (DTC's)
Ability to reset /
clear DTC codes
Get
"snapshot" data so you can view what was going on when the code was
triggered
Higher-end OBD
code readers can have more advanced features such as:
Languages other
than English
Code definitions
right on the unit
Display freeze
frame data
In addition, some
manufacturers sell performance chips/tuners that include the OBD code reader
feature.
Pricing:
OBD-II code
readers vary in price.
They range from an
affordable price ($19.99) to many hundreds of dollars, or more.
Photos:
More Information:
If you're
interested in getting more information on OBD-II code readers or are interested
in purchasing one,
check out complete
list of Frequently Asked OBD Questions, and also the ads throughout this site.
Some brand names
of OBD readers are Carsara, Cartrend, Actron, Innova, etc.
Reference Links:
Obdii Code Reader,Auto Scanner ,Fault Code Reader ,Automotive Health Scanner Shenzhen Cartrend Technology Co, Ltd , https://www.cartrendthings.com
How to connect current transformer and reactive power meter
Current transformer connection is not complicated, only four wiring forms.
1. It is the wiring form of a single current transformer.
Can only reflect the situation of single-phase current. It is applicable to the need to measure the balance of one-phase current or three-phase load. When one phase is measured, the three-phase condition can be known, and most of the ammeters are connected.
2, three-phase complete star wiring and delta wiring form.
The three-phase current transformer can accurately understand the three-phase load changes in time, and is often used in transformer differential protection wiring. Only use three-phase complete star-wired current acquisition for watt-hour meters in a direct neutral grounding system. The three-phase three-relay connection method can not only react to various types of phase-to-phase short-circuits, but also can react to single-phase ground short-circuits. Therefore, this wiring method is used for the protection of phase short-circuit protection and single-phase ground short-circuit in the neutral point direct grounding system.
3, two-phase incomplete star wiring form.
It is used most in practical work. It saves one current transformer and uses the combined current of phase A and phase C to form an inverting phase B current. The two-phase dual-relay connection method can respond to phase-to-phase short circuits, but it cannot fully respond to a single-phase ground short circuit, so it cannot be used for single-phase ground protection. This wiring method is used for neutral point ungrounded systems or arc suppression coil grounding systems for phase-to-phase short-circuit protection.
4, two phase difference current wiring form.
It is also used only in three-phase three-wire circuits. The neutral point is not grounded, and there is no neutral line. The advantage of this type of connection is that it not only saves a current transformer, but also uses a relay to reflect the various types of three-phase circuits. Phase-to-phase short-circuit faults, that is, three-phase overcurrent protection with minimal relays, save investment. However, when the failure mode is different, the sensitivity is different. This type of wiring is often used for phase-to-phase short-circuit protection in distribution networks up to 10kV. Due to the low sensitivity of this type of protection, modern times have rarely been used.