What Is a Continuity Tester?
A continuity tester is a testing device used to connect various cables, harnesses, and connectors for the purpose of verifying electrical connectivity. It rapidly checks whether cables and other components are electrically connected as expected at both ends.
Typically, the tester is housed in a compact chassis and features an LCD panel on the front, a lamp for displaying test results, a start button, and buttons for configuring test parameters. On the back, you will find connectors for attaching the cables to be tested.
Additionally, on the rear side, there are several connector terminals designed for connecting cables. Some testers also have the capability to print test results using a printer.
It is worth noting that while these devices are commonly referred to as “continuity testers,” we will specifically focus on the types of testers mentioned above.
Uses of Continuity Testers
Continuity testers can be controlled from a PC, allowing for detailed configuration of test parameters and test item control, which helps streamline preparation and reduce overall testing time.
Some continuity testers are capable of simultaneously testing cables, harnesses, and connectors with 100 or more pins, further enhancing their efficiency.
These testers verify correct wiring between terminals, including cables and connectors, by applying a relatively low voltage and measuring the resulting current flow between the terminals.
Principles of Continuity Testers
In addition to the previously described continuity testing, certain continuity testers are equipped to perform withstand voltage testing, insulation resistance testing, and instantaneous disconnection testing.
Withstand voltage testing evaluates the insulation between terminals by applying a reduced voltage between different terminals and checking for any sparks or other abnormal phenomena.
Insulation resistance tests ensure that the insulation resistance between terminals meets the specified requirements for cables and connectors.
The instantaneous disconnection test is conducted while cables and connectors are placed in specific positions during the normal continuity test. This test can detect momentary disconnections, even if the pins in the connector are poorly soldered or if the cable is partially damaged, by applying vibrations to the cable or connector.
As explained earlier, some continuity testers integrate continuity testing with withstand voltage testing, insulation resistance testing, and instantaneous disconnection testing. These tests are programmable on the PC side and can be performed automatically and sequentially.
The test procedure, configured on the PC, is transmitted to the device. Once the setup is complete, the cable or connector to be tested is connected to the continuity tester, and the tests are executed sequentially.