What Is a Circuit Tester?
Circuit testers are tools used to measure the current, voltage, resistance, etc., of in-vehicle electrical components and batteries. Unlike current detection testers, which can only tell whether current is flowing, circuit testers can measure even numerical values such as measured current and voltage. There are two types of testers: analog testers that display these values with a needle and digital testers that show the numerical values on a monitor.
Uses of Circuit Testers
Circuit testers are used primarily for vehicle maintenance. They not only detect the energized positive wire but can also identify the negative wire and check current consumption. This capability is essential when installing a fuse of the appropriate amperage, ensuring safe and efficient operation. Additionally, circuit testers are valuable tools for verifying that relays and switches do not exceed their allowable current values.
Principles of Circuit Testers
Circuit testers are designed for convenience and ease of use, featuring a large rotary switch with 2000 counts and Japanese notation. They offer a manual DMM with a wide measuring range and include a backlight for measurements in dark environments. The testers’ DC10A range is equipped with an LCD for clear visibility. They automatically detect and measure voltage and resistance and can locate live wires in walls and ceilings. Their large, clear display ensures easy readability.
A single circuit tester unit is versatile enough for various electrical system checks, including measuring engine RPM for both direct ignition and high-tension cord types. The ultra-thin, lightweight design of the DMM makes it easily portable, and the color-coded range and switch system enhance user-friendliness. Furthermore, the holster with a test lead fixing function is convenient for measurements in challenging environments.
These testers are capable of performing a wide range of measurements, such as battery voltage, alternator charge current, and dark current. They are also useful for water temperature sensor checks, continuity tests, diode tests, noise prevention capacitor checks, and various resistance checks. Additionally, their ability to measure temperature makes them suitable for tasks like checking the temperature of air conditioner vents.