AEMC 1045 Digital Megohmmeter, 250/500/1,000V Test Voltages, 2,000 Megohms Insulation Resistance, 400 Kilohms Low-Resistance, 600V Voltage

The AEMC 1045 digital megohmmeter is an auto-ranging insulation tester with a voltage safety check and three test voltages—250, 500, and 1,000V—for measuring insulation resistance to 2,000MΩ to indicate the condition of windings or cables in motors, switchgears, electrical installations, and other insulated equipment, and it also measures low-resistance to 400kΩ and AC and DC voltage to 600V, disabling insulation testing when a voltage greater than 25V is detected. The timer mode enables timed insulation resistance measurements, sounding a buzzer at appropriate intervals so the user can calculate the PI (polarization index) and DAR (dielectric absorption rate) which give a truer indication of insulation condition than single-point measurements. High and low thresholds for insulation and resistance measurements can be set, triggering an alarm when readings fall outside the settings, and will be retained even after the meter is powered off. When measurement is complete, the meter enters voltage detection mode and automatically discharges residual voltage from the circuit under test. The meter can perform a continuity check up to 20Ω and buzzes to confirm that a circuit conducts electricity. It has a 4,000-count LCD with a backlight for visibility in low light that automatically turns off after one minute. The display shows readings numerically and on a 34-segment bar graph. This auto-ranging meter automatically selects the appropriate operating range for measurements. It is rated for category (CAT) II installations to 300V, which covers energy-consuming equipment connected to a fixed installation, including household, office, and laboratory appliances. The unit automatically turns off after five minutes of non-use to conserve battery life and has a low-battery indicator that signals when the batteries need to be replaced. It comes with a set of test leads, a set of alligator clips, a test probe, six 1.5V AA batteries, a soft carrying case, and instructions. Megohmmeters are commonly used for electrical maintenance and testing in industries such as HVAC, transportation, manufacturing, mining, and utilities, among others.

Specifications

*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back

Megohmmeters, also called insulation testers, are electrical test meters that measure resistance to the flow of current in an electrical component or circuit and check the continuity of an electrical circuit to detect electrical problems such as degraded insulation and improper circuit connections in equipment, wiring, and power supplies. Resistance is an indicator of the overall condition of the device being tested. Megohmmeters have an internal power supply, such as a battery or a capacitor, which supplies a test voltage to a circuit or component that is turned off. Test leads are connected in a series to the tester and the circuit or device being tested. The meter calculates the difference in voltage between the leads and measures the resistance. Most megohmmeters have two terminals for test lead attachment. The two-terminal, or two-wire, measurement method includes the resistance of the circuit or device being tested and the resistance of the test leads, and generally provides sufficient accuracy for measuring large values of resistance in insulation testing applications.

AEMC Instruments manufactures electrical testing and measurement instruments, including clamp meters, power quality analyzers, ground resistance testers, and data loggers. The company, founded in 1893, is headquartered in Foxborough, MA.

What's in the Box?

• AEMC 1045 digital megohmmeter
• Set of test leads
• Set of alligator clips
• Test probe
• (6) 1.5V AA batteries
• Soft carrying case
• Instructions