The Fluke highvoltage digital megohmmeter is an insulation tester with preset and adjustable test voltages for measuring insulation resistance to 1TO (2TO for 10kV models) to indicate the condition of windings or cables in motors, switchgears, electrical installations, and other insulated equipment, and it also measures leakage current to 2 milliamperes (mA), capacitance to 20F, and AC and DC voltage to 600V, signaling when a voltage greater than 30V is detected. In addition to the preset test voltages of 250V, 500V, 1,000V, 2,500V, 5,000V, plus 10,000V for the 10kV models, test voltages can be adjusted in 50V increments to 1,000V and 100V increments above 1,000V. Its PI/DAR (polarization index/dielectric absorption rate) function automatically calculates PI and DAR, which are measurements over time that give a truer indication of insulation condition than singlepoint measurements. The meter can perform timed tests up to 99 minutes, adjustable in 1minute increments, and has storage for up to 99 test results. Stored results can be uploaded to a PC with the included FlukeView Forms Basic software. The software is compatible with Microsoft Windows 2000, XP, and Vista. For improved accuracy during highresistance testing, the guard terminal eliminates interference from leakage current. The meter has an LCD that shows the reading numerically and in a bar graph. Megohmmeters are commonly used for electrical maintenance and testing in industries such as HVAC, transportation, manufacturing, mining, and utilities, among others.The meter is rated for category (CAT) IV installations to 600V, which covers equipment at the origin of the installation, such as electricity meters and primary overcurrent protection equipment, and CAT III installations to 1,000V, which covers equipment in fixed installations, such as switches in the fixed installation and some industrial equipment that is permanently connected to the fixed installation. The unit has a lowbattery indicator that signals when the battery needs to be replaced and automatically turns off after 30 minutes of nonuse. It comes with a set of test cables with alligator clips, a set of heavy duty alligator clips (for kit and 10kV models), an infraredtoUSB interface cable, FlukeView Forms Basic CDROM, rechargeable 12V leadacid battery (installed), an AC power cord for charging the battery, instructions, a soft carrying case (only for models without kit), a hard carrying case (only for kit models), and a certificate of calibration (only for kit models). Specifications Maximum insulation resistance measured1TO for Fluke 1550C; 2TO for Fluke 1555Test voltages250V, 500V, 1,000V, 2,500V, 5,000V; also 10,000V for Fluke 1555Maximum leakage current measured2mAMaximum capacitance measured20FMaximum AC and DC voltage measured600VInstallation ratingCAT IV, 600V; CAT III, 1,000VStandards metEN safety standards 610101 and 61557; CE marking; CSA and TV certificationPowerRechargeable 12V leadacid batteryWeight3.6kg/7.94 lb.Dimensions (H x W x D)*170 x 242 x 330mm/6.7 x 9.5 x 13 inches*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 me