The Fluke 1503 Insulation Resistance Tester is used to measure the insulation resistance of electrical systems, wiring, cables, motors, and other equipment. It is commonly used in electrical maintenance, troubleshooting, and installation tasks to verify the integrity of insulation and identify potential issues.

Here are some key features of the Fluke 1503 Insulation Resistance Tester:

1. Insulation Resistance Measurement: The tester is capable of measuring insulation resistance up to 2000 megohms (2 gigohms) with a test voltage of 500 volts DC. This allows for quick and accurate assessment of insulation conditions.

2. Test Voltage Selection: The instrument provides selectable test voltages of 250V, 500V, and 1000V, allowing flexibility in measuring different insulation resistance ranges.

3. Diode and Continuity Testing: In addition to insulation resistance measurement, the Fluke 1503 also offers standard multimeter functions such as diode testing and continuity testing. This makes it a versatile tool for general electrical testing and troubleshooting.

4. Potential Leakage Current Measurement: The tester can measure potential leakage current up to 1 milliampere, enabling the detection of abnormal current paths or leakage in the insulation.

5. Auto-discharge Capability: After insulation resistance testing, the instrument features an automatic discharge function that safely discharges any capacitive voltage present in the circuit being tested.

6. User-Friendly Interface: The Fluke 1503 is designed with a simple and easy-to-use interface, typically featuring a clear LCD display, intuitive controls, and selectable test modes for efficient and hassle-free operation.