Insulation Resistance Tester — 500V

Your multimeter tests continuity. That is not the same question as whether the insulation on a rewound motor will hold off mains voltage. Before you plug anything back in, you want to know the answer to the second question. That is what this does.

Specifications

• Range: 0.01 MΩ to 2 GΩ
• Test voltages: 250 V / 500 V DC, selectable
• Display: 3.75-digit backlit LCD
• Auto-discharge: Yes — bleeds stored charge after every test
• Leads: 3 ft IEC 61010 silicone, alligator clips included
• Power: 6× AA batteries, included
• Case: ABS with rubber bumpers
• Weight: 1.3 lb / 590 g
• Warranty: 1 year through our shop

What it's for

Rewound motors, rewound transformers, repaired appliances, vintage equipment coming back into service. Apply 500 V DC across the winding and ground, read the resistance. A healthy winding reads hundreds of megohms or better. A winding with compromised insulation tells you before the breaker does.

The auto-discharge circuit bleeds the stored charge off the winding after each test — you don't have to remember to do it, and you don't get bit by a capacitively charged coil when you pull the leads.

Honest note

Hobbyist grade, not lab calibrated. If you're doing certification work or writing test records for a regulated environment, you need a different category of instrument. For making sure your rewound bench grinder won't bite you when you flip the switch, this is the right tool at the right price.