These Major Megger® Extended Range Insulation Resistance Testers are the ideal instruments when high ranges are needed for measuring insulation resistance. Both provide excellent test voltage regulation and an external guard terminal to eliminate surface leakage current from the measurement. The instruments are all electronic; they generate a regulated dc high voltage and use low-zero-drift, high-accuracy circuits, with high current sensitivity. Designed for portability, each is enclosed in a molded, impact-resistance, flame-retardant case.

Both instruments are protected for connection to power distribution systems up to 300 V Line-Ground and 500 V Line-Line for Installation Category III. This relates to transient overvoltage likely to be found in fixed installation wiring.

Cat. No. 210600

This digital, autoranging model provides insulation resistance readings up to 1999 MΩ. It has a 0- to 600-volt ac measuring range. Test voltages of 100, 250, 500 and 1000 volts dc are selected by a rotary switch, and insulation resistance to 1999 MΩ autoranging can be made on the 500 and 1000 V ranges. It incorporates a 3-1/2 digit LCD calibrated directly in megohms, ohms and ac/dc volts.