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
Cat. No. 210170
This unit provides high-resistance readings up to 20,000
Mohm. It features an analog meter movement calibrated
directly in megohms, ohms and ac volts. Test voltages of
100, 250, 500 and 1000 volts dc are selected by a rotary
switch. Insulation resistance measurements up to 20 Gohm
can be made on all voltage ranges.
The unit is also equipped with a 0- to 5000-ohm continuity
range and a 0- to 600-volt ac or presence of dc voltage
measuring range. Power is supplied by an ac generator,
driven by a hand crank, through a gear train.
Cat. No. 210600
This digital, autoranging model provides insulation
resistance readings up to 1999 Mohm. 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 Mohm 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.