IET Labs offers a choice of megohmmeters to fit many high-resistance measurement needs. Although these two megohmmeters, the GenRad 1863 and the GenRad 1864, are similar in appearance and accuracy, their operating ranges differ to match differing needs in the laboratory and production area.

1863/1864 Megohmmeter Datasheet and Specifications

Choice for production and inspection: The GenRad 1863 Megohmmeter is the choice for production and inspection tests. The GenRad 1863 will measure resistance at any of five common test voltages up to 500VDC, has fewer controls, and is the lower priced model. It is the best selection for those applications requiring a lesser voltage and resistance range.

Choice for laboratory investigations: The GenRad 1864 Megohmmeter is the choice for more demanding applications. It is the more flexible of the two instruments. The test voltage can be set to any value from 10VDC to 109VDC in 1-volt steps and to 1090VDC in 10 volt steps. Thus the GenRad 1864 can be set to any common, or uncommon test voltage for ceramic, mica or paper capacitors, or other devices. The reverse resistance of rectifiers can be readily measured; the low test voltages are especially useful in measuring solid state diodes. An additional range on the 1864 Megohmmeter permits measurements up to 200 TΩ (2 x 10¹⁴Ω)

Both megohmmeters are easy to use with direct-reading meter indication and lighted range switch that shows the multiplier for each range and voltage. The maximum current possible at the terminals is limited to a 5mA and a panel light near the terminals warns when voltage is present..

Stable power supplies and feedback voltmeter circuit minimize drift and time wasting adjustments. Guard and ground terminals permit measurement of grounded or ungrounded two- or three-terminal resistors. The instruments are supplied in a convenient, portable, Flip-Tilt case that is a stand for the meter in use and protects
it in transit and storage.

Some Megohmmeter Applications

• Testing Insulation Resistance of Wire and Cables
• Testing Insulation Resistance of Ceramic, Mica, Paper and Other Capacitors
• Measuring Reverse Resistance of Rectifiers
• Testing Solid State Diodes

1864-9700 1864 Analog Megohmmeter, Portable
1863-9700 1863 Analog Megohmmeter, Portable

Accessories
Standard
Instruction Manual
Calibration Certificate

Compatible Accessories
1863-0100-00 1863/1864 Extra Manual
1863-11 Resistivity Test Fixture
1864-11 Resistivity Test Fixture
630018 Test lead set (red and black, 4 ft in length, unshielded)

Application Notes

• Connection of the 1864 Megohmmeter to the 1864-11 Resistivity Test Set
• Connection of the 1863 Megohmmeter to the 1863-11 Resistivity Test Set
• Using the 1864 Megohmmeter in Aircraft Fuel Pump Inspection
• Using the 1864 Megohmmeter in the DC-10 Aircraft
• Insulation Resistance of Cables for the 1863/1864 Megohmmeter