1863 High Resistance Megohmmeter. Test Voltage up to 500 VDC.
1864 High Resistance Megohmmeter. Test Voltage from 10 VDC to 109 VDC and to 1090 VDC.
The GenRad 1863 1864 High Resistance Megohmmeter is the choice for production and inspection tests.
The 1863 Megohmmeter is the choice for production and inspection tests. The 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.
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)

• Rugged and Portable Analog Megohmmeter

• 3% Basic Accuracy

• Up to 200 Test Voltages from 10 V to 1090 VDC

• 50 kΩ to 200 TΩ Measurement Range

• Maximum of 2 mA Charge Current

• Analog Output

• Large, Direct Reading Front Panel Meter

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.

Resistance Accuracy:

1863:(min reading 0.5)
Range 1-5: ± 2(meter reading +1)%
Range 6: ± 2% to accuracy above
Range 7: ± 4% to accuracy above

1864:(min reading 0.5)
Range 1-5: ± 2(meter reading +1)%
Range 6: ± 2% to accuracy above
Range 7: ± 3% to accuracy above
Range 8: ±5% to accuracy above

Voltage Accuracy:
(across unknown): +/-2%
Short-Circuit Current:
5mA approximately

Input Terminals: Front Panel Mounted:
                          4 Binding Posts
                         (+) unknown (red)
                         (-) unknown (red)
                         guard (red)
                         ground (silver)

Display: Analog meter

Caution High Voltage warning indicator

Dimensions: Flip Tilt Case

(w x h x d) : (9.63 x 10 x 6.75 inches)

(245 x 254 x 172 mm)

Weight: Approx. 4.4 kg (9.5 lbs) - Net

Approx. 7.0 kg (14 lbs) - Shipping

Power: 100 to 125V or 200 to 250V,
50-400Hz, 13W

Environmental: Operating: 0°C to +40°C, stated accuracy <70% RH

Storage: -20°C to +60°C, <80% RH