General Radio 1863

General Radio 1863

The General Radio 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 1864 Megommeter 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
1864 can be set to any common, or uncommon test votage 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 permits measurements up to 200TΩ (2 x 1014Ω)
Both instruments 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
ungroundeded 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.

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