GENERAL

5 Test voltages from 50, 100, 200, 250, 500 Vdc
Rugged and portable analog megohmmeter
Up to 3% accuracy
50 kΩ to 20 TΩ measurement range
Maximum of 5 mA charge current
Analog output

Suggested equipment in aircraft service bulletins for DC-10, 747 and others
Self contained, portable carrying case
Large, direct reading front panel meter
Reliable high quality instrument designed to last up to 30 years

DESCRIPTION

The GenRad/IET 1863 Megohmmeter is the choice for production and inspection tests on devices with resistances up to 20 Tohms. The GenRad/IET 1863 will measure resistance at any of five test voltages of: 50 V, 100 V, 200 V, 250 V, and 500 Vdc. Compared to the GenRad/IET 1864, which has adjustable test voltages from 10 V to 1090 V, this unit has fewer controls, and is the more economical of the two models.

Stability of calibration in the GenRad 1863 Megohmmeter is maintained by use of a four-transistor unity gain amplifier. Stable power supplies and feedback voltmeter circuit minimize drift and time wasting adjustments.

Safety has not been overlooked in the GenRad 1863 Megohmmeter as evidenced by the warning light that is activated by the application of the test voltage. The maximum current possible at the terminals is limited to a 5mA. The Megohmmeter employs a Measure/Charge/Discharge switch for quick charging and discharging of capacitive devices such as long lengths of cable and capacitors.

The GenRad 1863 Megohmmeter is easy to use with direct-reading meter indication and lighted range switch that shows the multiplier for each range and voltage.

Guard and ground terminals permit measurement of grounded or guarded devices. The guard is particularly helpful in measuring three terminal resistors. The ground terminal is used on applications such as insulation resistance of cables in a water bath, where the water needs to be grounded for safety, or other devices where one of the measurement terminals is connected to earth ground.

The 1863 Megohmmeter is supplied in a robust and convenient, portable, Flip-Tilt case that is a stand for the meter in use and protects it in transit and storage.

Some GenRad/IET 1863 Megohmmeter Applications

Testing insulation resistance of wire and cables
Testing insulation resistance of capacitors, sensors, heating elements
Insulation resistance of harnesses and connectors
Testing thermal switches, relays and other electrical components

Fuse Selection Guide for 1863/1864

SPECIFICATION

GenRad 1863 Basic Specifications:

(Full specifications can be found on the datasheet)

Resistance Accuracy: (min reading 0.5) Range 1-5: ± 2(meter reading +1)%
Range 6: ± 2% to accuracy above, Range 7: ± 4% to accuracy above
Voltage Accuracy: (across unknown): +/-2%
Short-Circuit Current: 5mA approximately
Voltage and Resistance Ranges

Voltage	Rmin (Full Scale)	Rmax	Useful Ranges
50VDC ,100VDC	50 kΩ	2 TΩ	7
200, 250, & 500 VDC	500 kΩ	20 TΩ	7

DATASHEET AND MANUAL

Data Sheet: This document explains the features, options, Specifications and option models for this item.
Product Manual: Specifications and option models for this item. This document contains the technical product manual and guidelines.

APPLICATION NOTES AND SOFTWARE

Application Notes: Application notes and technical resources for this instrument.

ACCESSORIES

1863-11 RESISTIVITY TEST FIXTURE FOR 1863, 1864	630018 LEADSET FOR 1863 & 1864 MEGOHMMETER	630018/S SHIELDED LEADSET FOR MEGOHMMETERS
ISO-17025 ACCREDITED CALIBRATION WITH TEST DATA	NIST TRACEABLE CALIBRATION CERT (INCLUDED)	TLK-100 DELUXE SET OF TESTING LEADS (17 PCS)