GenRad 1864 Megohmmeter

• 200 Test Voltagesfrom 10 V to 1090 VDC
• Rugged and Portable Analog Megohmmeter
• Up to 3% Accuracy
• 50 kΩto 200 TΩ MeasurementRange
• ReliableHighQuality Instrument Designed to Last up to 30 years
• SuggestedEquipment in Boeing ServiceBulletinsfor DC-10, 747 and others
• SelfContained, Portable Carrying Case
• Large, Direct Reading Front Panel Meter
• Maximum of 5 mA ChargeCurrent
• Analog Output

TheGenRad 1864 Megohmmeteristhechoicefor more demandingapplications. The test voltagecanbe set to anyvaluefrom 10VDC to 109VDC in 1-voltsteps and to 1090VDC in 10 volt steps. ThustheGenRad 1864 canbe set to anycommon, oruncommon test voltageforceramic, micaorpapercapacitors, orotherdevices. The reverse resistanceofrectifierscanbereadilymeasured; thelow test voltages are especiallyuseful in measuring solid statediodes. Anadditionalrange on the 1864 Megohmmeterpermitsmeasurements up to 200 TΩ (2 x 1014Ω)

Stability ofcalibration in theGenRad 1864 Megohmmeterismaintainedby useof a four-transistor unity gainamplifier. In addition, no warm-up drift isencountered, and highzero stability ismaintainedduringoperation.  Humanengineering has not beenoverlooked in theGenRad 1864 Megohmmeter as evidenced by thewarninglightthatisactivated by theapplicationofthe test voltage. The 1864 employees a Measure/Charge/Dischargeswitch and provisionfor performance grounded and ungroundedmeasurements.

TheGenRad 1864 Megohmmeteriseasy to use with direct-reading meter indication and lightedrangeswitchthatshowsthemultiplierforeachrange and voltage. The maximum currentpossibleattheterminalsis limited to a 5mA and a panel lightneartheterminalswarnswhenvoltageispresent.

Stablepowersupplies and feedback voltmetercircuitminimize drift and timewastingadjustments. Guard and groundterminalspermitmeasurementofgroundedorungroundedtwo- orthree-terminalresistors. Theinstruments are supplied in a convenient, portable, Flip-Tilt case thatis a standforthe meter in use and protectsit in transit and storage

SomeGenRad 1864 MegohmmeterApplications

• TestingInsulationResistanceofWire and Cables
• TestingInsulationResistanceofCeramic, Mica, Paper and OtherCapacitors
• Measuring Reverse ResistanceofRectifiers
• Testing Solid StateDiodes