1865+ CE Digital Megohmmeter I/R Tester

1865+ CE  Digital Megohmmeter I/R Tester

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Photo represents example of series. See datasheet for more details on any specific model.

  • Measurements from 1kΩ to 100TΩ, with Auto Ranging
  • 0.5% measurement accuracy
  • Improved High-visibility blue LCD graphical display for Menu Programming and Test Results
  • Programmable Test Voltage from 1 to 1000VDC
  • Fully Programmable Measure Cycle Times
  • Automatic Test Lead Zeroing To Eliminate Connection Errors
  • Direct Reading of Measured Resistance or Current
Priced at $6,575

Estimated Delivery is 3 to 5 weeks

Repair/Calibration Quote Technical Support Request
The 1865 + is the Megohmmeter for todays most challenging applications
Unit comes with optional CE marking which is a mandatory conformance mark for products being used in Europe


The 1865 + Megohmmeter/IR tester, with digital display, is used for high accuracy measurements of insulation resistance on a wide variety of components, materials and electronic devices. Resistance values greater than 100 teraohms can be measured with a basic accuracy of 0.5% at DC voltages up to 1000V.

A programmable limit makes the megohmmeter ideal for pass/fail testing in a production environment and is also adaptable for use in automated system applications with its included RS-232 Interface or optional IEEE-488 interface.

Precision Measurements: The IET Labs 1865 + Megohmmeter provides resistance measurement capability from 1kΩ to 100TΩ (test voltage dependent) with a basic accuracy of 0.5%. To meet test requirements for a wide range of devices, the test voltage is fully programmable up to 1000V DC. Sensing the proper resistance measurement range is done automatically, thus eliminating setup errors; and in order to eliminate lead or fixture errors, the operator can easily initiate an automatic zeroing routine of test leads.

Easy to use: The 1865+'s menu programming system is significantly improved, simple controls and indicators combine for efficiency of test and productivity. Its multi-function keypad provides the operator with an easy way to program and make measurements.

Pass/Fail Testing: Measured results are automatically compared to an operator programmed limit for pass/fail testing. Pass/Fail indicator lights or a pass/fail output from the megohmmeter I/O interface provide a clear indication of the measured results.

Program and Data Storage: Test setup conditions and measured results of the megohmmeter can be stored in CSV format for easy use with Microsoft Excel. Storage options include:

  • *512 MB of internal instrument memory,
  • *A computer (via the IEEE interface)
  • *A flash drive (via the USB port)
  • *New programs can also be uploaded via the IEEE interface or the USB port.


Automated Testing: For automated system applications, the 1865+ Megohmmeter includes an I/O interface connection with remote start and pass/fail outputs. An optional IEEE-488 interface is also available (or can be added later), which enables the 1865 to be remotely controlled by a computer.

Resistance or Current Display Mode: Besides a readout of insulation resistance in ohms, the operator can select a display mode for reading the measured current directly .

Safety Features: The 1865 + Megohmmeter provides safety features such as current limiting, a warning indicator when high voltage is active, and safety interlock, all for protection of the operator.

Component Test Fixture: An accessory fixture is available for use with the 1865+ Megohmmeter which accommodates a variety of component types, including radial, axial and chip components. Its shielded case reduces electrical noise and interference and includes a cover interlock switch and remote start for maximum operator safety.

Why Buy?

  • *For precision high resistance measurements over a wide voltage range
  • *For automated testing requiring remote start and pass/fail output
  • *To data log test results via RS-232, Flash Drive or IEEE-488 interface

Product Package

The following accessories come standard with the megohmmeter:

  • 150073 1865 Instruction Manual
  • 4200-0300 AC Power Cable
  • 800014/15 Capacitor Adapters (100kΩ & 1MΩ)
  • 520049 Power Line Fuse (2.5A, 250V)
  • 630019 Interlock Connector
  • Calibration Certificate Traceable to NIST

1865+ Megohmmeter Basic Specifications (Full specifications can be found on datasheet)

Resistance range: 1 kΩ (103 Ω) to >100 TΩ (1014 Ω)

No of ranges: 7 manually settable plus auto-ranging

Voltage range: 1 to 1,000 volts, programmable in two ranges

Voltage accuracy at front panel connectors:
1 - 100 V: 1% of setting + 1% Resolution: 25 mV
100 - 1,000 V: 1% of setting + 2 % Resolution: 250 mV

Resistance accuracy: ±[0.45% +{(RX/VX)(0.0005FS + 2pA) + 30Ω/RX}100%]:
RX = Measured resistance in ohms
VX = Programmed voltage in volts
FS = Full scale current range in amperes

Measuring current: 0.1 pA (10-13 A) to 1 mA (10-3 A)

Current accuracy at front panel connectors:
1 nA to 1 mA ±[0.5% + (0.0005 FS + 2 pA)]
100 pA to 1 nA ±[1% + (0.0005 FS + 2 pA)]
1 pA to 100 pA ±[10% + (0.0005 FS + 2 pA)]

Short-circuit current:<2 mA

Input impedance: 5 kΩ, ±5%

Output voltage impedance: 1 kΩ, ±5%

Measurement limits: Pass/Fail (1 limit)

Interfaces: Standard: RS-232, I/O port with safety interlock Optional: IEEE-488 & Data/Program storage via USB port

Input terminals: Four sheathed banana jacks, front-mounted (with optional rear-mounting) + unknown (red) - unknown (black) guard (blue) ground (green)

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