High Voltage
Cable Tester

The 4250 is a self-contained high voltage cable tester optimized for testing cables quickly and easily. The intuitive software interface and flexible hardware system make testing cables quick and easy.

4250 High Voltage Cable Tester

The Cirris 4250 cable tester combines the powerful Cirris OS software with the intuitive Cirris Adapter System to create a capable tester that can accurately analyze your cables for opens, shorts, miswires, and other errors.​

It’s small footprint brings testing to your benchtop​ and is capable of testing wires with resistors, capacitors and diodes​. With a 7″ color capacitive touch screen​ and wired or wireless ethernet, the 4250 makes testing easy and accessible.

The 4250 comes standard with 128 test points and can expand to 1024 test points​ in 128-point increments with expansion units.


high voltage test on 4250

High Voltage

Perform high voltage dielectric withstand (DW) and insulation resistance (IR) testing up to 1500 VDC (2000 VDC and 1000 VAC optional).

4250 wireframe

Compact & Expandable

Expansion boxes create up to 1024 test points (128 points per box). Small, lightweight, and self-contained for easy movement around production floor.

zener diodes

Essential Testing

Test for opens, shorts, miswires, and intermittent errors including components such as resistors, diodes, and capacitors. Efficient algorithms reduce time spent on testing.

attaching a Cirris adapter to the tester

Cirris Adapter System

Add test points with expansion boxes in 128 point increments. Test up to a maximum of 1024 test points per station.

high voltage warning


High voltage current and voltage are limited to add operator safety and protect the tested device.

Test technicians using laptop at wiring harness

Network capable

Wired and wireless ethernet. Integrates with the Cirris Hub software to share test programs and network printers among multiple units.


Test Points

Base Unit 128 points; expandable to 1,024 points in 128-point increments.

Low Voltage Test

2 Wire

  • Voltage: 4 VDC max
  • Current: 3 μA to 6 mA
  • Resistance: 0.1 Ω to 100 kΩ ± 1% ± 0.1 Ω, 100 kΩ to 5 MΩ ± 10%

4 Wire

  • Voltage: 4 VDC max
  • Current: 1 mA to 1 A
  • Resistance: 0.001 Ω to 10 Ω ± 2% ± 0.001 Ω

Component Tests

  • Diodes: Silicon, LEDs, zeners with breakdown > 4 V
  • Resistors:0.1 Ω to 100 kΩ ± 1% ± 0.1 Ω, 100 kΩ to 5 MΩ ± 10%
  • Capacitors: 5 nF to 100 μF ±10% ± 0.02 nF
  • Twisted Pairs: Verify proper pairing in twisted pair cables

High Voltage Test

Insulation Resistance Test
  • Voltage: 100 to 1500 VDC ± 5% (2000 VDC optional), 50 to 100 VDC ± 5V
  • Resistance: 5 MΩ to 1000 MΩ ± 10%
Dielectric Withstand Test
  • Voltage:  50 to 1500 VDC (2000VDC, 50 to 1000 VAC optional), < 100V ± 5% ± 5V, ≥ 100 ± 5%, 10ms to 120s or 1 to 7200 cycles
  • Current Limit: 0.1 mA to 1.5 mA
  • Max Capacitance Per Net: 150 nF @ 300 VDC, 90 nF @ 500 VDC, 45 nF @ 1000 VDC, 30 nF @ 1500 VDC, 9.5 nF @ 1000 VAC
  • HV Energy Limit: 35 mJ
  • HV Charge Limit: 45 μC

Max Points Per Net


Digital Input/Output

4 Inputs* / 6 Outputs, 24 V max, open collector outputs
* 2 inputs are available only via scripting or Easy-Wire Software

Test Point Interface

Cirris Adapter System

User Interface

  • Display: 7” color graphical display with capacitive touch screen (800 X 480 pixel resolution)
  • Interface Languages: English, German, Spanish, and French.
  • Memory: Internal memory for test program storage (8GB or more)
  • File transfer: Transfer test programs either by connecting directly to a PC or using a USB flash drive.
  • Printing: Local label printing via serial port. Network printing via optional Cirris Hub™ software.
  • Optional PC control: Additional advanced features via Easy-Wire® software


100-240V~, 50-60Hz, 1.2A

Dimensions (width x height x depth)

  • Main Unit: 17.4 x 5.2 x 6.7 in. (44.1 x 13.2 x 17.0 cm)
  • Add-on Box: 6.3 x 5.2 x 6.7 in. (16.0 cm x 13.2 cm x 17.0 cm)

Note: Dimensions are approximate.  Contact factory for exact product dimensions.


  • Main Unit: 11.35 lb (5.15 kg)
  • Add-on Box: 5.00 lb (2.27 kg)



4250 Datasheet

Version 2023.4.1  |  375.72 KB

Product Options

4250 High Voltage Cable Tester

4250 Base Unit

Base Unit Voltage and Test Points
  • 1500 VDC Base Unit with 128 points (C4250-1500)
  • 1500 VDC Base Unit with 64 points (C4250-1564)
  • 2000 VDC Base Unit with 128 points (C4250-2000)
  • 2000 VDC Base Unit with 64 points (C4250-2064)
4250 expansion unit

4250 Expansion Unit

Increase the test point count in your system by adding up to seven expansion boxes for a maximum of 1024 test points. Seven add-ons can be mounted in one or two rows. An internal cable (CBL-1024) must be used when using seven expansion boxes.

  • 1500 VDC 128 points (4250-E15)
  • 2000 VDC 128 points (4250-E20)

4250 AC Option (AC1K-4250)

Adds AC high voltage capability up to 1000 VAC.

4250 Scripting Option (SCPT-4250)

Scripting can make your tester more flexible to customize a test process for a unique task. Examples for using scripts:

  • Create complex tests that are easy for line workers to use.
  • Provide extra control external devices such as lamps, hold-down clamps, markers, etc.
  • Add flexibility when testing devices such as switches, gas fuses, zener diodes, bi-color diodes, etc.
  • Interact with sensors to verify color and lighting of LEDs.
  • Display operator prompts and messages.
  • Hipot different nets at different voltages.

4250 PC Control  (PCC-4250)

Control the 4250 using a Windows PC running Easy-Wire software. Easy-Wire license required.


Easy-Wire Software (SOFT-EW)

Provides added capability to control the 4250 tester. 4250 PC Control required.

Cirris Server Software (LANL-EW)

Use Easy-Wire software to share test information on a network.

4250 Data Collection (SPC-4250)

Allows the 4200 to save test data which can then be imported into a spreadsheet or third party SPC data processing program. You can use the data to analyze and improve product quality or to generate reports for either your customers or in-house management team. Data collection must also be enabled to show measured values on reports when using Easy-Wire software.

4250 Performance Verification Kit (PCHK-4250)

Allows you to verify the calibration and proper functionality of the 4250 tester.

Digital IO Module

Digital IO Expansion Module (DIO-MOD)

The 4250 Tester comes standard with four inputs and six outputs. The Digital IO Expansion Module increases IO capability with 20 pins that can be configured to either inputs or outputs, and eight output-only pins. Use Digital I/O to add automation devices, such as start buttons, clamping mechanisms, status lights and audio output.

Product Documentation & Software

Getting Started

4200 Series Getting Started Guide

Get your tester set up and run your first test.


4200 Series Getting Started Guide

Version 2023.4.1  |  734.36 KB


4200 Series User Manual

Learn all about your tester.


4200 Series User Manual

Version 2024.2.0  |  2.30 MB


4200 Series with Easy-Wire Getting Started Guide

Getting your tester up and running when controlling it with the optional Easy-Wire software.

Supporting Documentation & Software

4200 Migration Guide

If you want to use test programs from the Cirris 1100, Touch1, or Easy-Touch testers, read this document.


4200 Series Migration Guide

Version 2020.3.0  |  539.99 KB


Cirris Hub

Allows the user to see tester status, share test programs, edit tests, and print to network printers. The Cirris Hub interface can be accessed on a network PC or mobile device.


Cirris Hub Install

Version 2023.4.1.8024  |  256.01 MB
MD5 Checksum: 6c047a1f97fcbf1f7a038d5330ef3330   ...


Cirris Hub User Manual

Version 2023.2.0  |  4.16 MB


42XX Utilities

This executable installs both the 42XX Security Utility that allows you to restrict menu access on the tester, and the 42XX Download Utility to update the tester firmware.


4200 Series Utilities Install

Version 2021.3.1_8001  |  26.42 MB


SPC Link

If you are not using Easy-Wire to control your 42XX tester, and you have Data Collection enabled on your tester, this software allows export of collected test data to a spreadsheet program. Refer to the 4200 Series User Manual for more information.


SPC Link

Version 2019.3.1.7  |  105.91 MB


Easy-Wire Software

Optional software that expands the 42XX tester features by allowing it to be controlled with the Easy-Wire Software on a connected PC. Easy-Wire software allows more options for test control, test archiving, and test reporting. If networking, the Cirris Server Software must be the same version as the Easy-Wire Station Software.


Easy-Wire Station

Version 2023.4.4.8025  |  337.46 MB
MD5 Checksum: 04f51953c8a804f8524ff7af3082b457 Cirris...


Cirris Server

Allows testers running Easy-Wire to be networked together storing test programs and test data in a central network location. Software version must be the same version as your Easy-Wire install. Contact your Cirris salesperson to purchase and receive unlock password.


Cirris Server Install

Version 2023.4.4.8025  |  306.82 MB
MD5 Checksum: 09199eae1021bd544c1e9bc7a12d8c6e ...


Cirris Server Installation Guide

Version 2023.4.2  |  197.94 KB


Digital IO Module

Digital IO allows you to set up automated actions to make the test process safer and more efficient.


Digital I/O Module Getting Started Guide

Version 2017.12.05  |  170.52 KB


4250 Performance Verification

Use this procedure with a Performance Verification kit to verify the calibration of your tester.


4250 Performance Verification Manual

Version 2021.2.0  |  797.37 KB

Additional Documentation & Software

Stand-Alone Scripting 4200 Testers

Scripting allows test customization of the test process and reports. Scripting is an optional feature that must be purchased. Stand-Alone scripting allows the scripting on the tester without the tester being controlled by Easy-Wire software.


LUA Scripting Manual

Version 2010.0.0  |  962.77 KB


Easy-Wire Scripting

Scripting allows customization of the test process and reports. Scripting is an optional feature. Use Easy-Wire scripting when the tester is being controlled by Easy-Wire.


Easy-Wire Scripting Manual

Version 2017.4.0  |  1.80 MB


Cirris Tester Access API (CTA)

Allows the tester, when controlled by Easy-Wire Software, to be controlled by a third party application such as LabVIEW, C++, C#, Python, and Delphi.


Cirris Tester Access (CTA) User Manual

Version 2023.2.0  |  536.15 KB


Cirris Tester Access (CTA) User Manual

Version 2023.2.0  |  536.15 KB


Cirris Test Language

Use commands to control the tester through serial or USB.


Cirris Test Language

Version 2021.4.0  |  539.06 KB