Cable/Harness Tester
Cable/Harness Tester

In the cable soldering process, open circuit, short circuit, and non-wetting (both cold soldering and empty solder) are the most common processing defects and the most common problems found in cable quality control.

The Microtest 8740 cable/harness and connector testers has 8740N, 8740NA (8740NAC), 8740FA four different models, and provide 128, 256 and 512 pins. These four models are different for AC/DC high-voltage measurement value. The 8740NAC is specially designed for the measurement of TYPE-C, and can also be used with current expansion box for providing the enhanced current carrying capacity of Type-C charging cables therefore ensuring quality of charging current passing through the cable.

The measurement items of 8740 cable/harness tester have (1) Open/Short;(2) Conductance; (3) Components; (4) AC Hipot; (5) DC insulation/ Hipot; (6) Quick conductance (7) Intermittence O/S, and (8) Quick Intermittence open circuit.

It provides a completed RS232 communication to transfer the test results back to the PC terminal for storage as well. The built-in memory space can store more than 200 groups of the test files. It supports RS232, USB and the Printer interfaces.

  • 128 / 256 / 512 testing points
  • Number of test file up to 500 sets
  • Multiple DUT testing - 4 pieces(standard)/14 pieces(option)
  • Identify the defective step of sequencial multiple DUT test
  • Automatically identify the normal or reverse plugin of connectors
  • Capacitor polarity and diode leakage current test
  • DC Hipot insulation test rapidly
  • AC/DC Hipot leakage current test rapidly
  • With single ended cable Open/Short test and HV Insulation/Leakage Current Test
  • With Open/Short/Conductance/Components test
  • Extendable testing ranges of Open/Short: 2k ~ 100kΩ
  • Advanced technology high speed of “Intermittence Open/ Short and Conductance Test”
  • USB (Software update, test results storage, files up/down)
  • With Speaker/Earphone jack
  • LCD contrast/Sound Volume (adjustable)
  • External current expand box for wire buck measurement

Measurement Data

Model 8740N 8740NA 8740FA
AC Hipot   - 100 ~ 700V  100-1000V 
DC Hipot  50 ~ 1000V  50 ~ 1000V 50-1500V 
AC Hipot Leakage Current 0.01mA ~5mA  
DC Hipot Leakage Current 0.1µA ~ 1000µA
DC Hipot Insulation 1MΩ ~ 1GΩ
Hipot Output Accuracy ±5%
Hipot Measurement Accuracy ±5%    
Rated Output 5Vdc    
Low Voltage Resistance 0.1Ω ~ 2MΩ    
Ponit of Test  128/256/512 Points 128/256/512 Points 128/256 Points
Basic Measurement Time 0.01 Second
Test Scan Mode

Auto, Manual, External Trigger

Measurement Signal Low Voltage Measurement Signal
DUT Requirement Maximum Electric Capacity Allowance 1μF
Panel System / Rapid / Edit / Function 
Indicator Pass/Fail HV LED red-green indicator lights/Screen Display/Sound


Power Supply Fixed Voltage 115 / 230 Vac ±10% 
  Frequency 60 / 50 Hz
Display 320*240 dot-matrix display
Interface Printer Port, RS-232, USB
Flash Memory

Store up to 500 Sets of Test Settings Files

Operation Manual、 Auto、 Remote Control
Environment Temperature :15 ~ 35  Humidity : RH75%
Dimension (W*H*D) 8740(128) - 435x145x406 mm
8740(256) - 435x145x406 mm
8740(512) - 435x190x406 mm
Weight  8740(128) - 8.44 kg
8740(256) - 9.3 kg
8740(512) - 14 kg

Parameters Measurement Ranges

Item Range
Open/Short  2KΩ ~ 100KΩ
Intermittence Open/ Short 2KΩ ~ 100KΩ 
Open/Short determinal Judge Judge Momentary Broken Circuit
Conductance Max.50.0Ω
Resistance Max.10MΩ
Capacitance  10pF ~ 1µF  
Diode 0 - 7V   
IR  1MΩ ~ 1GΩ  
Single-Side Test Able to do the Single-Side Test
AC Hipot Leakage Current  0.01mA ~5mA
DC Hipot Leakage Current  0.1µA ~ 1000µA

Advanced Functions 

Programmable continuous test
Pin search


All kinds of wires, connectors



8740  Cable tester 線材測試儀器
operating instruction 操作說明



8740NAC(type-c)  Cable tester 線材測試儀器
operating instruction 操作說明


For YOUKU Link:

1. 益和 MICROTEST 8740  线材测试仪器  操作说明

1. 益和 MICROTEST 8740NAC Type-c  线材测试仪器  操作说明


Standard Accessories

  • Power Cord
  • Test Report
  • User Manual CD
  • Fixture Flat Cable(AK-8600F2)

Optional Accessories

  • Remote Control Cable
  • Footswitch
  • Calibration Kits(KB-8730K1)
  • RS-232 Cable
  • USB-C Fixture