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  All Products >> DS720 Universal Type (details)

DS720 Motor Armature Tester (universal type)



Appearance Reference                      Application Case



Applicable to electrical properties test of motor armature with any number of commutator bars, for example, automotive motors, motorcycle starter motors, power tools motors, traction motors, vacuum cleaner motors, fitness equipment motors, motors for kitchens, permanent magnetic micro-motors, special-purpose motors


Functional Features

Measure the welding resistance accurately to the micro-ohm level; the automatic judgment threshold for armature welding resistance can be set to 100 micro-ohms (ie 0.100 milliohms) or even smaller; discover armature rosin joints and nonconforming welds fast and accurately; the screen provides fault location information to facilitate armature troubleshooting

Resistance test between any bars; automatically identify bar to bar short circuit, broken wire, resistance over-limit, and provide fault information

Proprietary bar-to-bar resistance fuzzy sort and identification; automatically identify single-fork, double-fork or large and small bar winding process, and hookup direction; automatically track and test an armature regardless of where it is placed; analyze the number of turns, diameter of enameled wires and slight difference in winding tension by this means

Automatic alarm upon wrong coil CW/CCW hookup direction

Unique automatic range switching and test tracking; therefore a higher accuracy than other similar instruments throughout the measurement range. It is not required to set the instrument measurement range as the armature resistance range is not required to know beforehand; even an ordinary operators can sample an armature with its parameters unknown very easily and formulate the automatic judgment criteria

Automatic, multiple-wave judgment of turn-to-turn surge test between any bars under any form of surge, any times of surge;

HIPOT, turn to turn surge test voltage settable, automatically generated and regulated; test data immune to fluctuations from external grid; offset the inherent leakage current of test system automatically

Automatic ambient temperature compensation and high voltage test leak compensation to ensure test accuracy

Automatically count the number and pass ratio of test samples, make statistics of nonconformities

Automatically/manually analyze, and store the automatic judgment criteria of armatures of different models and specifications

Double-station configuration, high test efficiency

>>> Enter the Product Selection Guide ...


Technical Specifications


Commutator Bars


DC Resistance Test

Range: 0.500mΩ ~ 500.0Ω (automatically switch the range in the FSR; selected based on the order requirements)

FSR Accuracy: ±1.5%, ±0.5% (optional)

Welding Resistance Test

Range: 0.00199.00 mΩ, Resolution: 1 μΩ

Measurement Accuracy: ±10 μΩ (@ bar to bar resistance<1 Ω), ±20 μΩ (@1Ω<bar to bar resistance<10Ω)

Note: NOT for 3-bar armatures

Insulation Resistance Test

Test Voltage: DC 500V auto-regulated (set a voltage up to DC 1000V, auto-regulated)

Measurement Range: 5500 MΩ

Measurement Accuracy: ±5%


Test Voltage: max. 1kV/2kV optional (settable, auto-regulated)

Leakage Current: 0.15 mA, 10 mA, 20 mA optional

Measuring Accuracy: ≤±5%, ±3% optional

Test Time: continuously adjustable from 0 to 60 seconds

Surge Test

Voltage Peak: max. 1kV (voltage peak settable, storage capacitor automatically regulated)

Accuracy: ±5 %; Comparison Method: differential area

Sampling Frequency: 40MHz adaptive

Operating Power Supply

AC220V±10%, 50Hz

Operating Air Pressure



5.7', 240×320 dot matrix

Dielectric Strength

1500V, 50Hz, 1min

Operating Ambient Temperature


Operating RH


Outline Dimensions Reference (mm)

Height: 12601400

Width: 560800

Depth: 580620

Equipment Weight

About 50kg (depending on configuration)


1. “Optional” parameters, functions, number of stations, test fixtures and special specifications herein are subject to order negotiation and the state at delivery.

2. For technical indicators, test functions, system functions, shape & structure, configuration of fixtures & clamps, the ordering requirements shall prevail
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