The M4000, together with Doble Test Assistant® (DTA) expert system, was specially developed as a result of feedback from power system executives that their personnel must be empowered to do quality work, though their numbers and experience levels are tending to decrease. Although you may have expert testers now, the situation could be significantly different only a few short years from now.

Easy to use "smart" instruments, with expert system software to help interpret the results (in effect, raising a "flag" for all test results outside the norm), will make your test program more efficient, reducing the likelihood that expensive extra outages will be required in the future due to testing mistakes and misdiagnoses.

Smart technology results in additional benefits, both subtle and profound. For example, with the M4000 design there is less likelihood that excess test voltage will be accidentally applied to specimens. However, to cite an example with more fundamental consequences, in-service failures (which might be the result of calculation errors and misdiagnoses of test results), also will be less likely to occur when using the "system" approach involving the M4000 in combination with DTA.

Ruggedness, translated into the ability of the instrument to perform consistently despite rough handling and transportation, is another aspect to consider. If the instrument or its associated test leads should fail after the apparatus has been cleared for test, considerable time and effort will have been lost and a second outage may be required. Doble experience in the area of field testing has resulted in the development of rugged and reliable instruments - and test leads!

While in no way intending to minimize the importance of lower voltage apparatus to system reliability, all EHV insulation (at least) should be tested with the Doble M4000. With our new Line Frequency Modulation technique for rejecting interference, many low capacitance EHV specimens (e.g., breaker columns) will be quickly and easily tested without having to disconnect sections of bus and grounding adjacent modules. This alone will save considerable time, effort, and expense, in addition to the fact that the test results will be more accurate and reliable than ever before in locations of unusually severe interference.

In summary, doing more with less means that field-test engineers must work smarter and more efficiently than before. This requires that they be provided with the optimum tools to do the job.

M4000 with Doble Test Assistant® (DTA)

Using Doble's DTA Expert System and the M4000 Automated Insulation Analyzer, efficiency and accuracy of apparatus insulation field tests are improved. External interference is eliminated, measurement is automatic, and results are analyzed according to 3700 rules, and then stored in the relational database for scheduling, inventory, and comparative analysis.

Doble Test Assistant® (DTA) is a comprehensive software system designed to enhance test-crew productivity, improve the accuracy of test data used by maintenance engineers for decision making, and provide computerized apparatus nameplate and test data for inventory control, equipment scheduling, and statistical analysis.

M4000 Features

The M4000 10-kV Portable Automated Insulation Analyzer is the new generation of test equipment for determining the insulation quality of high voltage power apparatus in the field. The new M4000 Insulation Analyzer is now:

• Automated with WindowsTM software for easy operation.
• More accurate and sensitive, for testing apparatus under conditions of high electrostatic and electromagnetic interference, due to shielding features and the new Line Frequency Modulation Measurement Technique.
• Easier to move and position using the M4300 Transport Option.
• Able to test apparatus over greater range (300 mA maximum current; 12-kV maximum test voltage).
• Simple to operate: select the test mode, select the voltage, press the safety switches, rate the test voltage, observe the display, print the report.

Software Features

M4100 Instrument Features

Safety Features

M4100 Technical Specifications

Power Specifications

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Output Voltage		Output Power	3 kVA
Range: Distortion: Output Current	0 to 12 kV 2% total harmonic distortion for linear loads. Compares with normal building 120 V ac outlets 100 mA continuous at 10 kV 300 mA intermitten at 10 kV	Input Power	95-132, 190-264 V ac, autoselectable 47 to 63 Hz with no loss in performance when used with portable generators. 20 A max. at 110 V, 10 A max. at 220 V

Measurement Accuracy and Range

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Test Frequency		Capacitance
Range:	45 to 70 Hz	Range:	0 to 2.7 µF auto ranging
Resolution:	0.1 Hz	Resolution:	0.1 pF
Accuracy:	±1% of reading	Accuracy:	±0.5% of reading, ±1 pF
Test Voltage		Inductance
Range:	25 to 12 kV	Range:	132 H to 1000 kH at 10 kV
Resolution:	1 V	Resolution:	0.001 mH
Accuracy:	±1% of reading, ±1V	Accuracy:	±1.5% of reading
Test Current		Watts
Range:	0 to 5.0000 A auto ranging 0 to 50.0 A when corrected or referred to 10 kV	Range:	0 to 2kW, actual power 0 to 100kW when corrected or referred to 10kV
Resolution:	0.0001mA (0.1 µA)	Resolution:	0.5 mW
Accuracy:	±1% of reading, ±1 µA	Accuracy:	±2% of reading at 10 kV ±0.03% of VA, ±0.5 mW
Power Factor		Temperature Measurement
Range:	0 to ±100.00% PF (±0 to 1.0000)	Range:	-20°C to+50°C
Resolution:	0.01% PF (0.0001)
Accuracy:	±1% of reading ±0.04% PF (0.0004)	Accuracy:	±4°C

Maximum Interference Conditions

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Electrostatic at Line Frequency

15 mA, rms, maximum current into any lead or cable. Specifications applicable (typically) to maximum ratio of interference current to specimen current of 20:1.

Electromagnetic at Line Frequency

500 µT, at 60 Hz, in any direction

Environmental

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Temperature		Electrostatic Discharge	Meets I.E.C. 801-2(1984)
Operating: Storage:	-20°C to +50°C -40°C to +70°C	Surge Withstand Capability	Meets ANSI/IEEE C37.90.1
Humidity	80% to 90%, non-condensing	Shock and Vibration	ASTM D999.75 transport and shock test

Dimensions and Weights

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Instrument:	10-1/4"Hx20"Wx25-1/4D" approx 100lbs.	Accessory Case:	20"x12" x 9" (cablebag 26lbs.; 60'HVcable18lbs.)
Oil Cell:	9"x 8"x 8" approx. 6 lbs.	Manual Bag: Transport:	18"x12"x3" 48-1/2"x20-1/2"x19-1/2" 33-1/2lbs(optional)

M4000 Transport

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The M4000 Transport's rugged construction is specifically designed to ensure smooth easy travel over all field conditions.

The safety and protection of the M4000, Transport and Accessories can be ensured through the Doble designed and NSTA approved Transit Cases. Every component of the Transit Case is specifically designed to individually house and protect each component of the M4000 Insulation Analyzer. The Doble Transit Cases are constructed from the best materials offered for reliability and travel safety.

High-densisty plastic molded shell for durability. Tight seal rubber gaskets to lock out the elements Custom configured shock absorbing foam rubber lining. Alloy metal hinges and recessed twist-lock fasteners.

M4000 test equipment and accessories assembled for field trasportation.

M4000 assembled for test in the field.

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Note: Continuous improvements in Doble's hardware and software products may result in changes to specifications you may see on this page.

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