Doble M4000 Power Factor/Tan-Delta Instrument

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Doble M4000
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Specifications Brochure Supplemental Document
The Doble M4000 Power Factor/Tan-Delta Instrument is the leading system for evaluating the condition of high voltage power apparatus. The Doble M4000 is for field and factory acceptance, preventive-maintenance, and emergency diagnostic testing of all types of electrical power apparatus insulation to detect changes, and possible failure hazards, prevents loss of service by permitting orderly repair or reconditioning of defective insulation. It sets the standard for accuracy, reliable test results, and intelligent diagnostics for customers worldwide.
Doble M4000 Features
  • Totally eliminates substation signal interference with Doble's patented Line Frequency Modulation technology
  • Generates its own clean test signal for the most reliable and repeatable results
  • The highest power to better replicate in service condition
  • Self-calibrating in the field, so it's always accurate
  • Advanced digital technology takes accuracy to new levels
  • Automated setup eliminates errors
  • Automated setup eliminates errors
  • All records are presented in a format that is easy to read, save and print.
  • DTA Web provides an on-line database of test results, complete with powerful analysis tools.


Diagnostic Capabilities:
  • Power Factor Testing to confirm insulation integrity and quality
  • Capacitance Testing to measure physical changes that may have occurred to the apparatus
  • Turns Ratio Testing to detect shorted turns or winding damage
  • Leakage Reactance/Short Circuit Impedance Testing to evaluate winding deformation
  • Single Phase Excitation Current Testing to evaluate the transformer magnetizing circuit
  • Capacitor bank testing using the M4110, and the M4140 detects deteriorating or failed capacitors within a bank.
  • 45-70Hz output selectable
  • Maximum Test Current: 300mA at 10kV
  • Maximum Test Voltage: 12kV
  • Measures Power Factor for all impedances (capacitive, resistive, and inductive)