DDX 9121b

Additional Product Information

Features & Benefits


  • User defined measuring band.
  • Modular design, 1 to 9 detectors- easily upgradable.
  • Embedded switch with four PD inputs per detector.
  • Simultaneous RIV and PD reading.
  • PD patterns like Φ-q-n (phase, magnitude, occurrence)
  • High resolution spectrum analyzer with oscilloscope.
  • Data acquisition and test report generation.
  • AC and DC measuring modes
  • PD Site Location (SL) on cables


  • Reduces ground noise – The built in frequency spectrum analysis and selectable frequency band let the user optimize the setup in seconds.
  • Optimizes investment if needs change. Unit can be easily upgraded (RIV, 4 inputs switch, simultaneous PD readings, PD on DC, etc.)
  • Reduces training time – The Windows based software makes the use of the device easier than ever. Operators can start using the device in minutes.
  • Straightforward replacement – replacement is as simple as removing the obsolete PD detector and measuring quadruple and installing the DDX 9121b.
  • PD interpretation The phase resolved analysis and recording capabilities allow for future data analysis.
  • Easy to integrate into test systems Its compact design standard BNC measuring cables and remote control capabilities make it ideal for an integrated PD test system together with an AC power supply.
  • Power and Distribution Transformers
  • Instrument Transformers
  • Rotating Machines
  • Power Capacitors
  • Cables
  • Switchgears
  • Surge Arrestors
  • Research & Development
  • IEC-60060 Parts 1 and 2
  • ICEA T-24-380
  • IEC-60270
  • ASTM D1868-93
  • IEC-885-2 and 885-3
  • ANSI C57.113
  • IEEE Std. 4, 1995
  • ANSI C57.124-91
  • ANSI C63.2-1996
  • NEMA 107
  • KAL 9510 – Basic Partial Discharge Calibrator
  • KAL 9520 – Advanced Partial Discharge Calibrator
  • KAL 9530: RIV calibrator
  • AKV 9310: Passive universal coupling impedances series
  • AKV 9330: Coupling impedance optimized for power capacitors PD measurement
  • 9230: Coupling capacitors series
  • 9230/20/1-PD: Coupling capacitor 20 kV for Partial Discharge measurement