Sr. Customer Application Support

Role Overview:

We are seeking a highly skilled Application Engineer with strong expertise in energy metering technologies, including developing metrology (single & three phase) , DLMS/COSEM protocol, and energy meter hardware architecture.

Education

Bachelor’s degree in electrical engineering, Electronics, Instrumentation, or related fields. Master’s degree is a plus.

Key Skill set:

Strong Understanding of Electrical Measurement Principles:

• Fundamentals of AC power measurement (single‑phase & three‑phase)
• RMS calculations for voltage, current, power & energy
• Concepts of active, reactive, apparent power
• Power factor measurement (displacement & distortion PF)
• CT/PT interfacing, burden selection, linearity, and phase‑angle correction
• Anti‑tamper metering concepts (neutral disturbance, magnetic tamper, bypass detection)

Expertise in Metrology Algorithms

• Implementation of sampling, digital filtering, and signal conditioning
• Frequency tracking & phase‑locked loop (PLL) algorithms
• Compensation techniques for:
  • Gain & offset errors
  • Phase angle errors
  • Temperature drift
• Energy calculation algorithms (block processing, time‑division sampling, etc.)
• Low‑signal detection, creep handling, and start‑up threshold logic

ADC & Sensor Interface Knowledge

• Experience with Σ‑Δ (Sigma‑Delta) ADCs, multi‑channel high‑resolution converters
• Understanding sampling rate, aliasing, ENOB, quantization noise
• Design and calibration of current sensors:
  • Shunts
  • CTs
  • Rogowski coils
  • Hall sensors
• Noise isolation, grounding, and analog front‑end design

DLMS/COSEM Knowledge (for Smart Meters)

While metrology is separate from DLMS, a metrology engineer should understand how measured parameters map to communication standards:

• OBIS code mapping for power & energy registers
• COSEM interface objects related to billing, load profiles, events
• Security suites (Suite 0 / Suite 1 / Suite 2)
• Interoperability testing with HES/MDM
• DLMS data structures for profile capture & metering blocks

Calibration & Accuracy Testing

• Hands‑on experience with meter test benches (ZERA, Radian, Secure, L&T)
• Multi‑point calibration techniques:
  • Voltage, current, phase angle, power factor
• Accuracy standards:
  • IS 16444 (Smart Meters)
  • IS 15959 (DLMS)
  • IEC 62053‑21/22/23
• Endurance, creep, tamper, harmonic, and influence quantity testing

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