Megger DLRO600S Resistance Meter Repair - Power Plant, Raichur
Fault Analysis
The Problem
Systematic +4.2% resistance measurement error across 0.1-600 Ω range
Capacitive charging reference circuit drift in analog conditioning module
Thin-film reference resistors (R47, R48, R49) out-of-tolerance due to thermal aging
LT1167 precision amplifier IC output stage drift contributing 2.3% error
Expired calibration certificate (8 months overdue), readings non-compliant with IEEE Std 51-2002
Money Saved
Cost Savings Breakdown
What this customer saved by repairing instead of buying new
* Govt. taxes extra as applicable · Shipping charges extra as applicable on the repair quote.
This Repair's Journey
From Inquiry to Delivery
Completed in 73 hours
Inquiry Received
Equipment details logged, initial assessment scheduled
Diagnosis & Evaluation
Component-level fault analysis with detailed report
Repair Work
Expert component-level repair using OEM-grade parts
Testing & QC
Full-load testing under operating conditions, QA sign-off
Delivery & Warranty
Dispatched with test report and 6-month warranty
Inquiry Received
Equipment details logged, initial assessment scheduled
Diagnosis & Evaluation
Component-level fault analysis with detailed report
Repair Work
Expert component-level repair using OEM-grade parts
Testing & QC
Full-load testing under operating conditions, QA sign-off
Delivery & Warranty
Dispatched with test report and 6-month warranty
Technical Details
Our Repair Approach
Bench Characterization and Diagnostics
Performed full-range resistance measurement sweep using calibrated Fluke 5080A decade box to quantify drift magnitude across 0.001-600 Ω operating range and confirm 4.2% systematic error.
Analog Module PCB Inspection and Root Cause Analysis
Identified precision thin-film resistors (R47, R48, R49) exhibiting thermal drift and LT1167 amplifier IC leakage at output stage using precision multimeter and ESR/capacitance analyzer on isolated test board.
Component-Level Replacement and Re-soldering
Replaced three thin-film reference resistors with 0.05% tolerance Vishay metal-film units, re-soldered LT1167 IC using selective wave-soldering with RoHS flux, and installed fresh Kemet polymer capacitor (C156) for calibration memory backup.
21-Point Recalibration and Thermal Validation
Executed comprehensive calibration curve using Fluke 5080A across full measurement range, conducted thermal cycling stress testing (-10 to +55°C, 4 cycles), and verified accuracy restoration to +0.08% specification.
Final Verification and Certification
Confirmed measurement accuracy across transformer winding resistance band (2-8 Ω) at ±0.08% tolerance, issued fresh 24-month calibration certificate compliant with IEEE Std 51-2002 and ISO/IEC 17025.
Mission Accomplished
The Result
The Megger DLRO600S was returned to Raichur within 73 hours of intake, permitting the power plant to complete all three transformer winding resistance tests on schedule and confirm transformer integrity. The repair saved the utility ₹95,000 in new equipment procurement costs versus OEM replacement pricing (₹130,000 vs ₹35,000 repair charge), while eliminating the risk of a 200 MW generation capacity loss and associated grid penalty fees estimated at ₹8-12 lakhs per hour of downtime.
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