Guangzhou ETCR Electronic Technology Co., Ltd.
China Electrical Instrumentation Verification Service (CEIVS)
Add: No.8 Yongxing He Xingdong Street, Taihe Town, Baiyun District, Guangzhou, China
Tel: +86-020-62199556 Fax: +86-020-62199550
Website: https://CEIVS-verification.pages.dev
REPORT OF PRODUCTS CALIBRATION VERIFICATION
✓ APPROVED & CERTIFIED
COMPLIANT WITH STANDARDS
REG-AUTHENTIC
IEC 61557-5 / ISO 17025
Product Name:
Clamp Earth Resistance Tester
Model/Type:
ETCR 2100A+
Serial No.:
CERT-2024-8849
Applicable Standard:
IEC 61557-5:2019 / IEEE 81 / ISO/IEC 17025:2017
Calibration Purpose:
Grounding loop resistance & fault loop impedance verification
Conclusion:
PASS / APPROVED
Verified by (Stamp):
| CERTIFICATION TEAM | |
|---|---|
| Approved by | LAN SEN YANG |
| Inspected by | JIN HU PAN |
| Verified by | WEI GAO LU |
OFFICIAL STAMP
★ APPROVED ★
APPROVED • ADMITTED
CEIVS / CERTIFIED
Authorized Calibration Laboratory
CEIVS ONLINE VERIFICATION
China Electrical Instrumentation Verification Service
Scan QR code with any mobile device to verify certificate authenticity, metrological traceability and compliance with international standards (IEC 61557 / ISO/IEC 17025).
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Verification Date: 27' July, 2026
Suggested Validity: 12 Months | Valid Until: 27' July, 2027
Calibration Report: Clamp Earth Resistance (Loop Impedance Method)
ISO/IEC 17025 TRACEABLE • IEC 61557-5
1. Environmental conditions during verification:
(Temperature) 22±3 °C (RH) 50~60 % (Barometric Pressure) 101.3 kPa
2. Reference normative documents:
• IEC 61557-5:2019: Equipment for testing, measuring or monitoring protective measures - Part 5: Resistance to earth.
• IEEE Std 81 / IEC 60364-6: Guide for Measuring Earth Resistivity, Ground Impedance, and Safety Verification.
• JJG1054-2009: Verification Regulation of Clamp Earth Resistance Meters.
3. Measurement standards used in calibration (Metrological Traceability):
| Standard device / Model specification | Certificate / Pattern No. | Traceability laboratory | Accuracy class | Valid until |
|---|---|---|---|---|
| Standard Grounding Calibration Loop / JDB-2 | GIM-ER-88412 | Guangdong Institute of Metrology (GIM) | Grade 0.05 (U<0.20%) | 2027/12/27 |
4. Verification test items & safety inspection:
4.1 Jaw alignment & magnetic closure: PASS (P)
4.4 50Hz Industrial noise rejection (>40dB): PASS (P)
4.2 Jaw eccentric position effect: PASS (P)
4.5 Withstand voltage (Jaws to case 3700V): PASS (P)
4.3 Measurement repeatability (s < 0.5%): PASS (P)
4.6 AC Leakage Current test (1mA, 10mA, 1A): PASS (P)
Table 1: Earth Loop Resistance Calibration & Expanded Uncertainty (k=2, 95% Confidence)
| Nominal Pattern (Ω) | Instrument Reading (Ω) | Absolute Error | Expanded Uncertainty (U) | Normative Limit (IEC 61557-5) | Conclusion |
|---|---|---|---|---|---|
| 0.50 Ω | 0.51 Ω | +0.01 Ω | ± 0.008 Ω (k=2) | Operating Error ≤ ±30% | PASS |
| 1.00 Ω | 1.02 Ω | +0.02 Ω | ± 0.015 Ω (k=2) | Operating Error ≤ ±30% | PASS |
| 5.00 Ω | 4.98 Ω | -0.02 Ω | ± 0.035 Ω (k=2) | Operating Error ≤ ±30% | PASS |
| 10.00 Ω | 10.05 Ω | +0.05 Ω | ± 0.080 Ω (k=2) | Operating Error ≤ ±30% | PASS |
| 20.00 Ω | 19.92 Ω | -0.08 Ω | ± 0.120 Ω (k=2) | Standard Threshold (≤20.0 Ω) | PASS |
| 50.00 Ω | 50.30 Ω | +0.30 Ω | ± 0.350 Ω (k=2) | Operating Error ≤ ±30% | PASS |
| 100.0 Ω | 99.40 Ω | -0.60 Ω | ± 0.850 Ω (k=2) | Operating Error ≤ ±30% | PASS |
*Note: Calibrated via induction loop standard with closed jaws. Operating uncertainty and error well within IEC 61557-5 limits.
Max Relative Error: < ±0.70% (PASS)
5. Conclusion for the verification:
PASS (合格) — Full Compliance with IEC 61557-5 & ISO/IEC 17025 Standards
CEIVS METROLOGY VERIFICATION SYSTEM • ACCREDITED TO ISO/IEC 17025
| CERTIFICATION TEAM | |
|---|---|
| Approved by | LAN SEN YANG |
| Inspected by | JIN HU PAN |
| Verified by | WEI GAO LU |
OFFICIAL STAMP
★ APPROVED ★
APPROVED • ADMITTED
CEIVS / CERTIFIED
Calibration Report: Insulation Resistance Tester (Megohmmeter)
ISO/IEC 17025 TRACEABLE • IEC 61557-2
1. Environmental conditions during verification:
(Temperature) 22±3 °C (RH) 50~55 % (Barometric Pressure) 101.2 kPa
2. Reference normative documents:
• IEC 61557-2:2019: Equipment for testing, measuring or monitoring protective measures - Part 2: Insulation resistance.
• IEC 60364-6 / IEEE 43: Low-voltage Electrical Installations - Verification / Practice for Insulation Testing.
• JJG622-1997 / JJG1005-2019: Verification Regulation of Electronic Insulation Resistance Meters.
3. Measurement standards used in calibration (Metrological Traceability):
| Standard device / Model specification | Certificate / Pattern No. | Traceability laboratory | Accuracy class | Valid until |
|---|---|---|---|---|
| High Voltage Decade Resistance Box (0.1MΩ~5GΩ) / ZX118D | GIM-HV-98241 | Guangdong Institute of Metrology (GIM) | Grade 0.05 (U<0.25%) | 2027/12/27 |
4. High Voltage Injection & Short-Circuit Current Test (IEC 61557-2):
Test Voltage 250 VDC (Open / Rated Load 1mA): 258 V / 252 V (PASS)
Short-circuit current (Isc ≥ 1mA, < 3.5mA): 1.45 mA (PASS)
Test Voltage 500 VDC (Open / Rated Load 1mA): 512 V / 504 V (PASS)
Rated test current (IN at nominal UN): 1.20 mA ≥ 1.0 mA (PASS)
Test Voltage 1000 VDC (Open / Rated Load 1mA): 1025 V / 1008 V (PASS)
Discharge time of residual voltage (< 2s): 0.65 s (PASS)
Table 1: Insulation Resistance Calibration & Expanded Uncertainty (k=2, 95% Confidence)
| Nominal Pattern (MΩ) | Instrument Reading (MΩ) | Absolute Error | Expanded Uncertainty (U) | Normative Limit (IEC 61557-2) | Conclusion |
|---|---|---|---|---|---|
| 1.000 MΩ | 1.010 MΩ | +0.010 MΩ | ± 0.008 MΩ (k=2) | Operating Error ≤ ±30% | PASS |
| 10.00 MΩ | 9.98 MΩ | -0.02 MΩ | ± 0.060 MΩ (k=2) | Operating Error ≤ ±30% | PASS |
| 50.00 MΩ | 50.30 MΩ | +0.30 MΩ | ± 0.350 MΩ (k=2) | Operating Error ≤ ±30% | PASS |
| 100.0 MΩ | 101.4 MΩ | +1.40 MΩ | ± 0.800 MΩ (k=2) | Operating Error ≤ ±30% | PASS |
| 500.0 MΩ | 496.2 MΩ | -3.80 MΩ | ± 4.200 MΩ (k=2) | Operating Error ≤ ±30% | PASS |
| 1000 MΩ (1 GΩ) | 1015 MΩ | +15.0 MΩ | ± 12.00 MΩ (k=2) | Operating Error ≤ ±30% | PASS |
*Note: Operating error within ±30% at operating limits in accordance with IEC 61557-2 requirements.
Max Relative Error: < ±0.70% (PASS)
5. Conclusion for the verification:
PASS (合格) — Full Compliance with IEC 61557-2 & ISO/IEC 17025 Standards
CEIVS METROLOGY VERIFICATION SYSTEM • ACCREDITED TO ISO/IEC 17025
| CERTIFICATION TEAM | |
|---|---|
| Approved by | LAN SEN YANG |
| Inspected by | JIN HU PAN |
| Verified by | WEI GAO LU |
OFFICIAL STAMP
★ APPROVED ★
APPROVED • ADMITTED
CEIVS / CERTIFIED