China Electrical Instrumentation Verification Service (CEIVS)
中国电气仪器仪表检测与核验中心
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
检验合格 • 证书有效
REG-AUTHENTIC
IEC 61557-5 / ISO 17025
Product Name:
Clamp Earth Resistance Tester
Model/Type:
2100A+
Serial No.:
22611161
Applicable Standard:
IEC 61557-5:2019 / IEEE 81 / ISO/IEC 17025:2017
Calibration Purpose:
Grounding loop resistance & fault loop impedance verification
Conclusion:
PASS / 检验合格
Verified by (Stamp)
| CERTIFICATION TEAM | |
|---|---|
| Approved by | LAN SEN YANG |
| Inspected by | JIN HU PAN |
| Verified by | WEI GAO LU |
OFFICIAL STAMP
★ APPROVED ★
检验合格 • 准予准入
CEIVS / CERTIFIED
Authorized Calibration Laboratory
CEIVS ONLINE VERIFICATION
中国电气仪器仪表检测与核验中心
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: 23' January, 2024
Suggested Validity: 12 Months | Valid Until: 22' January, 2025
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 ★
检验合格 • 准予准入
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 ★
检验合格 • 准予准入
CEIVS / CERTIFIED