SAC-SINGLAS Accredited · ISO/IEC 17025
Portable Appliance Tester (PAT) Calibration in Singapore
Unitest calibrates portable appliance testers (PAT testers) in Singapore across ground bond 30 mΩ to 1.7 kΩ, insulation 10 kΩ to 999.9 GΩ and leakage current 0.1 mA to 30 mA, under SAC-SINGLAS accreditation LA-2023-0845-C (ISO/IEC 17025). Standard turnaround is 5–7 working days; express service is 2–3 days, with free collection and delivery in Singapore for orders above $300.
Also known as: PAT Tester · Appliance Tester
Why calibrate?
Unitest calibrates portable appliance testers (PAT testers) in Singapore — verifying earth continuity resistance, insulation resistance and leakage current — with traceable ISO/IEC 17025 certificates. PAT testing results are only defensible if the PAT tester itself is calibrated by an accredited lab.
What you receive
What portable appliance tester (PAT) calibration at Unitest covers
Traceable certificate
Calibration certificate with an unbroken traceability chain to national and international standards, recording the as-found condition before any adjustment.
Stated uncertainty
Results reported with measurement uncertainty, so you know exactly how much confidence each reading carries in your quality system.
5–7 day turnaround
Standard turnaround 5–7 working days; express 2–3 working days on request. Free collection and delivery within Singapore for orders above S$300.
Part of our electrical calibration service, accredited under SAC-SINGLAS LA-2023-0845-C.
How often
How often should a portable appliance tester (PAT) be calibrated?
PAT testers should be calibrated every 12 months. Workplace safety requirements and SS CP 38 typically require that electrical safety test equipment carries a valid calibration certificate.
Accredited ranges
Portable Appliance Tester (PAT) calibration ranges & measurement uncertainty
The parameters, ranges and calibration & measurement capability (CMC) below are taken from our SAC-SINGLAS Schedule of Accreditation (LA-2023-0845-C, to ISO/IEC 17025). CMC is the smallest measurement uncertainty we can achieve under accredited conditions.
Ground Bond Resistance measuring instruments (fixed points)· UNI-E004 Rev:0
| Range / measured quantity | Measurement uncertainty (CMC) |
|---|---|
| 30 mΩ | 1.3 mΩ |
| 55 mΩ | 2.1 mΩ |
| 97 mΩ | 2.3 mΩ |
| 350 mΩ | 4.1 mΩ |
| 490 mΩ | 4.4 mΩ |
| 900 mΩ | 9.2 mΩ |
| 1.7 Ω | 0.1 Ω |
| 4.7 Ω | 0.1 Ω |
| 9 Ω | 0.1 Ω |
| 17 Ω | 0.1 Ω |
| 47 Ω | 0.4 Ω |
| 90 Ω | 0.6 Ω |
| 170 Ω | 1.2 Ω |
| 470 Ω | 3.0 Ω |
| 900 Ω | 5.9 Ω |
| 1.7 kΩ | 0.08 kΩ |
High Resistance (Insulation resistance) – measuring instruments· UNI-E004 Rev:0
| Range / measured quantity | Measurement uncertainty (CMC) |
|---|---|
| 10 kΩ – 19.999 kΩ | 0.025 kΩ |
| 20 kΩ – 39.99 kΩ | 0.047 kΩ |
| 40 kΩ – 99.99 kΩ | 0.12 kΩ |
| 100 kΩ – 199.99 kΩ | 0.25 kΩ |
| 200 kΩ – 999.9 kΩ | 0.47 kΩ |
| 1 MΩ – 1.999 MΩ | 0.0081 MΩ |
| 2 MΩ – 9.999 MΩ | 0.01 MΩ |
| 10 MΩ – 19.999 MΩ | 0.092 MΩ |
| 20 MΩ – 199.99 MΩ | 0.60 MΩ |
| 200 MΩ – 999.9 MΩ | 1.4 MΩ |
| 1 GΩ – 1.9 GΩ | 0.074 GΩ |
| 2 GΩ – 10 GΩ | 0.077 GΩ |
| 100 GΩ | 0.15 GΩ |
Leakage Current measuring instruments· UNI-E004 Rev:0
| Range / measured quantity | Measurement uncertainty (CMC) |
|---|---|
| 0.1 mA – 30 mA | 1.7 % |
You can also verify our accreditation on the SAC-SINGLAS directory.
Questions
Portable Appliance Tester (PAT) calibration FAQ
How often should a portable appliance tester (PAT) be calibrated?
PAT testers should be calibrated every 12 months. Workplace safety requirements and SS CP 38 typically require that electrical safety test equipment carries a valid calibration certificate.
Is portable appliance tester (PAT) calibration accredited?
Yes. Portable Appliance Tester (PAT) calibration is covered under our SAC-SINGLAS scope of accreditation (LA-2023-0845-C, ISO/IEC 17025), covering ground bond 30 mΩ to 1.7 kΩ, insulation 10 kΩ to 999.9 GΩ and leakage current 0.1 mA to 30 mA. Certificates state the measured values and measurement uncertainty, traceable to national and international standards. Where an instrument falls outside the accredited ranges, we can calibrate it as a traceable service instead.
How long does portable appliance tester (PAT) calibration take?
Standard turnaround is 5 to 7 working days; express service is 2 to 3 working days. Collection and delivery in Singapore are free for orders above $300.
Can you calibrate my brand of portable appliance tester (PAT)?
Almost certainly — the makes listed on this site are simply the ones customers most commonly send in. Send us the make and model and our engineers will confirm whether it falls within our accredited scope or can be calibrated as a traceable service.
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