Transfer impedance, coupling and decoupling factor, insertion loss and probe attenuation measured on site under LAB Support Ltd.'s A2LA accredited ISO/IEC 17025 scope, by the LAB Support Southeast Asia team, with the certificate issued in your laboratory.
A current probe's transfer impedance turns a receiver reading into amperes. An injection probe or EM clamp's coupling factor sets the level of a bulk current injection or IEC 61000-4-6 test. If either has drifted, the whole test is offset. These devices are ferrite-based and sensitive to mechanical damage, so laboratories that move them between benches see the most drift. The measurement uses the calibration fixture the standard describes and a network analyser, which the team brings to your bench.
| Parameter | Range | Common methods and standards |
|---|---|---|
| Current probe transfer impedance and admittance | 9 kHz to 1 GHz | CISPR 16-1-2, calibration fixture, network analyser |
| Injection probe insertion loss in fixture | 9 kHz to 1 GHz | ISO 11452-4, MIL-STD-461 CS114, IEC 61000-4-6 |
| EM clamp impedance, coupling and decoupling factor | 9 kHz to 1 GHz | IEC 61000-4-6, network analyser |
| Decoupling clamp impedance and decoupling factor | 9 kHz to 1 GHz | IEC 61000-4-6 |
| Capacitive coupling clamp, EFT pulse at the clamp | 0.1 kV to 5 kV | IEC 61000-4-4 with the generator, oscilloscope |
| Voltage probes, attenuation and bandwidth | DC to 500 MHz | Oscilloscope and network analyser |
The methods and standards shown are the ones most commonly requested. Within each parameter and range listed on the accredited scope, other calibration methods and standard editions can be supported under the flexible-scope provisions of LAB Support's A2LA accreditation. The measurement uncertainty for each parameter is stated on the certificate. Field calibration is included in the scope for every line above.
From our own calibration records. Any probe or clamp within the scope can be calibrated; these are the ones we see most.
If you have the manufacturer's fixture we use it, because the standard defines the result in that fixture. For the common Teseq, Fischer and Schwarzbeck probes the team carries its own fixtures.
Yes. Injection probes and their fixtures for ISO 11452-4 and MIL-STD-461 CS114 are measured for insertion loss in the fixture, which is what the test procedures use to set the forward power.
Most laboratories use 12 to 24 months. Clamps with damaged ferrites, cracked housings or replaced connectors should be recalibrated immediately, since the coupling factor changes with the ferrite path.
With the generator, as IEC 61000-4-4 describes: the burst waveform is verified at the clamp with a transducer plate and oscilloscope. The generator itself is calibrated at the same visit if required.
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