Impedance, voltage division factor, isolation and series voltage drop of line impedance stabilisation networks, artificial mains networks and impedance stabilisation networks, measured on site under LAB Support Ltd.'s A2LA accredited ISO/IEC 17025 scope.
A conducted emission result is only as good as the network between the product and the receiver. CISPR 16-1-2 specifies the impedance the LISN must present to the equipment under test and the voltage division factor the receiver reading is corrected with. Both drift with age, heat and connector wear. Calibrating them on site means the network is measured with the cables and adapters you actually use, and it never leaves the bench.
| Parameter | Range | Common methods and standards |
|---|---|---|
| Voltage division factor, insertion loss | 9 kHz to 1 GHz | CISPR 16-1-2, ANSI C63.4, network analyser with calibration kit |
| EUT port impedance, magnitude and phase | 9 kHz to 1 GHz | CISPR 16-1-2 impedance tolerance |
| Isolation, mains to EUT port | 9 kHz to 1 GHz | CISPR 16-1-2 |
| Series voltage drop | Up to 300 V | CISPR 16-1-2, DMM and power analyser |
| ISN voltage division factor and isolation, LCL | 9 kHz to 250 MHz | CISPR 16-1-2, CISPR 32 |
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 network within the scope can be calibrated; these are the ones we see most.
Impedance and division factor are measured with the network unpowered, as CISPR 16-1-2 describes. Series voltage drop, which shows whether the internal inductors carry your supply current without saturation, is measured with the mains applied.
Yes. HV-AN networks used for CISPR 25 and ECE R10 DC supply lines, such as the Schwarzbeck NNHV series and Teseq HV-AN family, are within the scope for impedance, division factor and isolation.
Measured impedance magnitude and phase, voltage division factor and isolation per line at the frequencies CISPR 16-1-2 lists, with the tolerance mask, the expanded uncertainty and the traceability statement. Plots are included for each line.
About an hour per two-line network and up to two hours for a three-phase network. A typical laboratory's networks are completed in one visit alongside CDNs, clamps and probes.
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