Accredited calibration · Test sites and chambers

Test site and chamber validation: NSA, SVSWR, ALSE and shielding

Normalised site attenuation, normalised site insertion loss, site VSWR, ALSE performance validation and shielding effectiveness measured under LAB Support Ltd.'s A2LA accredited ISO/IEC 17025 scope, always on your site, by the LAB Support Southeast Asia team.

Book a site validation Full accredited scope
Why it matters

A chamber is a measuring instrument, and it needs a certificate too

CISPR 16-1-4 and ANSI C63.4 require a semi-anechoic chamber or OATS to demonstrate normalised site attenuation within 4 dB from 30 MHz to 1 GHz and site VSWR within 6 dB above 1 GHz before emission measurements are valid there. CISPR 25 adds the ALSE performance validation for automotive chambers, and shielded rooms are qualified by shielding effectiveness. Assessors ask for these records at every surveillance.

  • NSA by the CISPR 16-1-4 and ANSI C63.4 methods, 30 MHz to 1 GHz, horizontal and vertical
  • Site VSWR 1 GHz to 18 GHz by the CISPR 16-1-4 method
  • NSIL for magnetic-field sites, 9 kHz to 30 MHz
  • ALSE performance validation to CISPR 25 Annex I, 150 kHz to 1 GHz
  • Shielding effectiveness to 18 GHz
ParameterRangeCommon methods and standards
Normalised site attenuation (NSA)30 MHz to 1 GHzCISPR 16-1-4, ANSI C63.4, VCCI V-3, network analyser with calibration kit
Site VSWR (SVSWR)1 GHz to 18 GHzCISPR 16-1-4
Normalised site insertion loss (NSIL)9 kHz to 30 MHzCISPR 16-1-4 Annex, loop antennas
ALSE performance validation150 kHz to 1 GHzCISPR 25 Annex I, network analyser or spectrum analyser
Shielding effectiveness9 kHz to 18 GHzEN 50147-1, IEEE 299, MIL-STD-285

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.

Instruments we calibrate

Models we calibrate most often

From our own calibration records. Any instrument within the scope can be calibrated; these are the ones we see most.

Frankonia SAC-3, SAC-5, SAC-10 chambers TDK semi-anechoic chambers MVG, ETS-Lindgren, Albatross chambers Open-area test sites Shielded rooms and enclosures Fully anechoic rooms to IEC 61000-4-22 and others
On site

How the visit runs

Send the site detailsChamber size, test distance, frequency range and the standards you are assessed against.
We come to youThe team brings calibrated reference antennas, a network analyser, masts, positioners and field probes.
Measure on siteNSA at the positions and polarisations of the standard, SVSWR at the six positions, ALSE reference measurements and shielding sweeps as required.
Certificate on siteISO/IEC 17025 certificate and validation report with the results against the limit lines, uncertainty and traceability.
Frequently asked

Questions we are asked

How long does a 3 m chamber validation take?

Typically two days for NSA and SVSWR together, plus half a day for ALSE performance if the chamber is used for CISPR 25.

How is site VSWR measured?

By the CISPR 16-1-4 method: a transmit antenna at the six positions and both polarisations, with the receive antenna at the test distance, from 1 GHz to 18 GHz. The report shows the SVSWR at each position against the 6 dB limit.

Can field uniformity for IEC 61000-4-3 be done in the same visit?

Yes. Field uniformity verification of the 16-point grid to IEC 61000-4-3 is offered as a verification service, outside the accredited scope, and can be done in the same visit so the chamber is checked for emission and immunity together.

Which countries do you cover?

Malaysia, Singapore and Vietnam, with Penang as the base. Other locations on request.

Tell us what you need to test

We reply within one working day with a quote or a plan.

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