Laplace Instruments Kits: Emissions Kit

These kits provide a means of measuring radiated emissions (and optionally conducted emissions too) in a most cost effective manner. They can provide both pre-compliance checks and compliance measurements as required for the self-test, self-certification strategy.

Emissions may be either radiated or conducted or both.

If radiated measurements are required, the choice is related to the test environment or site. Either an OATS (Open Area Test Site) can be used, or a test cell/chamber. 
These kits can be configured for the combination of tests that your product requires. The type of product determines the EMC standard to be applied, and to a lesser extent, the parameters of the test.

For example, products whose main purpose is illumination, ie, lighting, should comply with EN55015. This standard is quite explicit. There are three tests required:

-         conducted emissions (LISN method)
-         magnetic field (Large Loop Antenna method)
-         radiated emissions (CDN method)

The core of the required system will be the SA1002-A EMC analyser, plus an RF915 pre-selector. To understand what a pre-selector is and does, click here.

Then for conducted emissions, the LISN-A-16A1P is required.

For radiated emissions, add the S46M3 CDN.

And for magnetic field, the RF300 is required.

See ALECS systems for more details of test systems for luminaires.

For most other types of products, a ‘core' system based on either the SA1002 or SA3000 EMC analyser is required. The former scans up to 1GHz, the latter up to 3GHz. The choice will be specified by the standard. This core system will cover both conducted and radiated emission tests.

Then for conducted emissions, add a  suitable LISN, and, ideally, a pre-selector too.  Kit reference is RFC-....

A common component used to ensure compliance to the conducted emission limits is the mains filter. Laplace has introduced a powerful analysis system (the FAS system) which enables a filter to be designed to exactly match the requirements as a time saving alternative to the usual trial and error technique, and which ensures that the resultant solution is not over engineered and unecessarily expensive.

For radiated emissions the first consideration is the choice of test site. Officially, the preferred type of site is the OATS (Open Area Test Site). Ideally this is a large, flat open area with no metallic surfaces within several meters of the product/antenna combination. Also, it should have a perfectly flat metallic ground plane and the antenna should be on a mast so that it can be ‘scanned' over a height of between 1 and 4 meters off the ground.

Non of our customers are likely to have such a facility. So we have developed techniques that eliminate much of the above for OATS testing. You might test in a car park, or indoors, eg... loading bay, conference room, corner of production area, etc.... These sites suffer from 2 main problems... ambient (background) noise, and test site calibration.

Our analysers and associated software include features that overcome both of these problems. See ‘ambient cancellation and test site calibration for technical explanations of our solutions.

So for an OATS type of test, add RF200 antenna, SA1020 pre-amp, RF700 filter and ERS reference source. If scanning above 1GHz, add RF230 too.
The kit reference is RFG-... (1GHz) or RF3G-.... (3GHz). These kits can cover conducted measurements too.

If the product is relatively small (max size 19" x 13u rack, or 60 x 60 x 60cm) then a test cell offers several advantages.......

-         Fully screened, so totally quiet inside.. no ambient noise.
-         fully calibrated.
-         Convenient.... Will sit in a corner of your lab and is always ready when you are.
-         Can be used for radiated RF immunity testing too.

The disadvantage of using a cell is that it is not as accurate as an OATS, so a greater margin of uncertainty must be applied.  

If a cell looks like the best option, we have 2 sizes, Lc300/2 for products up to 30cm cube, and Lc600 for products up to 60cm cube. These are simply connected direct to the analyser. No other items are required. Kit reference is RFL-....

Other test cells could be used in conjunction with the analyser, provided that they have been calibrated and correlated against a 3m OATS.

Anechoic chambers are a final option. These can be treated as an OATS, but without any ambient or background noise. So for this situation, an EMC analyser plus RF200, SA1020 and ERS are required.  For scanning above 1GHz, the RF230 is required.

In summary: 

If testing Luminaires to EN55015, ... use ALECS 

For the simplest systems to measure emissions... use RFC- or RFG-

For systems based on a test cell (LaplaCell)... use RFL-

For systems to test both emissions and immunity... use CLIENTS

For a system to design mains filters....use FAS

      CLIENTS - Fully integrated emissions and immunity test system
      RFG kit - Complete systems for radiated and/or conducted emissions
      RFC- conducted emissions kit - Complete integrated system for conducted emissions measurements
      RFL kit - An integrated radiated emissions test system with test cell.
      ALECS - ALECS (Automated Luminaire Emissions Compliance System) is a complete solution for the requirements of EN55015
      Filter Design System - Integrated system for solving conducted emission problems