Insights > RF + Microwave

FieldFox Now Supports EMI Pre-Compliance Measurements

2021-11-30  |  5 min read 

Base stations and mobile devices generate most unwanted signals that cause noise and interference, however other RF devices can also disturb the spectrum. Electromagnetic interference (EMI) is interference caused by electromagnetic fields generated from an electronic device or electrical current. EMI can be man-made, like from electrical circuits, or can occur naturally, like lightning.

Lightning striking above a road

Many countries enforce strict EMI compliance standards, and their regulatory bodies demand formal EMI compliance tests. To save on the cost of formal testing and accelerate time-to-market, companies that develop electrical devices and systems must measure the EMI emissions of their designed devices before sending them to formal compliance testing. EMI performance verification and diagnostics are common tests for the lab, the manufacturing floor, field equipment, and regulatory inspections.

Before compliance measurements can be performed on a product, some preliminary questions must be answered: 

  1. Where will the product be sold? For example, the United States, Europe, or Japan?
  2. What is the classification of the product? For example, information technology equipment (ITE), industrial, scientific, or medical (ISM), or automotive and communications.
  3. Where will the product be used? For example, home, commercial, light industry, or heavy industry.

With the answers to the questions above, you can determine which testing requirements apply to your product by referring to Tables 1 and 2 below. For example, if you have determined that your product is an ITE device that will be sold in the U.S., then you need to test the product to FCC Part 15 regulations.

Table 1. Comparison of international regulatory agency requirements
CISPR FCC Emissions Standard Description
11 Part 18 EN 55011 Industrial, scientific, and medical
13 Part 15 EN 55013 Broadcast receivers
14   EN 55014 Household appliances/tools
15   EN 55015 Fluorescent lights/luminaries
16-1-1     Measurement apparatus/methods
22 Part 15 EN 55022 Information technology equipment
25   EN 55025 Automotive
    EN 55081-1,2 Generic emissions standards
Table 2. Major European requirements
Equipment Type Emissions Standard
Generic equipment EN 50081-1
Generic equipment  
Light industrial  
Industrial EN 50081-2
Industrial, scientific, medical products (ISM) EN 50011
Sound and broadcast receivers EN 50013
Household appliances EN 50014
Information technology equipment (ITE) EN 50022
Automotive EN 50025


EMI Testing Now Available on FieldFox

A new software option is available for EMI pre-compliance testing using Keysight FieldFox handheld analyzers. Option 361 supports EMI scanning on FieldFox B-models, shown in Figure 1. Spectrum analyzer option 233 is required to enable option 361. Option 361 includes:

  • CISPR pre-set (or pre-defined) band support
  • 6-dB CISPR resolution bandwidth (RBW) support – 200 Hz, 9kHz, 120kHz and 1MHz
  • ISPR detectors – Peak, Quasi-Peak, and EMI average
  • Log frequency sweep
  • User-definable limit line
  • CISPR full band and zoom scan
  • Fast SA scan
  • Amplitude probability distribution (APD)
  • Complementary cumulative distribution function (CCDF)
  • Histogram display
Figure 1. EMI measurements on FieldFox
Figure 1. EMI measurements on FieldFox

Keysight’s FieldFox handheld analyzer provides a comprehensive solution to measure EMI, APD, FFT spectrum analysis, and real-time spectrum analysis (with option 350) with density and spectrogram displays. It is an ideal, handheld solution to address all EMI troubleshooting issues in the field.
Already own a FieldFox? No problem — if you own a B-model with option 233 enabled, you can upgrade your unit to include option 361, simply by enabling the software license. Try it free here.

Find out more about FieldFox’s EMI test capabilities in this solutions brief.