CISPR-Compliant Detectors—Not Just Marketing: EMC regulations specify that emissions must be measured with specific detector types. Quasi-Peak detection, for example, weights impulsive emissions differently than continuous emissions—a brief spark gap discharge reads lower on a Quasi-Peak detector than a continuous carrier of the same peak amplitude. This is by design: the weighting reflects the actual interference impact on a victim receiver. Without Quasi-Peak detection, you're measuring peak emissions and comparing to Quasi-Peak limits—which means you're over-reporting impulsive emissions and potentially redesigning circuits that would actually pass formal testing. The EMI option provides all four CISPR 16-1-1 detectors: Peak, Quasi-Peak, Average, and RMS-Average.

100+ Built-in Regulatory Limit Lines: Knowing whether an emission is a compliance problem requires overlaying the correct regulatory limit on your measurement. The EMI option includes pre-configured limits for FCC Part 15 (Class A and B, conducted and radiated), CISPR 11, CISPR 22/32, EN 55032, CISPR 25 (automotive), MIL-STD-461, and many more. Select your standard, and the limit line appears on the display with automatic pass/fail margin reporting. No more printing out limit tables and eyeballing the comparison.

Automated Pre-Compliance Scanning: The EMI option provides a structured Scan → Search → Measure workflow. The initial scan sweeps the full frequency range with peak detection to identify all emissions. The search step identifies the worst-case peaks. The final measure step applies the correct CISPR detector (Quasi-Peak or Average) at each identified emission frequency, using standards-compliant dwell times. This automated sequence replaces what would otherwise be 20–30 minutes of manual marker placement and detector switching at each suspect frequency.

The 2 Hz Starting Frequency Advantage: Most spectrum analyzers start at 9 kHz or 10 Hz. The UTS7000A starts at 2 Hz—covering the entire conducted emissions frequency range from below 150 kHz through 30 MHz, plus the radiated emissions range through mmWave frequencies, all on one instrument. For power electronics engineers dealing with switching noise at 10–500 kHz, this means continuous measurement from the switching fundamental through its harmonics into the radiated emissions range, without switching instruments or measurement configurations.

FCC Part 15 (Unintentional Radiators): Consumer electronics, computing devices, and virtually any product with a digital clock must comply with Part 15 emissions limits. Class B (residential) limits are 10 dB more stringent than Class A (commercial). The EMI option includes both Class A and B limits for conducted (150 kHz – 30 MHz) and radiated (30 MHz – 40 GHz) emissions.

CISPR 11 (ISM Equipment): Industrial, scientific, and medical equipment—including power supplies, motor drives, induction heaters, and medical imaging systems. CISPR 11 specifies both conducted and radiated limits with Group 1/2 and Class A/B categorizations.

CISPR 32 / EN 55032 (Multimedia Equipment): The harmonized European standard for emissions from IT and multimedia equipment. Replaced CISPR 22/EN 55022 and expanded coverage to include audio/video equipment.

CISPR 25 (Automotive Components): Component-level emissions requirements for automotive electronics—critical for the rapidly growing market of in-vehicle electronics, ADAS modules, EV power electronics, and infotainment systems.

MIL-STD-461 (Military EMC): Conducted and radiated emissions limits for military equipment. While the UTS7000A's Chinese manufacturing may restrict its use in some defense programs, the limit lines remain valuable for defense contractor pre-compliance work and dual-use commercial products.

100% POI Catches What Swept Analysis Misses: Many EMI emissions are intermittent—clock harmonics that appear only during specific operating modes, switching transients that occur once per power cycle, or burst emissions from communication modules. Traditional swept-mode EMI scanning can miss these entirely because the analyzer isn't tuned to the offending frequency when the emission occurs. The UTS7000A's real-time analysis with 100% POI provides a fundamentally different approach: within the real-time bandwidth window, every emission lasting more than a few microseconds is guaranteed to be captured. Use RTSA mode to identify suspect frequency ranges, then switch to the EMI option's formal measurement workflow for standards-compliant Quasi-Peak characterization.

Preamplifier Recommended for Radiated Testing: For radiated emissions measurements, signal levels at the analyzer input can be quite low after accounting for antenna factors, cable losses, and measurement distance correction. The optional preamplifier (P13/P26/P32/P40—factory-installed, must be ordered with the analyzer) improves sensitivity by 12–17 dB, providing comfortable measurement margin above the noise floor. This is particularly important for radiated emissions above 1 GHz where path losses and cable attenuation increase significantly.