When a Robot Arm Appears in an EMC Test Setup
At the Rohde & Schwarz booth at the EMC exhibition in Cologne this January, the thing that stopped me was not the instruments.
It was the yellow robot arm.
Mounted on a miniature semi-anechoic test table — blue absorber-lined walls, a circular turntable, a log-periodic antenna on a precision positioning mast — a compact industrial robot arm sat at the edge of the setup, ready to move the antenna automatically through its measurement positions.
Above the setup: COMPLIANCE TESTING UP TO 44 GHZ.
The robot arm is not a novelty addition to a standard demo. It is the logical conclusion of a chain of decisions that starts at 44 GHz and ends with the realization that at those frequencies, manual antenna positioning is no longer adequate for repeatable compliance measurement.
R&S compliance testing up to 44 GHz · ESW EMI receivers, automated robot arm · miniature semi-anechoic test setup , Cologne, January 2026. photo: Thomas on X | @SignalByThomas
The R&S ESW: An EMI Receiver That Goes to 44 GHz
The two stacked instruments on the left of the demo are Rohde & Schwarz ESW EMI Test Receivers, covering 11 Hz to 44 GHz. The ESW is not a spectrum analyzer repurposed for EMI work — it is a purpose-built EMI receiver with the detector implementations, calibration traceability, and CISPR 16-1-1 compliance that certified test labs require.
Two units running simultaneously is not redundancy. In a compliance measurement system covering a frequency range as wide as 11 Hz to 44 GHz, it is a practical architecture: one unit handles the lower frequency bands while the other handles upper bands, allowing parallel measurement and dramatically reducing total test time for a full-range compliance scan.
The front panel displays visible in the photo confirm the configuration: the upper unit showing 1.45 GHz and the lower unit at 1.0 GHz — two points in a simultaneous two-channel measurement of adjacent frequency segments.
photo: Thomas on X | @SignalByThomas
ESW-B1000: 510 MHz FFT Bandwidth for CISPR Band C and D
The right-hand display at the booth was showing the product card for the R&S® ESW-B1000 Wideband Extension, with four specific claims:
→ Up to 510 MHz FFT bandwidth for highest testing speeds
→ CISPR band C and D (30 MHz to 1 GHz) measured in one segment
→ Best reliability to detect all emissions
→ High probability of intercept with longer measurement times
The 510 MHz FFT bandwidth figure will be familiar from the Gauss Instruments coverage in Articles 020–022: it is the real-time capture bandwidth that allows simultaneous measurement of a 510 MHz frequency window without swept scanning. In the context of the ESW-B1000, this means CISPR Band C (30–300 MHz) and Band D (300 MHz – 1 GHz) — the primary radiated emissions range for most consumer and industrial products — can be measured in a single segment rather than requiring multiple swept passes.
The compliance implication is direct: a full CISPR Band C+D measurement that might require 10–30 minutes with a conventional swept EMI receiver scan can be completed in a fraction of that time with the ESW-B1000. In a commercial test lab charging by the hour, this is not a convenience. It is a fundamental change in the economics of compliance testing throughput.
The HF1444G14: A High-Gain Antenna Built for 44 GHz Compliance
The background screen in image2 was displaying the R&S® HF1444G14 High-Gain EMI Microwave Antenna, described as "the new Rohde & Schwarz antenna for EMI measurements up to 44 GHz" with three specifications: Low VSWR · Linear polarization · Compact size, positioned as "perfect choice for full compliance testing up to 44 GHz in combination with the R&S® ESW EMI test receiver."
The antenna for a 44 GHz compliance system is not a minor accessory. At 44 GHz — wavelength approximately 6.8 mm — antenna design constraints become severe: gain, pattern stability, impedance match, and physical size relative to the measurement distance all interact in ways that are much more forgiving at 1 GHz. A dedicated high-gain microwave antenna designed specifically for compliance measurement at these frequencies, with calibrated gain data across the full range, is the prerequisite for measurement results that can be compared against CISPR limit lines with confidence.
The broadband omnidirectional antenna visible on the small white tripod on the desk is a complementary measurement tool — likely used for near-field or conducted path measurements where a directional antenna would not be appropriate.
Rohde Schwarz automated EMC compliance test setup with yellow robot arm antenna positioning log periodic antenna turntable semi anechoic chamber and ESW K59 click rate analyzer at Cologne EMV exhibition 2026，photo: Thomas on X | @SignalByThomas
The Robot Arm: Why Automation at 44 GHz Is Not Optional
The yellow robot arm at the edge of the turntable is the detail that makes this demo's argument complete.
In a standard radiated emissions test, the antenna is mounted on a mast that moves to a defined set of heights (typically 1–4 m in a full semi-anechoic chamber, compressed in a table-top setup), and the DUT rotates on the turntable through 360°. For each antenna height and each polarization, the frequency scan runs. The result matrix is: N antenna heights × 2 polarizations × full frequency range × 360° rotation.
At frequencies up to 1 GHz, antenna positioning can be managed with a motorized mast and a simple height controller. At frequencies approaching 44 GHz, the measurement geometry requirements tighten: smaller wavelengths mean smaller antenna movements change the path geometry significantly, and the antenna's near-field region extends further relative to the physical setup dimensions. Precise, repeatable antenna positioning becomes critical to measurement reproducibility.
A robotic arm can position the antenna with sub-millimeter repeatability, at any orientation, without the mechanical backlash or positional uncertainty of a simple motorized mast. It can execute complex measurement trajectories — not just up-and-down height scans, but curved paths that optimize the measurement geometry for different frequency ranges. And it can do so without an operator present, running autonomously through a full measurement matrix while the test lab handles other work.
The miniature semi-anechoic setup in this demo is a scaled representation of a real compliance test cell. The same robotic automation architecture scales directly to a full-size chamber: a 6-axis industrial robot arm on a floor mount, moving a measurement antenna through a precisely programmed trajectory around the DUT, controlled by the same software that drives the ESW receiver and the turntable rotation.
ESW-K59: Click Rate Analysis for CISPR 14-1
The third product shown at this booth — visible on the right screen in image3 — is the R&S® ESW-K59 Click Rate Analyzer, described as a software option for "CISPR 14-1 compliant discontinuous disturbance measurements."
Click rate analysis is a specific test category within CISPR 14-1 (electromagnetic disturbances from household appliances) that addresses intermittent or switching emissions — the "clicks" produced by thermostats, motor switches, relay operations, and similar control elements. These emissions are not continuous and therefore cannot be characterized by the peak or quasi-peak detectors used for continuous disturbance measurements. CISPR 14-1 defines a specific click rate measurement procedure with its own detector behavior and limit structure.
The ESW-K59 specifications visible at the booth:
→ Simultaneous and gapless measurement of all four frequencies — the four CISPR 14-1 measurement frequencies captured concurrently
→ Up to four hours of measurement time — long enough to capture statistically representative samples of low-frequency switching events
→ Pass/Fail result visualization with details for each channel
→ Intuitive user interface for detailed analysis and reporting for CRA measurements
The inclusion of click rate analysis in an exhibition booth focused on 44 GHz compliance testing is instructive. It signals that the R&S ESW platform's application range spans from sub-kHz switching disturbances through microwave frequencies — a single receiver architecture covering the complete electromagnetic disturbance spectrum of a complex product.
What the Complete System Is Saying
The R&S booth at Cologne presented not a collection of individual instruments but a complete automated compliance test system architecture:
→ R&S ESW EMI Receiver (11 Hz – 44 GHz): the core measurement engine, two units for parallel band coverage
→ ESW-B1000 Wideband Extension: 510 MHz FFT bandwidth for gapless CISPR Band C+D measurement
→ HF1444G14 High-Gain Microwave Antenna: the measurement antenna calibrated for 44 GHz compliance
→ ESW-K59 Click Rate Analyzer: extending coverage to CISPR 14-1 discontinuous disturbances
→ Robot arm antenna positioning: automated, repeatable, sub-millimeter precision at all frequencies
→ Semi-anechoic chamber with motorized turntable: controlled measurement environment
The argument this system is making is about frequency ceiling and automation depth simultaneously. Taking a compliance test system to 44 GHz is a hardware and antenna challenge. Running it autonomously — with robot-positioned antenna, automated turntable, parallel two-receiver measurement, and software-driven test sequences — is an operational challenge. The R&S booth was showing both challenges solved in a single integrated setup.
The frequency ceiling of 44 GHz is relevant because emissions from automotive radar (77 GHz approached from below), 5G FR2 mmWave devices, and high-speed serial interfaces now reach into this range and require compliance characterization. Products that previously needed only sub-GHz radiated emissions measurement are generating energy in ranges that their certification did not historically address. The test equipment has to keep pace.
The robot arm is the visible symbol of where that test equipment is heading: fully automated, human-out-of-the-loop for routine measurements, with the engineer's role shifting from operating the instruments to interpreting the results they generate autonomously.
Instruments observed: Rohde & Schwarz ESW EMI Test Receiver · 11 Hz – 44 GHz · R&S® ESW-B1000 Wideband Extension (510 MHz FFT bandwidth) · R&S® HF1444G14 High-Gain EMI Microwave Antenna · R&S® ESW-K59 Click Rate Analyzer · automated robot arm antenna positioning system · miniature semi-anechoic compliance test setup
All photos: Thomas · @SignalByThomas