Description
Product description
EMCgear PNFA is a portable near-field analyzer and RF power meter designed for fast EMI troubleshooting and comparative RF measurements from 1 MHz to 4 GHz.
It combines calibrated RF power measurement with selectable input filtering, direct numerical indication and intuitive visual, acoustic and haptic feedback. The compact battery-powered design makes PNFA particularly suitable for development laboratories, EMC debugging, pre-compliance investigation and quick measurements directly at the device under test.
Four selectable RF filter paths divide the operating range into practical frequency bands corresponding to CISPR bands B, C, D and E. Full-band operation can automatically compare the available bands, while fixed-frequency high-precision mode applies frequency-dependent correction when the signal frequency is known.
Measurements can be displayed directly on the integrated OLED in Numeric or Graph mode. For extended monitoring, recording and analysis, PNFA can be connected by USB to the downloadable PNFA Monitor application for Windows.
Features
- Wide operating frequency range from 1 MHz to 4 GHz
- Approx. −75 to +20 dBm total measurement range
- Effective dynamic range up to 95 dB
- Calibrated RF power measurement from −50 to +20 dBm
- Four selectable RF input filters for improved out-of-band rejection
- Filter paths corresponding to CISPR bands B, C, D and E
- Full-band comparison and fixed-frequency high-precision measurement modes
- Direct input and Internal Attenuator gain modes
- Sample, Average, Peak and Max Hold processing
- Numeric and graphical level display
- Acoustic signal-level indication with Tone and Geiger modes
- Haptic signal-level feedback
- Power display in dBm or watts
- Calculated 50 Ω Vrms and Irms indication
- USB-C charging and computer interface
- Windows PNFA Monitor application for remote measurement, graphing, logging and data export
- High-precision CNC-machined aluminum enclosure with protective blue anodizing
Measurement modes
Wideband / Filter mode
PNFA provides four selectable input-filter paths covering the complete operating range. Individual bands can be selected manually, or Full band mode can compare all four paths and indicate the strongest result.
Fixed frequency / High precision mode
For signals with a known frequency, the frequency can be entered from 1 to 4000 MHz. PNFA automatically selects the corresponding RF path and applies frequency-dependent measurement correction.
Numeric and Graph display
Numeric mode provides a large direct level indication and live level bar. Graph mode displays signal level versus time and is useful for observing variations while moving a near-field probe or monitoring intermittent RF activity.
Acoustic and haptic feedback
Signal level can be followed without continuously watching the display. Audio pitch or Geiger-style click rate and haptic pulse density increase with signal level, making PNFA particularly convenient for locating emission hot spots.
Technical parameters – General
| Operating frequency range | 1 MHz to 4 GHz |
| RF input impedance | 50 Ω nominal |
| RF input connector | SMA female |
| Total measurement range | Approx. −75 to +20 dBm |
| Effective dynamic range | Approx. 95 dB |
| Calibrated measurement range | −50 to +20 dBm |
| Effective calibrated dynamic range | 70 dB |
| Absolute RF power accuracy, 1 MHz–3 GHz | Typ. ±0.2 dB; max. ±0.5 dB |
| Absolute RF power accuracy, 3–4 GHz | Typ. ±0.4 dB; max. ±1.0 dB |
| Selectable gain | Direct input / Internal attenuator |
| Display | 128 × 64 OLED, white on black |
| Display modes | Numeric / Graph |
| Feedback | Acoustic and haptic |
| Displayed units | dBm / W / Vrms / Irms |
| Maximum RF input power | +25 dBm |
| Maximum DC voltage at RF input | ±5 V* |
| Power supply / charging | USB-C input, 5 V / max. 500 mA |
| Enclosure | High-precision CNC-machined aluminum case |
| Surface finish | Protective blue anodizing |
| Weight | Approx. 70 g |
* External DC bias on the RF input should be avoided. An external DC block is recommended when DC may be present.
Selectable RF filter bank
| CISPR band B | Low-pass | < 30 MHz |
| CISPR band C | Band-pass | 30 to 300 MHz |
| CISPR band D | Band-pass | 300 to 1000 MHz |
| CISPR band E | High-pass | 1000 to 4000 MHz |
RF filter characteristics
| Input-filter passband flatness – LP | Typ. ±1 dB |
| Input-filter passband flatness – BP1 | Typ. ±0.7 dB |
| Input-filter passband flatness – BP2 | Typ. ±1 dB |
| Input-filter passband flatness – HP | Typ. ±3 dB |
| Input return loss – LP | Typ. >30 dB |
| Input return loss – BP1 | Typ. >20 dB |
| Input return loss – BP2 | Typ. >15 dB |
| Input return loss – HP | Typ. >10 dB |
Near-field probe kit NFPP
The optional NFPP Near-Field Probe Kit is designed for practical localization and comparison of electromagnetic emission sources together with PNFA.
The set contains four near-field probes:
- H-field probe – 6 mm sensing loop diameter
Small magnetic-field loop intended for high spatial resolution and precise localization of individual traces, component pins, switching nodes and other concentrated current paths. - H-field probe – 12 mm sensing loop diameter
Medium-size magnetic-field loop providing a practical compromise between spatial resolution and sensitivity for general PCB-level EMI troubleshooting. - H-field probe – 21 mm sensing loop diameter
Large magnetic-field loop intended for faster scanning of larger PCB areas and detection of weaker or more spatially distributed magnetic-field sources. - E-field probe – 4 mm sensing tip length
Electric-field probe intended for locating areas with strong electric-field coupling, including high-voltage nodes, clock signals, switching nodes and other high-impedance RF sources.
The three H-field loop sizes allow the measurement approach to be progressively refined: a larger loop can first be used for rapid area scanning, followed by smaller loops for increasingly precise localization of the emission source.
The NFPP probe set is included with the PNFA Near Field Kit and PNFA Complete Kit variants.
Optional 20 dB RF attenuator
An external RF attenuator is available for measurements requiring additional input attenuation.
| Nominal attenuation | 20 dB |
| Frequency range | DC to 6 GHz |
| Peak power rating | Max. 10 W |
| Long-term power rating | Typ. 2 W |
| SWR | ≤ 1.25 |
The attenuator is included with the PNFA RF Power Kit and PNFA Complete Kit variants.
PNFA Monitor software
The downloadable PNFA Monitor application extends PNFA with computer-controlled measurement and data recording.
- Fixed-frequency high-precision measurement
- Simultaneous display of all four wideband filter paths
- Numeric level indication and time graphs
- Sample, Average, Peak and Max Hold processing
- Adjustable measurement aperture and graph time window
- CSV data logging
- Graph and measurement-data export
- Save and load measurement workspaces
- Instrument identification and diagnostic information
Supported operating systems: Windows 10 and Windows 11.
Product variants
| PNFA | PNFA | Portable Near Field Analyzer / Power Meter, 1 MHz to 4 GHz USB-C charging/data cable Hard transport case with foam inserts Factory calibration / test report Downloadable PNFA Monitor application |
| PNFA RF Power Kit | PNFA-ATT20 | Portable Near Field Analyzer / Power Meter, 1 MHz to 4 GHz USB-C charging/data cable 20 dB / 10 W / 6 GHz external RF attenuator Hard transport case with foam inserts Factory calibration / test report Downloadable PNFA Monitor application |
| PNFA Near Field Kit | PNFA-NFPP | Portable Near Field Analyzer / Power Meter, 1 MHz to 4 GHz USB-C charging/data cable NFPP Near-Field Probe Kit – 3× H-field + 1× E-field probe Hard transport case with foam inserts Factory calibration / test report Downloadable PNFA Monitor application |
| PNFA Complete Kit | PNFA-NFPP-ATT20 | Portable Near Field Analyzer / Power Meter, 1 MHz to 4 GHz USB-C charging/data cable NFPP Near-Field Probe Kit – 3× H-field + 1× E-field probe 20 dB / 10 W / 6 GHz external RF attenuator Hard transport case with foam inserts Factory calibration / test report Downloadable PNFA Monitor application |
Scope of delivery
Every PNFA configuration includes:
- PNFA Portable Near Field Analyzer / Power Meter, 1 MHz to 4 GHz
- 1 m USB-C to USB-A charging/data cable
- Hard transport case with foam inserts
- Factory calibration report / test report
- Downloadable PNFA Monitor application for Windows
Additional accessories depend on the selected product variant.
Conformity
European Union
- EMC Directive 2014/30/EU
- EN IEC 61326-1
- EN IEC 61326-2-1
- EN 55011 / CISPR 11
USA
- 47 CFR Part 15, Subpart B
PNFA is industrial/commercial test equipment and is exempt from the specific technical standards of FCC Part 15 under 47 CFR §15.103(c).
Warranty
2-year manufacturer warranty.
Intellectual property
The PNFA technical solution is protected by Czech Utility Model CZ 39657 U1.
