Choosing the right near field probe for Rohde & Schwarz analyzers is essential for accurate EMI troubleshooting and radiated emissions measurements. These probes connect field strength meters with your test equipment, so you need reliable data, robust construction, and smooth integration with Rohde & Schwarz platforms.
This guide walks through specification priorities, compatibility checks, and workflow tips that help you select the best near field probe for Rohde & Schwarx instruments without costly mistakes.
| Model | Frequency Range | Connector Type | Impedance | Typical Sensitivity |
|---|---|---|---|---|
| EH-010 | 9 kHz–3 GHz | BNC | 50 Ω | –50 dBm |
| EH-011 | 2 GHz–4 GHz | SMA | 50 Ω | –45 dBm |
| EH-012 | 2 GHz–18 GHz | 2.4 mm | 50 Ω | –30 dBm |
| EH-016 | 8 GHz–20 GHz | 2.4 mm | 50 Ω | –35 dBm |
Frequency Range And Application Coverage
Low Band Options For Conducted And Near Field Transition
If your work involves conducted emissions that radiate into nearby structures, choose a probe starting near 9 kHz, such as the EH-010. This range supports harmonized standards measurements and helps you trace interference paths from wiring to radiated fields.
High Band Options For Device Under Test Debugging
For modern digital designs, cellular radios, and radar components, select a probe covering 2–18 GHz with small connectors like 2.4 mm. These models keep calibration predictable at high frequencies and match the ports found on many Rohde & Schwarz spectrum analyzers and EMI receivers.
Connector And Cable Compatibility
Matching Instrument Ports Without Adapters
Confirm that the near field probe uses the same connector found on your Rohde & Schwarz analyzer ports, whether that is BNC, SMA, or 2.4 mm. Direct connection minimizes mismatch, preserves frequency response, and reduces the need for additional adapters that can dampen signals or add reflections.
Rugged Cabling For Field Work
Field probes often endure harsh environments, so braided or semi-rigid cables with strain relief protect calibration and prevent intermittent faults. Pair the probe with cables rated for the same impedance and higher power handling to ensure long-term accuracy during repeated compliance testing.
Calibration Traceability And Correction Workflow
Factory Calibration Data For Quantitative Results
Select probes with clearly documented calibration certificates that include frequency, deviation, and correction coefficients. These documents allow you to apply manufacturer corrections inside your Rohde & Schwarx software, so your display values reflect real field strength in V/m or dBµV/m.
Verification And Recalibration Planning
Establish a recalibration schedule based on workload and environment. High-use probes in manufacturing or site surveys should be checked every 6–12 months, while low-use lab probes may only need annual verification to maintain uncertainty budgets aligned with your test standards.
Recommendations For Accurate Radiated Emissions Testing
- Verify frequency coverage against your device’s highest switching edge before purchase.
- Prefer probes with calibration certificates and access to correction data for Rohde & Schwarx software.
- Use low-capacitance probes when measuring fast edges to avoid changing circuit behavior.
- Select robust cabling and strain relief for field work to preserve calibration and repeatability.
FAQ
Reader questions
How Do I Select The Right Near Field Probe Bandwidth For Rohde & Schwarz EMI Receivers?
Match the probe upper frequency to the highest device emission you expect, while ensuring the Rohde & Schwarz receiver covers a similar range, and keep at least 3–6 GHz of guard band for future products.
Can I Use The Same Near Field Probe Across Multiple Rohde & Schwarz Models?
Yes, provided the connector type and impedance align with each analyzer, and the calibration file or correction data is loaded for that specific instrument family.
What Field Strengths Can I Measure With EH-010 And EH-012 Probes?
EH-010 is suited for low-level diagnostics down to –50 dBm, while EH-012 handles higher power with a –30 dBm sensitivity ceiling, making it better for quick scanning of radiated emissions without saturating the front end.
Are Active Probes Better Than Resistive Probes For Modern Digital Boards?
Active probes offer lower loading on high-impedance nodes and better common-mode rejection, which is valuable when troubleshooting small digital signals near high-current circuits on the same board.