Live and neutral terminals
Each has a specified impedance magnitude of 50 Ω ±20%. This equal L/N loading is the key distinction from the unbalanced VHFU 8802.
VHFB 8801, 30–300 MHz, Balanced VHF-LISN
Balanced VHF-LISN
A balanced RF termination for reproducible mains-cable conditions.
The VHFB 8801 provides a defined RF termination for the EUT AC mains cable during radiated-disturbance measurements. It offers balanced live and neutral impedances and is described as an alternative to a CMAD in CISPR 16-1-4, Edition 5 test configurations.
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Data Sheet
SPECIFICATIONS
30–300 MHzNominal frequency range
50 Ω ±20%Live and neutral magnitude
≥40 dBAE-to-EUT isolation
Product overview
Balanced live and neutral. A separate PE characteristic.
Protective-earth terminal
The PE magnitude limit is ≤0.314 × f Ω, with f in MHz; the phase limit is ≤90°. The datasheet provides separate PE magnitude and phase curves.
Phase-limit source discrepancy
The specification table gives 0° ±11.5° at ≥108 MHz and 0° ±25° below 108 MHz. The plotted limit steps show the opposite frequency assignment. Confirm the applicable phase limits with the manufacturer before acceptance testing.
Application details
Integrate and verify the termination
Installation position
Place the VHF-LISN between the radiated-test-site mains outlet and the EUT mains cable at the point where the cable leaves the test volume.
Test context
The manufacturer identifies CISPR 16-1-4, Edition 5. This is a mains-cable termination for radiated disturbance testing; it is not presented as a conventional conducted-emissions receiver-port LISN.
Optional measurement adapter
Use the IMA 8803 for impedance and isolation verification. Its datasheet describes one-adapter impedance measurement and two-adapter isolation measurement.
Connection overview
See where it fits.
01Test-site mains outlet
02VHFB 8801 at volume boundary
03EUT mains cable
04Equipment under test
The balanced live/neutral terminations and PE characteristic are listed separately. Follow the grounding and cable arrangement required by the test.
Technical data
VHFB 8801 specifications
Ratings, connectors and mechanical details consolidated from the manufacturer’s product page and Rev. A datasheet.
Read the full datasheet →| Nominal frequency range | 30–300 MHz |
|---|---|
| Live-terminal impedance magnitude | 50 Ω ±20% |
| Neutral-terminal impedance magnitude | 50 Ω ±20% |
| L/N phase, specification table at ≥108 MHz | 0° ±11.5°; see source discrepancy note |
| L/N phase, specification table below 108 MHz | 0° ±25°; see source discrepancy note |
| PE-terminal magnitude | ≤0.314 × f Ω; f in MHz |
| PE-terminal phase | ≤90° |
| Isolation, AE–EUT | ≥40 dB |
| Maximum current | 16 A |
| Maximum voltage | 1000 V |
| EUT and AE connectors | 3 × 4 mm safety laboratory jacks |
| Ground connection | 4 mm laboratory jack |
| Standard | CISPR 16-1-4 / Edition 5 |
| Housing | Aluminum |
| Dimensions | 171 × 105 × 55 mm |
| Weight | Typical 760 g |
| Optional accessory | IMA 8803 impedance measurement adapter |
Source discrepancy: L/N phase limits. The specification table and plotted limits assign the 11.5° and 25° bands differently around 108 MHz. Both are retained and identified here; confirm the intended requirement with Schwarzbeck.
Original manufacturer figures
Performance curves
Extracted from the datasheet with axes, legends and limit lines intact. Typical curves characterize the device; use the stated specifications and unit calibration where applicable.
Practical questions
Before you specify the product
What makes the VHFB 8801 balanced?
The live and neutral terminals have the same specified impedance magnitude of 50 Ω ±20%. PE has its own frequency-dependent characteristic.
Which L/N phase tolerance should be used?
The datasheet table and plotted limit steps disagree on the frequency assignment around 108 MHz. Obtain clarification from the manufacturer before using these limits for acceptance testing.
Build the setup
Related products
VHFU 8802Unbalanced VHF-LISN
30–300 MHz
30–300 MHz
Absolute EMC · North American sales
Specify the right setup.
Ask about the VHFB 8801, compatible accessories and your measurement requirements.
Product inquiries for the United States, Mexico and Canada.
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