Rohde & Schwarz ZNB Series Vector Network Analyzers
4 models with full specifications from Rohde & Schwarz.
The Rohde & Schwarz ZNB series of vector network analyzers (VNAs) is designed for characterization of active and passive RF components in development, production, and service applications. All instruments in this family share a standardized chassis and interface, featuring a 12.1-inch touchscreen display and 1 Hz frequency resolution. The primary differentiators among the models are their frequency ranges, maximum port configurations, and output power specifications. This page outlines the technical capabilities of the ZNB4, ZNB8, ZNB20, and ZNB40 to assist technical buyers and RF engineers in selecting the correct configuration for their specific testing requirements.
- Frequency Range
- 9 kHz to 40 GHz
- Display Size
- 12.1-inch WXGA Touchscreen
- Frequency Resolution
- 1 Hz
- Impedance
- 50 Ω
Models in this series
| Model | Type | Dimensions (W×H×D) | Display | Interfaces |
|---|---|---|---|---|
| ZNB4 | Vector | 461 mm × 240 mm × 351 mm (with handles and feet) | 12.1" high-resolution touchscreen | USB, LAN, GPIB (optional) |
| ZNB8 | Vector | 461 mm × 240 mm × 351 mm | 12.1" high-resolution touchscreen | LAN, USB, GPIB (optional) |
| ZNB20 | *misc | 461 mm × 240 mm × 351 mm | 12.1-inch TFT color touchscreen, WXGA (1280 x 800 pixels) | LAN (10/100/1000Base-T), USB 2.0 (4 front, 4 rear), GPIB (optional R&S ZNB-B10), External Monitor (DVI-D, DisplayPort), USB Device (Type B), Handler I/O (optional), External Trigger Input/Output, Reference Input/Output |
| ZNB40 | Vector | 461 mm × 240 mm × 351 mm | 12.1" WXGA color TFT touchscreen, 1280 × 800 resolution | USB (Host & Device), LAN (Gigabit Ethernet), GPIB (optional), External Monitor (DVI-D / DisplayPort depending on HW), Trigger I/O, Reference I/O |
Frequency Range and Test Port Specifications
The ZNB series models differ significantly in their operational frequency limits and physical RF connector types to support different application bands:
- ZNB4: Operates from 9 kHz to 4.5 GHz. It uses standard N female test port connectors.
- ZNB8: Covers a frequency range from 9 kHz up to 8.5 GHz, also utilizing N female test port connectors.
- ZNB20: Operates from 100 kHz to 20 GHz. This model uses ruggedized 3.5 mm male test port connectors.
- ZNB40: Designed for high-frequency measurements, this analyzer covers 10 MHz to 40 GHz (with a minimum frequency of 100 kHz in its base configuration).
The ZNB4, ZNB20, and ZNB40 can be configured with either 2 or 4 physical test ports, depending on hardware options. All models maintain a standard port impedance of 50 Ω.
Power Levels and Dynamic Range
Power and sensitivity profiles are optimized across the series for varied testing needs:
- ZNB4: Features a dynamic range of up to 140 dB. Its standard output power range spans from -55 dBm to +13 dBm, which can be extended down to -85 dBm with the addition of the Option B22 hardware configuration.
- ZNB8: Supports standard output power ranges from -55 dBm to +10 dBm (up to 7.5 GHz) and -55 dBm to +8 dBm (up to 8.5 GHz). The optional B22 hardware configuration extends the minimum output level to -85 dBm.
- ZNB20: Delivers up to 135 dB dynamic range (typical at 10 Hz IF bandwidth) with an output power range from -85 dBm to +10 dBm.
- ZNB40: Highly stable, this model features a trace noise magnitude of less than 0.005 dB RMS and a trace noise phase of less than 0.05° RMS (measured at 10 kHz IF bandwidth). It can withstand up to +27 dBm of RF input and 30 V DC.
Chassis, Interfaces, and Weight
All models share a common physical footprint with dimensions of 461 mm × 240 mm × 351 mm. They are designed to operate in temperatures ranging from +5 °C to +40 °C. Every model in the series includes standard LAN and USB interfaces, with GPIB control available as an option.
Weight varies by configuration: the ZNB4 weighs 13.5 kg as a 2-port unit and 16.3 kg as a 4-port unit. The ZNB8 weighs 13.7 kg. The ZNB20 base 2-port model is 13.9 kg, while the 2-port ZNB40 weighs 16.2 kg.
Frequently asked questions
- What is the maximum frequency capability in the ZNB series?
- The ZNB40 offers the highest frequency range in the series, operating up to 40 GHz.
- Do the ZNB analyzers support GPIB?
- Yes. GPIB is available as an optional interface across the ZNB4, ZNB8, ZNB20, and ZNB40 models.
- How low can the output power go on the ZNB4 and ZNB8?
- Both the ZNB4 and ZNB8 have a standard minimum output power of -55 dBm, which can be extended to -85 dBm by utilizing the Option B22 hardware configuration.