The 4141 series uses dual-channel cross-correlation for phase-noise, amplitude-noise, baseband-noise and transient characterization of signal sources. It also provides spectrum monitoring, frequency/power measurement and DC supply/tuning outputs. Models B, E and F extend to 7 GHz, 26.5 GHz and 40 GHz respectively. Starting frequencies, offset ranges and conditions depend on the measurement mode.
Models and selection parameters
| Model | Standard frequency range | RF input | Maximum weight | Maximum power |
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| 4141B | 10 MHz–7 GHz | N female | ≤25 kg | ≤400 W |
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| 4141E | 10 MHz–26.5 GHz | 3.5 mm male | ≤26 kg | ≤450 W |
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| 4141F | 10 MHz–40 GHz | 2.4 mm male | ≤26 kg | ≤450 W |
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General specifications
| Parameter/frequency | Specification |
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| Measurement principle | Dual-channel cross-correlation |
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| Measurement functions | Phase noise, amplitude noise, baseband noise, transients, spectrum monitoring, frequency/power |
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| Phase-noise input power range | −20…+20 dBm |
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| LCD display | 8.4 inches, standard |
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| Display viewing angle | 170° |
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| External interfaces | LAN / GPIB / USB / VGA |
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| W×H×D, excluding external fittings | 430 × 179.5 × 462 mm |
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| W×H×D, including external fittings | 522 × 192.5 × 552 mm |
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| Mains supply | Single-phase 220 V, 50 Hz |
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| Operating temperature | 0…+40 °C |
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| Storage temperature | −40…+70 °C |
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| Timebase aging | ±5×10⁻⁷/year after 30 days continuously powered |
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Frequency ranges by measurement mode
| Model | Measurement mode | Frequency range |
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| 4141B | Wideband phase-noise mode | 250 MHz–7 GHz |
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| 4141B | Wideband transient mode | 50 MHz–7 GHz |
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| 4141B | Amplitude-noise mode | 60 MHz–7 GHz |
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| 4141E | Wideband phase-noise mode | 250 MHz–26.5 GHz |
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| 4141E | Wideband transient mode | 50 MHz–26.5 GHz |
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| 4141E | Amplitude-noise mode | 60 MHz–26.5 GHz |
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| 4141F | Wideband phase-noise mode | 250 MHz–40 GHz |
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| 4141F | Wideband transient mode | 50 MHz–40 GHz |
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| 4141F | Amplitude-noise mode | 60 MHz–40 GHz |
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Phase-noise offsets and accuracy
| Mode/metric | Carrier or offset condition | Range/specification |
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| Standard mode | 10 MHz ≤ fc < 50 MHz | 1 Hz–5 MHz |
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| Standard mode | 50 MHz ≤ fc < 100 MHz | 1 Hz–20 MHz |
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| Standard mode | 100 MHz ≤ fc < 750 MHz | 1 Hz–40 MHz |
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| Standard mode | fc ≥750 MHz | 1 Hz–100 MHz |
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| Wideband mode | 250 MHz ≤ fc < 375 MHz | 1 Hz–20 MHz |
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| Wideband mode | fc ≥375 MHz | 1 Hz–40 MHz |
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| Standard-mode accuracy | 100 Hz–1 kHz | ±3 dB |
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| Standard-mode accuracy | 1 kHz–40 MHz | ±2 dB |
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| Standard-mode accuracy | 40 MHz–100 MHz | ±3 dB |
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| Spurious response | 1 kHz < offset < 100 MHz | <−65 dBc |
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Standard-mode phase-noise sensitivity
Units: dBc/Hz, standard mode. Input frequency must be within the selected model range.
| Input frequency | 1 kHz | 10 kHz | 100 kHz | 1 MHz | 10 MHz | 40 MHz | 100 MHz |
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| 10 MHz | -148 | -156 | -166 | -168 | — | — | — |
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| 100 MHz | -147 | -156 | -163 | -168 | -170 | — | — |
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| 1 GHz | -128 | -137 | -144 | -160 | -170 | -168 | -169 |
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| 3 GHz | -118 | -127 | -133 | -149 | -163 | -164 | -165 |
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| 10 GHz | -109 | -117 | -124 | -140 | -154 | -155 | -156 |
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| 20 GHz | -101 | -113 | -119 | -134 | -144 | -148 | -148 |
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| 26.5 GHz | -95 | -110 | -115 | -128 | -140 | -143 | -143 |
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| 40 GHz | -88 | -103 | -109 | -122 | -135 | -132 | -132 |
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Spectrum monitoring
| Item | Specification/frequency | Conditions |
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| Measurement span | 10 MHz ≤ fc < 100 MHz | 20% of carrier frequency |
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| Measurement span | fc ≥100 MHz | 20 MHz |
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| Resolution bandwidth | 1 Hz–1 MHz | 1, 2, 3, 10 steps |
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| Relative measurement accuracy | ±1.5 dB | −60 dBm carrier relative to −10 dBm carrier |
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Frequency and power measurement
| Item | Specification/frequency | Conditions |
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| Frequency resolution | 1 Hz–1 MHz | Decade steps |
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| Frequency accuracy | ±(frequency resolution + timebase error) | Within selected model frequency range |
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| Power accuracy | ±0.5 dB | 30 MHz ≤ fc ≤3 GHz, power >−10 dBm |
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| Power accuracy | ±1 dB | fc<30 MHz or fc>3 GHz, power >−10 dBm |
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DC supply and tuning outputs
| Parameter/frequency | Specification |
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| Supply-output voltage | 0–16 V |
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| Supply-output resolution | 1 mV |
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| Maximum supply-output current | 80 mA |
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| Tuning-output voltage | −15…+35 V |
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| Tuning-output resolution | 1 mV |
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| Maximum tuning-output current | 20 mA |
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| Tuning-output noise | <10 nVrms/√Hz @10 kHz |
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Amplitude-noise sensitivity
One cross-correlation, 0 dBm carrier power, 1 GHz carrier, 1 Hz start.
| Offset | Sensitivity |
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| 1 kHz | −127 dBc/Hz |
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| 10 kHz | −138 dBc/Hz |
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| 100 kHz | −147 dBc/Hz |
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| 1 MHz | −150 dBc/Hz |
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| 10 MHz | −154 dBc/Hz |
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| 40 MHz | −155 dBc/Hz |
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Transient measurement resolution
| Parameter/frequency | Specification |
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| Power measurement resolution | 0.1 dB |
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Baseband-noise measurement
| Parameter/frequency | Specification |
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| Frequency range | 1 Hz–100 MHz |
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| Measurement power range | <0 dBm |
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| 1 kHz | -151 dBm/Hz |
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| 10 kHz | -158 dBm/Hz |
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| 100 kHz | -160 dBm/Hz |
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| 1 MHz | -160 dBm/Hz |
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| 10 MHz | -160 dBm/Hz |
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| 40 MHz | -156 dBm/Hz |
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| 100 MHz | -156 dBm/Hz |
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Warranty services
| Code | Service | Terms |
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| 4141B-EWT1 | One-year post-warranty extension | Multiple units for multiple years; excludes calibration, one-way freight only |
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| 4141E-EWT1 | One-year post-warranty extension | Multiple units for multiple years; excludes calibration, one-way freight only |
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| 4141F-EWT1 | One-year post-warranty extension | Multiple units for multiple years; excludes calibration, one-way freight only |
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Supplied accessories
| Accessory | Quantity |
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| Standard three-core power cord | 1 |
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| User manual | 1 |
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| Remote-programming manual | 1 |
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| Product conformity certificate | 1 |
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Configuration and supply
- Specifications apply only within the selected model’s actual frequency range. Standard phase noise, spectrum monitoring, frequency/power and narrowband transients start at 10 MHz. Wideband phase noise, wideband transients and amplitude noise have different lower limits, as listed.
- Phase-noise sensitivity columns are offsets and rows are input frequencies, in dBc/Hz. A dash means no value was provided, not zero noise. Amplitude-noise sensitivity uses one cross-correlation, a 0 dBm/1 GHz carrier and a 1 Hz start.
- The baseband <0 dBm value is a measurement power range, not a damage threshold or safe-input guarantee. Supply and tuning outputs have different voltage/current limits.
- Dimensions are stated both excluding and including handles, feet, pads and side straps. The reference photograph is 4141F; RF connector, power and weight follow the selected model.
- Warranty extensions are optional and exclude calibration. Confirm accessories and service terms in the quotation. Provide model/band, noise mode, carrier power, offsets, DC-output needs and services.
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