Agilent / Keysight U1818B Active Differential Probe, 100 kHz to 12 GHz

The Keysight U1818B is an active differential probe designed for high-frequency in-circuit measurements using network, spectrum, and signal source analyzers. It offers a broad bandwidth ranging from 100 kHz to 12 GHz, ensuring excellent measurement accuracy with a flat frequency response of ±1.5 dB. The probe features a low noise floor, specified as less than -130 dBm/Hz at 10 MHz to 12 GHz, which enables measurements on low-amplitude signals.

The U1818B provides convenient biasing directly from the probe power port of Keysight’s RF and microwave instruments or from a separate benchtop power supply, offering user flexibility. This probe is suitable for R&D and quality assurance engineers involved in RF/microwave and high-speed digital design and validation across wireline, wireless communications, and aerospace/defense industries. It is designed for direct compatibility with Keysight’s network, spectrum, and signal source analyzers, allowing for efficient defect detection and analysis.

It’s important to note that the probe head is not included with the U1818B and must be ordered separately, with several compatible InfiniiMax II 12 GHz differential probe heads available, such as the N5380B SMA adapter, N5381B solder-in probe head, N2839A browser, and N5425B/N5426A ZIF probe heads.

### Technical Specifications

**Frequency Range:**
* 100 kHz to 12 GHz

**Bandwidth:**
* Broad bandwidth with a flat frequency response of ±1.5 dB

**Noise Floor:**
* Less than -130 dBm/Hz at 10 MHz to 12 GHz

**Input Characteristics:**
* Differential Input Impedance: 50 kΩ

**Attenuation Ratio:**
* Nominal Probe Attenuation: -10 dB

**Power Requirements:**
* Biasing is conveniently supplied from the probe power port of Keysight’s RF and microwave instruments or from a benchtop power supply

**Common Mode Rejection Ratio (CMRR):**
* < 2 GHz: 35 dB * 2 GHz to 12 GHz: < 30 dB**Environmental Specifications:** * Operating Temperature: 0 to +55 °C * Storage Temperature: -40 °C to 70 °C * Relative Humidity (Operation): 50 to 90% RH at 40 °C, 24 hours cycling, repeated 5 times * Storage Humidity: 90% RH at 65 °C, one 24 hour cycle**Physical Characteristics:** * Dimensions: Not specified in the provided search results. * Weight: Not specified in the provided search results.**Compatibility:** * Designed for direct compatibility with Keysight network, spectrum, and signal source analyzers * Compatible with various Keysight probe accessories, including extreme temperature extension cables, in-line attenuator kits, minimum loss attenuator pads, DC blocking capacitors, and probe positioners**Available Probe Heads (Sold Separately):** * N5380B InfiniiMax II 12 GHz differential SMA adapter * N5381B 12 GHz InfiniiMax differential solder-in probe head * N2839A InfiniiMax II 12 GHz differential browser * N5425B 12 GHz InfiniiMax ZIF-solder-in probe head * N5426A 12 GHz InfiniiMax ZIF-tip–kit of 10### Why Choose Aumictech for Keysight U1818B Active Differential Probe?At Aumictech, we specialize in supplying high-end RF and microwave test and measurement equipment. Whether you need precision signal probing for complex high-speed designs, robust solutions for challenging R&D environments, or reliable instrumentation for quality assurance labs, our team ensures the Keysight U1818B Active Differential Probe delivers maximum performance for your application. We understand the critical nature of signal integrity in demanding applications, and we are committed to providing the technical expertise and quality equipment necessary for your success.