The Keysight (Agilent) 1157A is a 2.5 GHz active probe engineered for high-speed signal acquisition in digital, analog, and RF circuit characterization. Its high input impedance (100 kΩ) and ultra-low input capacitance (0.8 pF) minimize circuit loading, preserving signal integrity during measurement. The probe delivers 140 ps rise time and supports voltage offsets to ±15 V, accommodating a 5 V peak-to-peak dynamic range—extending to >12 V peak-to-peak for slower edges (>3 ns). Integrated resistive damping near the probe tip maintains flat frequency response by suppressing resonance artifacts. AutoProbe Interface compatibility enables automatic oscilloscope setup, streamlining workflow in production and lab environments.
Technical Specifications
• Bandwidth: 2.5 GHz
• Input Impedance: 100 kΩ, 0.8 pF (non-resonant, frequency-dependent)
• Rise Time: 140 ps (typical)
• Voltage Offset: ±15 V
• Dynamic Range: 5 V peak-to-peak (standard); >12 V peak-to-peak for edges exceeding 3 ns
– Key Features
• Non-resonant input impedance with integral resistive damping suppresses ringing and maintains response flatness across the full bandwidth
• Compact form factor for access to confined test points and high-density assemblies
• Broad accessory suite: resistive signal pins (110 Ω, 130 Ω variants), solderable ground sockets, SMT and through-hole ground pins, micro clips, and multiple lead lengths (5 cm, 10 cm)
• AutoProbe Interface integration for plug-and-play configuration with compatible oscilloscopes
– Typical Applications
• High-speed digital signal integrity verification
• Analog circuit characterization and debug
• RF and microwave measurements requiring minimal loading
• Edge timing and pulse analysis
– Compatibility & Integration
The 1157A is compatible with Keysight Infiniium Series, InfiniiVision 5000, 6000 (100 MHz models excluded), and 7000 Series oscilloscopes, including the 54800 Series platform.
