Agilent / Keysight 8756A Scalar analyzer

The Agilent/Keysight 8756A is a scalar network analyzer for amplitude response measurements of RF and microwave devices. It delivers accurate insertion loss, gain, and return loss data across 10 MHz to 40 GHz, making it suitable for characterizing filters, amplifiers, cables, and similar components.

Technical Specifications

• Frequency Range: 10 MHz to 40 GHz


• Dynamic Range: +10 dBm to −50 dBm


• Display Channels: Two independent channels with separate controls


• Directivity: 40 dB bridges


• Display Resolution: 0.006 dB (display), 0.01 dB (cursor)


• Horizontal Resolution: 401 points


• Sweep Time: ≥150 ms minimum


• Scale Options: 0.1, 0.2, 0.5, 1, 2, 5, 10, 20 dB per division


• Reference Offset (Absolute): −70.00 dBm to +20.00 dBm


• Reference Offset (Ratio): −90.00 dB to +90.00 dB


• Averaging: 2, 4, 8, 16, 32, 64, 128, or 256 traces


• Power Input: 115/230 V ±10%, 48–62 Hz, ~100 W


• Dimensions: 178 mm (H) × 425 mm (W) × 482 mm (D)


• Weight: 21 kg net; 26 kg shipping

Key Features

• Five-key operation with Autoscale function for rapid setup


• Fully programmable via HP-IB for automated test integration


• Nine save/recall registers for measurement configurations


• Direct digital plot output capability


• Full annotated digital display with dual-channel independence


• Transfer formats: ASCII strings and 16-bit integers

Typical Applications

• Insertion loss and gain measurements on RF/microwave components


• Return loss characterization of filters and impedance networks


• Cable loss and transmission line analysis


• Amplifier performance verification across multi-decade frequency spans

Compatibility & Integration The 8756A operates with directional bridges (HP 85020 and 85027 series) for reflection measurements and HP 11664 series detectors for 10 MHz–40 GHz operation. HP-IB control enables integration with sweep oscillators such as the Model 8350B and larger automated test systems.