Keysight (Agilent) 53210A 350 MHz RF Frequency Counter

The Keysight 53210A is a single-channel RF frequency counter delivering 10-digit resolution measurements from 0.1 Hz to 350 MHz. Built for research, development, and manufacturing environments, it combines fast measurement speeds - up to 1 million readings per session - with versatile triggering and analysis capabilities. The instrument features a 4.3" color graphical display, comprehensive statistical functions, and data logging up to 1 million readings.

Built-in math analysis generates trend plots and histograms for rapid signal characterization. A standard TCXO timebase ensures stable measurements; an optional ultra-high-stability OCXO is available for demanding applications. Sensitivity reaches 10 mVrms across the 1 MHz to 350 MHz band, with switchable 1 MΩ or 50 Ω input impedance and AC/DC coupling.

The 53210A integrates into automated test systems via LXI-C/Ethernet, USB, and GPIB interfaces. An optional internal lithium-ion battery maintains operation during field work and preserves timebase accuracy. Optional microwave channels extend measurement capability to 6 GHz or 15 GHz.

Technical Specifications

• Baseband: 0.1 Hz to 350 MHz


• Optional microwave channels: 6 GHz or 15 GHz Measurement Performance


• Resolution: 10 digits/second


• Measurement speed: Up to 1 million readings


• Sensitivity: 10 mVrms (1 MHz to 350 MHz); 20 mVrms (DC to 100 MHz); 40 mVrms (>100 MHz)


• Input impedance: 1 MΩ parallel with <25 pF, or 50 Ω (switchable)


• Input coupling: AC or DC


• Maximum input voltage: 50 V


• Minimum input voltage: 5 V Timebase Accuracy


• Standard: TCXO


• Optional: Ultra-high-stability OCXO Display


• 4.3" color TFT WQVGA (480 × 272), LED backlight Physical


• Dimensions: 103.8 mm H × 261.1 mm W × 302.2 mm D


• Weight: 3.9 kg


• Operating temperature: 0°C to 55°C

Key Features

• Primary measurements: frequency, period, frequency ratio, max/min/peak-to-peak input voltage


• Optional measurements: carrier frequency, pulse repetition frequency (PRF), pulse interval repetition, carrier width


• Statistical analysis: current value, minimum, maximum, mean, standard deviation, peak-to-peak, count


• Data logging with trend and histogram graphing


• Test flow function for custom procedure development


• x10 attenuator for extended voltage range triggering

Typical Applications

• RF and microwave frequency verification


• Signal integrity and timing analysis


• Production test and characterization


• Research and development measurements

Compatibility & Integration

• Standard interfaces: LXI-C/Ethernet, USB, GPIB


• Optional rear-panel parallel inputs for baseband channels


• Optional microwave input connectors: Type N (front) or SMA (rear panel)


• AC power supply; optional internal lithium-ion battery and charger