Advantest R5373P Microwave frequency counter

The Advantest R5373P is a microwave frequency counter designed for precision measurement across 10 mHz to 27 GHz. It employs digital TRAHET technology - combining transfer and heterodyne techniques - to deliver high sensitivity and exceptional resolution. The instrument measures frequency, period, time interval, pulse width (minimum 0.5 µs), pulse repetition frequency (10 Hz to 5 MHz), carrier frequency of pulse-modulated signals, and FM deviation.

Resolution reaches 1 Hz in 1 second for microwave frequencies, with decade-selectable settings from 0.1 Hz to 10 MHz and maximum resolution to 0.1 mHz in specific modes. Timebase stability is 1.5 ppm, with accuracy of ±1 count plus time base accuracy. Measurement speed reaches 1000 measurements per second.

Technical Specifications

• Frequency Range: 10 mHz to 27 GHz


• Measurement Modes: Frequency, period, time interval, pulse width, pulse repetition frequency, carrier frequency of modulated signals, FM deviation


• Resolution: 1 Hz (1 second gate, microwave), decade-selectable 0.1 Hz to 10 MHz, maximum 0.1 mHz


• Accuracy: ±1 count ± time base accuracy ± residual stability (1/10 × measurement frequency in GHz, rms)


• Timebase Stability: 1.5 ppm


• Sensitivity: –35 dBm to +20 dBm


• Measurement Speed: Up to 1000 measurements/second


• FM Range: ±125 MHz (signals ≥1.4 GHz manual); ±25 MHz (500 MHz–1.4 GHz manual); 10 MHz p-p (automatic, worst case)


• Power Supply: 100–240 V AC, 50/60 Hz

Key Features

• Pulse width capability: minimum 0.5 µs


• D-A analog output (–4.995 V to +4.995 V ±20 mV, 100 Ω max impedance)


• 10 MHz timebase output (1 Vp-p min, ~50 Ω)


• External frequency standard inputs: 1, 2, 2.5, 5, 10 MHz (1–10 Vp-p, ~500 Ω)


• Compact form factor: 213 mm (W) × 88 mm (H) × 355 mm (D), 2.8 kg

Typical Applications Microwave communication systems, broadcast equipment, satellite communications, microwave and millimeter-wave circuit testing and calibration.

Compatibility & Integration

• Interfaces: GPIB, RS-232C


• Connectors: 14-pin TTL output (Amphenol 57-40140 equivalent), AUX input/output, BNC (timebase and external standard), SMA or N-type main input