HP / Agilent 5370A UNIVERSAL COUNTER

The HP/Agilent 5370A Universal Time Interval Counter delivers picosecond-level time measurement precision with 16-digit display resolution. This instrument performs frequency, period, and time interval measurements across a 0.1 Hz to 100 MHz range, making it essential for metrology, telecommunications, and precision frequency standards work.

Technical Specifications Measurement Performance

Time interval resolution: ±20 ps single-shot

Frequency range: 0.1 Hz to 100 MHz

Frequency and period measurements with high resolution

16-digit display with suppressed leading zeros Input Characteristics

Input sensitivity: 100 mV p-p, 35 mV rms sine wave (x attenuator setting)

Input impedance: Selectable 1 MΩ // 30 pF or 50 Ω nominal

AC or DC coupling via front-panel switch

Trigger level: −1.3 V to 0.5 V, 10 mV displayed resolution

Trigger slope: Independent positive or negative slope selection

Attenuators: X1 and X10 nominal Dynamic Range

At 50 Ω: X1 (100 mV to 1 V p-p), X10 (1 V to 7 V p-p)

At 1 MΩ: X1 (100 mV to 1 V p-p), X10 (1 V to 10 V p-p) Data Output & Throughput

HP-IB: 10–20 readings per second (330 µs dead time)

Fast Binary: 6 kHz (165 µs dead time) Statistical Analysis

Mean, standard deviation, maximum, and minimum calculations

Key Features

Flexible arming modes: internal, external, and external with hold-off gating

Hold-off function prevents measurement restart until external gate signal removal

Selectable input impedance for 50 Ω or high-impedance applications

Programmable control via HP-IB for automated test integration

Accommodates external time base standards for enhanced stability

Electrical & Physical

Power: 100, 120, 220, or 240 V AC ±5%–10%, 48–66 Hz, <250 VA

Dimensions: 133 mm H × 426 mm W × 521 mm D

Weight: 32 lbs; supplied with front handles

Compatibility & Integration The 5370A accepts external time base standards. The HP 10811-60111 OCXO option provides enhanced frequency stability. Users seeking integrated OCXO functionality should evaluate the 5370B model, which incorporates the 10811 oscillator and improved firmware.