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.
