The Keysight/Agilent/HP 5384A is a dual-channel frequency counter delivering precise measurements from 10 Hz to 225 MHz using interpolar-enhanced reciprocal counting architecture. Channel A covers 10 Hz to 100 MHz with 15 mVrms sensitivity (50 Hz–100 MHz) and 25 mVrms sensitivity (10 Hz–50 Hz). Channel B extends the range to 225 MHz with 10 mVrms sensitivity (50 MHz–200 MHz) and 15 mVrms sensitivity (200 MHz–225 MHz). The instrument resolves up to 9 digits per second and features programmable alphanumeric LCD display with variable digit selection (3 to 11 digits).
Technical Specifications
Frequency Measurement
• Channel A: 10 Hz to 100 MHz
• Channel B: 50 MHz to 225 MHz
• Resolution: 9 digits per second maximum
Input Characteristics
• Channel A sensitivity: 15 mVrms (50 Hz–100 MHz), 25 mVrms (10 Hz–50 Hz)
• Channel B sensitivity: 10 mVrms (50 MHz–200 MHz), 15 mVrms (200 MHz–225 MHz)
• Channel A dynamic range: 45 mV to 4 V pk-pk with attenuator
• Channel B dynamic range: 10 mV to 1 Vrms
• Input coupling: AC
• Channel A impedance: 1 MΩ || <25 pF (X1), 500 kΩ || <25 pF (X20)
• Channel B impedance: 50 Ω nominal
• Channel B damage level: 350 VDC + 5 Vrms AC
Conditioning & Filtering
• Channel A attenuator: X1 or X20 (X40 below 50 Hz)
• Channel B attenuator: Manual variable X1 to X5 (0–14 dB) with auto AGC mode
• Low-pass filter: 100 kHz at 3 dB point
Timebase Performance
• Frequency: 10 MHz
• Aging rate: <3 × 10⁻⁷/month
• Temperature stability: <5 × 10⁻⁶ (0–50 °C, referenced to 25 °C)
• Line voltage stability: <1 × 10⁻⁷ for ±10% variation
– Key Features
• Dual-channel architecture for simultaneous measurements
• Programmable LCD with adjustable resolution and digit display
• AC-coupled inputs with dual-range sensitivity
• Low-pass filtering for noise rejection in low-frequency applications
• Variable attenuation on Channel B with automatic gain control
• Half-rack width form factor supports field, bench, and ATE integration
• External DC operation (9–15 V range)
– Interfaces & Control
• HP-IB (standard)
• HP-IL (optional)
– Available Options
• Option 001: TCXO High Stability Timebase
• Option 004: High Stability Oven Timebase
• Option 005: Battery Pack (four-hour capacity)
