Agilent / Keysight E1333A 3-Channel Universal Counter

The Agilent/Keysight E1333A is a VXI-based 3-channel universal counter module for frequency, time interval, and event counting within automated test systems. It delivers six core measurement functions - frequency, period average, pulse width, time interval, totalize, and ratio - with three input channels supporting multiplexed operation. The module integrates directly into VXI systems for R&D, manufacturing, and service test environments.

Technical Specifications

• Frequency


• Period Average


• Pulse Width (with Average Mode)


• Time Interval (with Average Mode)


• Totalize


• Frequency Ratio Frequency Measurement


• Maximum frequency: 1 GHz (prescaled by 64 on Channels 1 and 2)


• Range (Channels 1–3): 75 MHz to 1 GHz


• Input coupling: AC coupled


• Input impedance: 50 Ω


• Input range: ±5 Vp


• Sensitivity (75 MHz to 600 MHz): 10 mV


• Dynamic range (75 MHz to 600 MHz): 51 dB Period Average Measurement


• Averages 2^N periods; N range: 1 to 16


• Minimum pulse width: 60 ns


• Resolution: 1 / (10 × 10^6 × 2^N) s Pulse Width Measurement


• Minimum pulse width: 5 ns


• Resolution: (100/2^N) ns; N range: 0 to 7 Time Interval Measurement


• Minimum interval: 200 ns


• Maximum interval: (6871/2^N) s; N range: 0 to 7


• Resolution: (100/2^N) ns Totalizing


• Count range: 1 to (2^36 − 1)


• Minimum pulse width: 5 ns Frequency Ratio Measurement


• Measures ratio between Channels 1 and 2 or Channels 2 and 1


• Resolution: 1/2^N; N range: 6 to 36


• Minimum pulse width: 5 ns Time Base


• Frequency: 10 MHz


• Initial accuracy: 2 ppm


• Aging rate: 2 ppm/year


• Temperature drift: 5 ppm (0 to 50 °C)

Key Features

• Three independent input channels with simultaneous signal conditioning


• Per-channel trigger level and sensitivity controls


• AC-coupled 50 Ω inputs rated ±5 Vp


• Prescaled operation to 1 GHz on all channels


• 10 MHz time base with ±2 ppm initial accuracy

Typical Applications

• Automated frequency and timing measurements in production test


• Multi-channel event counting and pulse characterization


• Ratio and time-interval analysis in systems verification


• Research and service instrumentation requiring VXI integration

Compatibility & Integration

• B-size, 1-slot register-based VXI module


• Compatible with Agilent/Keysight Foundations


• VXI bus interface