HOBO UX120 4-Channel Pulse Logger

A versatile logger for measuring up to 4 pulse inputs. Suitable for use with a range of energy monitoring sensors.



  • Simultaneously measures and records pulse signals, events, state changes, and runtimes
  • Two memory options: UX120-017 - 500,000 measurements and UX120-017M - 4,000,000 measurements
  • Maximum pulse rate - 120 Hz
  • Pulse input range - 0 to 24VDC
  • Streamlines deployment via a range of start/stop options, logger status LEDs, and high-speed USB 2.0 data offload
  • Works with Onset's E50B2 Energy & Power Meter to measure Power Factor (PF), Reactive Power (VAR), Watt Hours (Wh) and more.
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis


Input Specifications:

  • External Contact Input: Electronic solid state switch closure or logic driven digital signals to 24 V
  • Maximum Pulse Frequency: 120 Hz
  • Maximum State, Event, Runtime Frequency: 1 Hz
  • Bits: 4-32 bits depending on pulse rate and logging interval
  • Maximum Pulses Per Interval: 7,863,960 (using maximum logging rate)
  • Driven Logic Signal: Input Low: ≤ 0.4 V; Input High: 3 to 24 V
  • Absolute Maximum Rating: Maximum Voltage: 25 V DC
  • Minimum Voltage: -0.3 V DC
  • Solid State Switch Closure: Input Low: < 10 KΩ; Input High: > 500 KΩ
  • Internal Weak Pull-Up: 100 KΩ
  • Input Impedance: Solid state switch closure: 100 KΩ pull up; Driven signal: 4.5 KΩ
  • Minimum Pulse Width: Contact closure duration: 500 uS; Driven logic signal: 100 uS
  • Lockout Time: 0 to 1 second in 100 ms steps
  • Edge Detection: Falling edge, Schmitt Trigger buffer
  • Preferred Switch State: Normally open or Logic "1" state


* NOTE: The HOBO UX120-018 Plug Load Logger is only available for 120VAC and not available in New Zealand

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UX120 pulse logger

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