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  • 1000V AC/DC; 10A AC/DC (with test leads and current jacks); resistance to 50 MΩ; capacitance to 10,000 μF, frequency to 100 kHz; temperature from -40 ℃ to 400 ℃
  • Robust, fast and accurate with manual and automatic ranging, Display Hold, Auto Hold, and Min/Max-Average recording
  • Backlit digital display, analog bar graph, and built-in temperature measurements with included thermocouple.


The 438-II Power Quality Analyzer & Motor Analyzer helps you effectively evaluate electrical and mechanical performance just by hooking up voltage and measuring current, providing you with an unprecedented level of data.
  • Brings key motor analysis parameters like speed, torque and mechanical power and calculates motor efficiency without mechanical sensors
  • Includes full power quality and electrical energy analyzer functionality
  • Highest safety rating in industry; 1000 V CAT III / 600 V CAT IV


  • Two electrically isolated inputs
  • CAT III 1000 V / CAT IV 600 V safety rated
  • 100 MHz bandwidth model
  • 1.25 GS/s
  • Deep memory: 10,000 samples per channel waveform capture so you can zoom in on the details
  • Dedicated 5000 Count digital multimeter in 2-channel models
  • Connect-and-View continuous auto-trigger, single shot, pulse width, and video triggering
  • ScopeRecord roll mode, capture waveform sample data for up to 48 hours
  • TrendPlot, trend measurement readings for up to 22 days
  • Advanced automatic measurements, power (Vpwm, VA, W, PF) and time (mAs, V/s, w/s)
  • IP-51 rated for dust and drip proof to withstand harsh environments
  • Isolated USB ports for memory devices and PC connectivity
  • Li-Ion battery for extended operating timespan: up to 4 hours (BP290 included standard) or up to 8 hour with optional BP291
  • Charge spare battery using optional external battery charger (EBC290)
  • Easy-access battery door to make it easy to swap batteries
  • A handy slot to tether and lock down the oscilloscope while unattended using a standard Kensington® lock


  • Fully Class-A compliant: Conduct tests according to the stringent international IEC 61000-4-30 Class-A standard
  • GPS time synchronization: Correlate data with events or datasets from other instruments with precision
  • Flexible and fully configurable thresholds and scale factors: Allows user to pinpoint specific issues by defining the detailed criteria for detection and recording of disturbances.
  • Uninterrupted power supply (40 minutes): Never miss important events - even record the beginning and end of interruptions and outages to help determine the cause
  • 10 MHz, 6000 Vpk waveform capture: Get a detailed picture of even the shortest event
  • 2 GB data memory: Enables detailed, simultaneous recording of numerous power parameters for long periods of time
  • Comprehensive software included: Provides trend diagrams for root cause analysis, statistical summaries, report writing and real-time data monitoring in the online mode
  • Plug and play: Allows quick setup with automatic sensor detection; sensors are instrument powered, eliminating the need for batteries
  • Rugged field design: Insulated housing and a solid state design with no rotating components enable reliable testing under nearly any conditions


  • Large display
  • Backlight for work in dim areas
  • Min / Max to record signal fluctuations
  • Ergonomic overmolded housing with integrated probe holders
  • Free your hands with the optional TPAK magnetic hanger
  • Auto and Manual ranging
  • Meets Measurement Category 1000 V CAT III and Category IV 600 V safety standards
The 77 IV replaces the 77. Move up to superior utility and safety today.