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Extech MS420: 20MHz 2-Channel Digital Oscilloscope

Dual-channel Oscilloscope with 3.8″ (97mm) color LCD display

Extech’s MS420 20 MHz 2-Channel Digital Oscilloscope offers a range of capabilities for effective troubleshooting of electronics and electronically controlled electrical systems. With 20 MHz bandwidth and conveniences like auto-set which optimizes the position, range, time base, and triggering to assure a stable display of virtually any waveform, the MS420 can be used in field repairs or bench duty. To identify subtle problems, Peak Detect features a fast 50 ns glitch capture. Core functions like XY Mode, FFT function, Trigger Hold off, Waveform Math, Averaging Mode and Persistence Mode all ensure you can confidently troubleshoot problems using a variety of approaches. To start up recurring testing routines, you can store and recall up to 4 waveform screens and setups to save time from job to job. This CAT II-rated oscilloscope extends its functionality with complete DMM functions that are displayed on the large 3. 8″ (97mm) color LCD display. The MS420 comes with two 1X/10X oscilloscope probes, test leads, Windows XP/Vista compatible USB software and cable, capacitor measuring module, adjustment screwdriver, AC adaptor/charger, hard carrying case, user manual, and manufacturer’s one-year limited warranty.



  • Auto-set function optimizes the position, range, timebase, and triggering to assure a stable display of waveforms
  • Peak Detect function for 50ns glitch capture
  • XY Mode and FFT function to view component frequencies
  • Twenty Automatic Measurements including Frequency, Cycle, Average, Peak to Peak, RMS and more
  • Waveform Math: Add, Subtract, Multiply, and Divide
  • Average Mode for smoothing waveforms
  • Persistence Mode for observing dynamic signals
  • Store and recall up to 4 waveform screens and setups
  • USB interface and software for transferring waveforms and data


Specifications Range
Display Size 3.8″ (96mm) color LCD; 320 x 240 pixels
Bandwidth 20MHz
Real time sample rate 100MS/s
Risetime 17.5ns
Channels 2
Record Length 6K points per channel
Glitch Capture 50ns
Vertical Sensitivity 5mV to 5V/div
Vertical Resolution 8 bits
Timebase Range 5ns to 5s/div
Sample Mode Sample, Average, Peak Detect
Trigger Modes Free Run, Single Shot, Edge, Video
Trigger Source CH1, CH2
Trigger Coupling AC, DC
Input impedance 1MΩ/20pF
Max Input Voltage 400V (peak)
Cursor Measurement Voltage and time
True RMS MultiMeter Functions
AC/DC Voltage 400mV, 4V, 40V, 400V
AC/DC Current 40mA, 300mA, 20A
Resistance 400Ω, 4kΩ, 40kΩ, 400kΩ, 40MΩ
Capacitance 51.2nF to 100µF
Diode and Continuity Yes
PC Interface USB cable
Power Supply 6 hours Li-ion rechargeable battery; AC Adaptor/charger
Dimensions/Weight 7×4.4×1.6″ (180x113x40mm) / 24.3oz (690g)


MS420 English Datasheet

MS420 English User’s Manual

MS420 CE Declaration of Conformity