MCM Electronics

50MHz 7" LCD Digital Storage OscilloscopeMCM Part #: 72-8705  |  Tenma Part #: 72-8705

50MHz 7" LCD Digital Storage Oscilloscope 3.3 stars from 3 reviews.
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Brilliant 7” high resolution widescreen LCD, intuitive controls, and compact size makes using the Tenma 72-8705 oscilloscopes a pleasure.

Product Description


  • Dual analog channels
  • 8-bit A/D converter
  • Automatic waveform and status configuration
  • USB connectivity and storage
  • 6 digits trigger frequency counter
  • Automatic cursor tracing
  • Multiple waveform math functions
  • Edge, pulse, and alternative trigger functions

  • (2) 1:1/10:1 probes
  • User manual
  • USB cable
  • Software

Device software can be downloaded here: 72-8705 Software (.zip, 15.3Mb)

Bandwidth 50 Mhz
Rise Time ≤ 3.5ns
Sample Rate Real time: 1 GS/S; Equivalent: 50GS/s
Vertical sensitivity 1mV~20V/div
Record Length 2 x 600K Sampling Dot (max)
Scan Time Base 2ns ~ 50 s/div
Trigger Type Edge, Pulse, Alternate
Automatic Waveform Measurements 28
Display 7” LCD (400 x 240 pixel resolution)
Dimensions 12”(W) x 5-¾”(H) x 4-4/5” (D)
Weight 4.85 lbs (2.2kg)

Product Reviews

  • "Not worth a dime!" by inhmtech on 4/1/2013
    Overall: 1 out of 5

    I just bought and received one of these. I was really excited to have it because I am in need of a nice, small portable scope. I thought this was going to be great, especially after reading the previous reviews. Well, the unit has so much internal noise, that it is impossible to display a clean waveform. This scope is useless! After 5 minutes with it, I called MCM for an RA and it is boxed up and going back.

  • "Nice scope but some bugs" by bhkoehler on 11/26/2012
    Overall: 4 out of 5

    I purchased 2 of these scopes from MCM in late October 2012 and they seem pretty nice for the money. The wide screen is nice, lots of automatic measurements can be displayed on the screen, and the probes aren't bad. I have noticed some bugs, the cursor knob seems erratic, cursor speed does not correlate to knob rotation speed, and even when knob is rotated at a constant rate the cursor speed across the screen varies widely. Also when using time base settings faster than 500nS/div, the waveform displayed seems to be the last 2 or more waveforms superimposed, the number of waveforms superimposed seems to depend on the time base setting. Not a problem for a stable waveform (you wouldn't notice it) but for a waveform varying in frequency or amplitude the screen shows a blur of overlapped waveforms. This happens with averaging off, and real time mode on, also with equi-time mode on. I looked on MCM's website for firmware upgrades (the Tenma manual shows how to do a firmware upgrade if you can find the files). I could not find any upgrades on MCM's site. I sent MCM a message explaining the bugs and asking about firmware upgrades, but no response after 2 weeks. I do see a firmware upgrade available on Farnell's web site (Version 1.05 is available) but I have not tried this upgrade yet. Has anyone else seen these bugs and have they solved them? MCM needs to improve their product support.

  • "Impressive" by alval43209 on 9/8/2012
    Overall: 5 out of 5

    I have never had a DSO o'scope or one with an LCD; I have always used old style o'scopes since I was in the U.S. Navy 40-years ago. On this one, the screen is easy to read and gives me much more information than my old CRT 'scope. It is very easy to use in the "auto," but I am still trying to learn all the other functionality. It is going to take me a little time to learn, but the manual is extremely helpful. Another plus, this 'scope comes with two very nice standard probes that are easy to calibrate.

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Package Specifications & Dimensions
Weight:7.55 lbs.
RoHS Comp:No
Warranty:90 days
Need to Return?
Length:15 in.
Width:10 in.
Height:8.5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages

MCM Cat 57, Page 1255

MCM Cat 56, Page 1090

PDF Reference

Requires Adobe Acrobat Reader.

Mfr. Info

Tenma Logo
Mfr. Name:Tenma
Mfr. Part Number:72-8705