Compliance Update: All Electrical Tests Passed!

I spent Monday at the local TUV testing facility, watching the experts put the Mooshimeter through its paces for safety.  The Mooshimeter has passed its electrical  tests from the 61010-1 and 61010-2-030 safety standards!  Full compliance is just around the corner, and these results let us release several key aspects to manufacturing.

I want to share with you some of what I learned, so I thought I’d detail a few of the many tests below.

They may sound excessive, but we take safety very seriously.  We stand by our CAT III 600V rating, and we are doing everything that is necessary to make sure that you remain safe while using the Mooshimeter when a hazardous situation arises.


Impulse testing validates the meter’s ability to safely handle transient voltages.  These transients might be from e.g. an inductive load kicking up a spike, or even a nearby lightning strike.  Poorly designed equipment can arc over and create a hazardous unintended conductive path.

Transparent PC On Table

We protect against this type of hazard in several ways.  The most visible is the physical isolation provided by the “J” shaped plastic ridge between the batteries and the blue resistor.

For this test, the meter was repeatedly shocked with 6kV pulses from a machine capable of a 3kA short circuit current.  According to the standard, the device can still pass if components overheat and rupture, so long as no further hazard occurs and the insulation stays intact.  The Mooshimeter took it in stride and continued reporting to the iPhone throughout without damage or degradation.

Housing Dielectric

The Mooshimeter is typically operated stand-alone, but can also be a handheld device.  This test checks the meter’s ability to protect and insulate the user from aforementioned transient voltages.

Housing Dielectric Fish

To simulate a hand holding the meter, the housing was wrapped in aluminum foil.  All of the inputs were shorted together, and then 5400VAC RMS was applied for 5 seconds and 3600V for 1 minute.  This test has a peak voltage over 7600V, and there was no detectable current.


It is important that the meter retains its ability to protect you in extreme environmental conditions.  To check this, several thermal tests checked the housing’s ability to handle heat.

In one of those tests, the housing was baked at 120C for an hour while 20N was applied through a 2mm spherical tip.  At the end of the test, the material was checked for deformation.  I asked our testing contact for photos from these tests, this was his response:

I can send a photo, but it won’t show much of anything. The mark was so small, and due to the circular marks from the machining process we had such a hard time locating the impression with the scope that we had to mark it with a marker. So a photo would just look like the enclosure with a blue dot on it.

Next Steps

Tomorrow the Mooshimeter will be baked at 70C for 7 hours and checked for deformation.  After the 120C test I’m not too worried.  That will be the last test we need to perform for compliance testing!

For full compliance we need to have our documentation, safety labeling and paperwork approved.  Fortunately, this can be done in parallel with some of the manufacturing.  We’ll update you on that next!

6 Responses to “Compliance Update: All Electrical Tests Passed!”

  1. Beat July 5, 2014 at 3:44 pm #

    That’s Great news, and an interesting read!

    Thanks for the detailed update!

    Great work!

  2. Redaction July 11, 2014 at 9:28 am #

    Very cool! I can’t WAIT to get my Mooshimeter!

  3. Ken July 14, 2014 at 12:16 pm #

    I see a potential problem on the Mooshimeter PCB. The fuse-holder clips do not have enough clearance to the ground-pour.
    I just ran into this problem in production with a product I work on. The fuse clips are sharp and cut through the solder-mask, and are too close to other PCB traces. The fix was to lift them up.
    In the Mooshimeter pic, don’t see that fuse clip having adequate spacings to the ground fill.

    • Eric VanWyk July 16, 2014 at 8:54 am #

      Ken –
      Good eyes! We’ll take another look, but I believe the horizontal distance is more than sufficient. The perspective on the camera makes it look closer than it is.
      – Eric

  4. Setsuko July 15, 2014 at 11:59 am #

    Way cool! Some very valid points! I appreciate you writing this article and also the rest of the
    site is also really good.


  1. Safety Improvements | Mooshim Engineering - July 30, 2014

    […] the lab with the new enclosures, the high voltage tests were applied again.  As Eric mentioned in this post, the new enclosure passed.  We were very happy and excited, but it was short lived. This was when […]

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