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Compliance Update

I just got off the phone with our friends at Compliance World Wide, and I’m happy to say that the Mooshimeter has passed its first rounds of Emissions and Immunity tests!

Emissions

Emissions testing checks to make sure that the meter does not create radio interference that could impact another device.  We passed this with plenty of margin on the first shot: 11.84dB of worst case margin!

One of many emissions tests. Red line is legal limit. Blue vertical lines with red hashes are the measured emissions from the Mooshimeter.

Emissions testing is done in both normal operation and “test” mode.  In normal operation, the transmitter only spends a few milliseconds on a given frequency before hopping or shutting down again.Test mode sets the radio to constantly transmit on a fixed frequency either a fixed tone or a modulated stream.  We’ve passed in test mode, and normal operation mode tests will be done early next week.

Immunity

Immunity testing checks to make sure that the meter can handle radio interference caused by another device.  As James said on the 19th, we had a hiccup with the internal current shunt channel when the meter was subjected to strong 200MHz interference.  The compliance test lab has verified that the modifications made had the intended effect, and the measurements are no longer affected by this  form of interference.

Immunity Test Chamber

This tested both accuracy and communications.  Across the full range of tests, the Mooshimeter continued to accurately measure and report back to the smartphone: Even when the interference was in the same 2.4GHz band we use to communicate!

ESD

ESD Testing Setup. ESD Gun on the right.

ESD testing tests the meter’s ability to handle static discharge.  The device is hit with an ESD gun that generates high voltage pulses.  For our device, these pulses were either 4kV contact or 8kV air-discharge.  We exhibited “Class A” performance in the ESD test.  This means the unit continued to operate normally when hit by 8,000 Volts.

Side Note: If you are doing ESD testing with a gun that has a separate base unit, make sure the cable running between your gun and your base doesn’t hang next to your leg.  Each time you fire, it is possible that the muscles near that cable will twitch.  A few hours of this can leave you a bit sore!  Fully handheld units don’t have this issue.

What’s Next?

There is one more group of emissions tests to run, and then the prototypes are now being sent to a TUV test facility, where they will be tested for Safety to the 61010-1 and 61010-2-030 specifications.  These standards are required for sale into the European Union, but only recommended for sale here in the States.

These tests ensure the safety of both the end user and the circuit the meter is connected to.  It explicitly tests how the meter handles in specific emergency situations, and makes sure that it does not increase the danger present in those situations.  We’ll go into further detail on these tests when we get our results back from TUV.

One Response to “Compliance Update”

  1. Beat July 5, 2014 at 3:43 pm #

    Thanks for the detailed update!

    Your transparence is really appreciated, and i’m enjoying reading about your advancement!

    Keep the great work going!

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