We test the PQube 3 design right up to the limit: not just the usual
temperature and humidity extremes like other instrument manufacturers,
but harsh mechanical action (see video at left), many kilovolts of
voltages beyond specification, and beyond-Standard electrostatic
discharge, radiated and conducted EMC, and more. It’s unlikely
that you’ll ever reach these extremes in your application, but
the PQube’s job is to keep recording when something goes wrong.
So we test them very, very harshly.
We work closely with Certification Laboratories like UL
(Underwriters Laboratories), PSL (Power Standards Lab),
TUV Rheinland, and others. Together, we make sure that
the PQube exceeds all of the Standards-based requirements
for safety, immunity to conducted and radiated emissions,
and precision NIST-traceable measurements.
Harsh field experience
You’ll find standard PQubes in the steamy jungles of Papua New Guinea, at
frigid airports in Alaska, on power poles in the hot Alabama summer sun, in
the salt air on tanker ships and oil platforms, even on undersea remotely-piloted
vehicles. We expect this. We design for it. We succeed, so you don’t have to worry.
The micro-PMU – a firmware variant of the PQube 3 – is used in the U.S.
government’s micro-synchrophasor project, and is installed at harsh substation
locations, and on difficult distribution lines, all over the United States.
Despite the environmental challenges, since the full release of the project
there hasn’t been a single failure. Not one. The Principal Investigator for
this project calls this reliability achievement “astounding”. We don’t really
agree – we expect this kind of performance from PQube 3’s – but we’re pleased!
We’ve been doing this for 15 years. We track our failures carefully,
so we can correct them. For an individual PQube, we know that the odds
against a field failure this month is about 1,450 to 1 . (Based on our
experience in the industry, this is about 14 times better than comparable
instruments. You can see why we’re so proud of PQube reliability!)