🚀 go-pugleaf

I posted a message a while ago concerning a voltage spike I was seeing
on the neutral line.  Well, we seem to have identified the culprate as
a blower motor.

The motor is controlled (by some means I haven't check out yet), as it
regulates the vacuum in a laminar flow hood.  You set the vacuum that
you want (inside the hood relative to the outside) and the motor and
controller work to achieve that hood vacuum.  I think it's an 8 amp
motor.

I think the company that makes the hood is Laminar.  Anyways, with the
blower turned on, there is a voltage spike on the neutral line that is
6 or 7 volts in amplitude and 10 usec in duration and occurrs twice per
AC cycle.

We also found that plugging in a particular unloaded power bar also
cause a smaller voltage spike. (this power bar is a little unique in
that it shuts down its outlets in the event of power outage and then
it must be manually reset).

The powerbar got me wondering if these MOV (metal oxide varistors) are
to blame.  Do they ring when they experience a potential shift?
Could they be the problem (if they are used in the blower control
circuit) or are they part of the solution?