From: "David V. Corbin" <dvcorbin at optonline.net>
The idea of the 1M resistor (actually, there should be two 1M resistors in
series, in case one fails..
Considering that resistors might open, but rarely short...i would expect
this to actually be parallel....
No, the resistor is there to protect the engineer, not the equipment, hence
series.
Jim.