On 9/4/2014 4:56 PM, Ravinder Ajmani wrote:
Most of the products our lab tested were PCs (XT, AT), and peripherals (printers, monitors, Modems, Display Adapters, etc). Printer cable was always a key issue. We would always use Belden cables with the printers, as they were double shielded with proper shield termination. If ferrite clamps were required to pass then the report would state
I was there then too -- and it did not take very long to sink in that selling a computer that uses peripheral cables as RF transmission lines to unshielded printers etc. was a BAD idea!
One "fix" involved bypassing the "noise reducing " isolated ground at the printer connector, the designer having cleverly put all the parallel output bypasses *inside* an isolated ground. Current has to be put back where it came from or it will go elsewhere.
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