We've developed one that works well for us. R1 is mounted on the cabinet or
chassis. R101 is on the first subassembly (generally a pcb), R201 on the
second subassembly, and so on. I've been asked what happens when you get
past the 9th subassembly and I reply that we are building small aircraft
electronic devices, not locomotives.

Jim

Formal military systems often used nested designators: A3A6R41
uniquely located a resistor in a radar system. Some of the older HP
schematics used this convention, too.


John