Test points on resistor divider riddle

[gashtaan]

I'm reverse engineering Archimede frequency inverter and I found out something weird. There are 3 test points (TP6, TP8 and TP9) connected to different junctions of the resistor divider, and both ends of this resistor divider are connected to 3.3V rail. Any clue what could be the purpose? What could they test/measure in such circuit?

[squadchannel]

I suppose they're checking the accuracy of the resistors used in this board(lot).

ah, I thought it was a voltage divider, but both ends are at 3.3V.

[gashtaan]

ah, I thought it was a voltage divider, but both ends are at 3.3V.

Maybe they pull some test point(s) down to GND and measure voltages on others, but I can't see any reason for it.

[Doctorandus_P]

Maybe something more is connected to them on the bottom of the PCB. Such resistors (and in different values) can also be used by automated test equipment to identify different versions or revisions of a product on a test bed. Resistors are very cheap.

[gashtaan]

Maybe something more is connected to them on the bottom of the PCB. Such resistors (and in different values) can also be used by automated test equipment to identify different versions or revisions of a product on a test bed. Resistors are very cheap.

There are no vias to different PCB layers. Yes, I also think that it's used to identify specific version on the test bed, but seems a bit overcomplex to do it by 5-resistor divider connected to power rail like this. I'm just curious if anyone has seen or used anything similar.

[bostonman]

It could have blind vias and/or buried vias.