Understanding the resistance readings between PCB connectors

Question

Based on a question I asked earlier today, I am trying to verify that there's not short caused by my bad soldering.

Luckily I had bought two of these modules. To make a baseline, I started looking at the module that I had not done anything to.

Using this Multimeter (on a disconnected module -- it has no solder and no wires in/out), I am pressing the black lead again the MOSI pin (see diagram below) and moving the red lead one pin down, one pin at a time.

However, I am not entirely sure what I am looking at, for example:

With black on MISO and red on MOSI, or SCK, the reading is 350+K Ohms.

With the black on MISO and read on RESET, the reading is 150+K Ohms.

With black on MISO and red on DIO5, the reading is 1.05K Ohms and red on GND shows 0.5K Ohms.

When I compare that with this video for example, his reading stays at 1 across pin changes.

Again, this is an untouched board, direct from the seller. So is my understanding not correct (i.e. the readings are fine and I don't know what they mean)? Or is it a bad module?

Answer 1

None of these are shorted, which is what you read when the DMM leads are connected to each other.

With black on MISO and red on MOSI, or SCK, the reading is 350+K Ohms.

MOSI and CLK are both high R inputs as displayed

With the black on MISO and read on RESET, the reading is 150+K Ohms.

Reset is high R input as displayed

With black on MISO and red on DIO5, the reading is 1.05K Ohms

Both are low R outputs but not active? probably diode resistance

and red on GND shows 0.5K Ohms.

Same as above

Unless you wore a gnded ESD strap, they were not untouched

Answer 2

It's most likely fine. These kind of numbers are typical when there are components on the board. You might want to trace through and see what that 500R reading is - perhaps a resistor on the board. A short from bad soldering is generally pretty close to zero ohms.