Firstly, I'll answer my own question by saying that I don't think I have broken it.
However, is it possible I could have? (and also possibly, the power supply I was testing).
I am quite new to electronics and recently purchased a Fluke 115. Having watched a few YouTube videos and looking through its manual, I decided to measure Voltage (V) and Current (A) between a DC power supply and a Mini-ITX motherboard.
So, I Connected the black lead to the common terminal, and the red lead to the V terminal. Stuck the ends of the probes on the outside and inside of the barrel jack. Set it to Volts DC. Measuring voltage fine with normal/reverse polarity. (+/-).
Now I went to try and measure current... sigh...
Using a lead I made with a Mini-fit JR connector on one end, and a soldered DC jack on the other, I snipped the positive wire so I could break the circuit and put the probes in-line. I fitted some crocodile clip accessories from Fluke to the probes, set it to Amps DC and tried measuring. I was getting a zero reading, so I must have done something wrong?
Stupidly, I thought, hmm... I will just double check the meter is still working and tried to measure volts again. Took the croc-clips off, stuck the probes in the jack and pop/flash, a spark appeared. Pulled away quickly.
I had left the red lead in the A terminal :(
Here is why I don't think I've broken it (or the power supply):
Firstly, I did a fuse check by connecting one probe to the V terminal, and putting its probe into the A terminal. Setting it to Ohms, it gave me a reading of 0.1/0.2 Ohms. So the fuse doesn't appear to be blown.
After actually connecting the probes in the correct way, I am getting the correct Voltage still.
Also I figured out why the current wasn't working, and I'm now getting an acceptable reading of Amps.
Some additional info:
The power supply outputs 19V, and can supply up to 6.32A.
Inspecting my probes, and the black probe where the spark came from has a tiny little dark patch (very very small).
I normally wouldn't care, but the meter was expensive with it being a Fluke, but I wanted something accurate. I also don't take chances with anything electrical due to possible shock/fire risks.
Then again, I realise I am an idiot for quickly rushing ahead and measuring things.
But, do you think I've broken anything?