Dixon, who gave evidence on Tuesday and Wednesday on issues including fibres, wood splinters, the sound of a gun versus a cricket bat hitting a door, and how a bullet could ricochet off tiles, said as an expert he "only looked at the evidence".
"In my experience in the police, I feel I can interpret," he said.
Prosecutor Gerrie Nel queried Dixon's qualifications and background, before asking specifically what type of expert Dixon, a qualified geologist, was.
"Are you a sound expert?" Nel asked.
"I would hope I'm a sound expert," he replied.
Acoustics
Nel repeated the question, referring to sound and acoustics specifically, to which Dixon said the test he did of the sound made by a cricket bat hitting a door and a gun firing was to determine whether the two could be confused.
"[The] expertise used was attempting to reconstruct the situation... I was not listening to myself making that sound," he said.
Nel asked who was involved in the sound test at a firing range. Dixon said the range officer, two ballistic experts, their wives, two people from the sound recording company, and himself.
"I think that's almost all."
After further probing on who was at the range, Dixon said the range was closed.
"I was concentrating on the test. I can't recall anyone there."
Darkness
Nel moved onto the test Dixon conducted on how dark it would have been in Pistorius's bedroom on 14 February last year, when his girlfriend Reeva Steenkamp was shot dead.
Dixon said: "The instruments that I used were my eyes."
Following further questioning from Nel he said he was not a light measuring expert, and had not used equipment to conduct the test.
Pistorius, who appeared to pay rapt attention to Nel's cross-examination of Dixon, is on trial for shooting Steenkamp through the locked door of a toilet cubicle in his Pretoria house.
Bullet casing
The bullet casing found in the toilet bowl next to a fatally wounded Steekamp could not have been from the one that hit her in the head, the court heard earlier.
Dixon said the weight of the bullet casing did not add up, testifying that the Black Talon bullet which hit Steenkamp weighed around 127 grains.
The one found in the toilet weighed 65.9 grains. One grain is about 0.06 grams. Dixon explained that adding this to that of the projectile found in Steenkamp's skull, the numbers did not add up, meaning it could not have been the same bullet.
He agreed with the testimony of a police official who earlier told the court that the first shot Pistorius fired probably struck Steenkamp's hip.
As Dixon spoke about the wounds on Steenkamp's body, Pistorius leaned forward and held his head in his hands. His sister, Aimee, who sat in the court gallery, was also visibly upset.
Pistorius is on trial for the murder of Steenkamp. He shot her dead through the locked toilet door of his home on Valentine's Day last year, apparently thinking she was an intruder.
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