So I just (today) took my 79 300SD in to my local indy for my annual smog test (required in Nevada every year for vehicles under 10,000 pounds and newer than 1968).

I passed smog with 3.1% opacity (30% is allowed).

But here's what I need help with:

Part of the test was this "dynamometer" thing. I was just wondering what the numbers mean, as there were only two listed, and (as I know nothing of dynamometers) I would appreciate someone who could interpret them for me as to what they mean as well as whether they are good/bad/average/normal/OK etc.

Here they are:
Dynamometer Speed: 4000
Dynamometer Horsepower: 150

Any help with interpretation would be much appreciated.

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'79 300SD
'82 Chevy Chevette diesel