Regulator test rig you don't need to suck.

[Open Ocean Diver]

I mean instead of the drip valve....

You mean the vent?

 

[rhwestfall]

You mean the vent?

Yes (from the schematic by @rsingler it is to reduce the vacuum volume "intensity", and is an adjustable valve)

 

[Open Ocean Diver]

Yes (from the schematic by @rsingler it is to reduce the vacuum volume "intensity", and is an adjustable valve)

I use a length (3 feet) of tubing teed from the pump output. One side goes to the mouthpiece the other is coiled up with the end open. Works perfect.

 

[rhwestfall]

Input, not output, we are talking vacuum.... (sorry, it is the engineer in me)

 

[JohnN]

I'm not sure yet about better adjustment but it certainly enables better accuracy. For example I am able to discriminate between two identical Aqualung legend 2nd stages, one measures 7/8" wg and one measures 1" wg. That's 1/8" difference which is 1/16" on each side of the manometer.

I checked all my regs after I finished the test rig and all are within manufacturer's specification so I haven't actually done any adjustments

Do think you could tell the difference in how they breath in a blind test?

Measure with a micrometer, mark with chalk, cut with an axe, hammer to fit

 

[Open Ocean Diver]

Input, not output, we are talking vacuum.... (sorry, it is the engineer in me)

Fine be that way... yes input. Lol

 

[Open Ocean Diver]

Do think you could tell the difference in how they breath in a blind test?

Measure with a micrometer, mark with chalk, cut with an axe, hammer to fit

With a good set of lungs you could.

 

[rsingler]

I used this drip adjustable irrigation sprinkler head. Home Depot. It's basically a plastic needle valve.

 

[grf88]

Input, not output, we are talking vacuum.... (sorry, it is the engineer in me)

Not so sure:
Dictionaryout·put
/ˈoutˌpo͝ot/
Learn to pronounce
See definitions in:
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noun

1. 1.
   the amount of something produced by a person, machine, or industry.
   "efficiency can lead to higher outputs"

 

[Open Ocean Diver]

Not so sure:
Dictionaryout·put
/ˈoutˌpo͝ot/
Learn to pronounce
See definitions in:
All
Economics
Technology
noun

1. 1.
   the amount of something produced by a person, machine, or industry.
   "efficiency can lead to higher outputs"

If you look at the pump as a machine it’s the input. When you inhale your inputing not outputting. Lol