I have wanted a rotary compression tester for ten years.
Without realizing I had one sitting in my hanger
disguised as a Heath Kit strip chart recorder.
The paper runs at selected constant speeds while the
pen responds to 10 volts peak to peak. All I need now is a
30 dollar Free Scale pressure sensor like the one
Tracy uses in his EFI computer. Puts out 0 to 5 volts
from 0 to 30 psi. The paper drive motor is not
working but it looks simple to fix with all that
30 year old tech. The pen servo works great.
I found it when I was looking for the Aussi
CD system.

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Here is a used one for $150 bucks.

http://www.techbrokers.com/Techbrokers_Catalog_1Page36.html

And one for $225.

http://www.pemed.com/lab/labelectronics/labelectronics.htm

Here is a company that does the same thing with your computer
for as low as $25. RS232 so you need a RS232 to USB converter
for x amount more.

http://www.dataq.com/c_cr/?source=googlecr&gclid=CLDVjcPwy5kCFUFM5Qodrmm_uQ


Paul Lamar

I know it was mentioned before that the fluke psv-350 might not  present
an accurate representation of compression when used with a digital voltmeter.
I have used pen chart recorders in the past, and they aren't known for
their HF response. Modern digital signal recorders are not included
in this assesment. Check all numbers before low cost test equipment
is used for analysis.
C. Smith

I think the strip chart recorder is probably fast enough for the starter
turning the engine over.

Paul Lamar