Measure Periodic Error - free software available??

Is there free software available that can measure Periodic Error?

Cheers,

Michael, its easy enough to do with most autoguiding software which can write the errors to a log file. Guidemaster does this. You can then bring the data into something like excel or openoffice and graph it.

Thanks Dave. I'll give this a try.

Took another look at Maxim DL.
Appears you can save the guide corrections fairly easily to a log file.
Data can then be imported into Excel.
Must give this a go on the next clear night.

Cheers,

Another possibility is PEMPro and which is available for a demo/trial period. It is REALLY good! Checkout the CCDWare website.