PHD Graph test with the EM-200 mount.
PHD Graph test with the EM-200 mount, FSQ106ED and QHY5II-L autoguider (3.75 micron pixels).
Camera exposure duration: 2.0 seconds.
Total period: 200 seconds.
Graph Scale 1.46 arcsec/pixel.
Maximum RA and Dec. error: +/- 0.87 arcsec.
RA RMS error: 0.36 arcsec. (0.25 pixel)
Total (RA and Dec.) RMS error: 0.5 arcsec.
Obs: Done from my apartment balcony; street car traffic disturbed the measurements.