em-10 sideral rate too fast

Hi,
I am trying to measure a EM10 PE and the sideral rate seems too fast. I am not using a non regulated 12V. I have measured its output voltage without any load as 14V. I will try a regulated power supply. Can the problem be the power supply ?

Thanks,
Andre

Andre, it could very well be your problem...
Let us know how it goes once you try a regulated PS...

>>Can the problem be the power supply >>

I have tested EM 10 mounts here and find them to be very accurate in drive rate. The voltage supply will make no difference in the rate. It is always nice to have a stable voltage supply with no spikes or line noise.

In most cases of perceived wrong drive rate, it turned out to be simply a polar alignment problem. The star will drift east or west depending on whether the polar axis is set too high or too low in altitude. Short of doing a classic drift alignment, try raising the polar axis if the rate seems too fast, or lowering it if it seems too slow. In some cases I found that people were quite surprised that it was not a tracking problem, but a simple polar alignment problem.

Rolando