To use K3 to measure your pe, go into Option> Telescope and CCD settings; input your telescope aperture and FL and your CCD details (ToUcam: 5.6x5.6 micron pixels) and then save the settings. You will get your resolution per pixel at the bottom as well as the FOV for the chip.
Once saved close that box, slew to a star and center it. Make sure that you camera is "square" to the imaging train. By that I mean when you press the RA buttons on your controller the star moves left and right on the screen and not up and down. If it does go up and down rotate your camera 90 deg. To avoid going through the process of measuring your camera angle try to get the camera as close to square as you can. To help with this I'd suggest clicking on the reticle icon on the tool bar.
Once you are square, start the drift explorer, roughly center your star, click on the target icon on drift explore and then click on your star. Your dec error and RA motion will start to appear on the graph. You can log this to open later and graph in Excel if you want to. I'd suggest just watching it for a while to get some idea. The numbers down the side are pixels and the numbers across the bottom are sec.
If you want to recenter the graph, click on the second icon from the left in the drift explorer tool bar. Under the tool bar you will see various readings for RA and DEC. I tend to ignore the RA ones and concentrate on the DEC. The figure immediately under "DEC" will give you your drift in arcsec/min.
To manually work out your RA error watch for the max and min readings for a full gear rotation and then multiply them by your pixel resolution (under options> telescope and ccd ...).
Hope you can follow that. If not let me know
