PHD2 Calibration: Guide Rate warning

[Ishan Mair]

After calibration, I get a message saying RA & Declination rate much different from expected rate. Have a look at this screen-shot.

Calibration has always baffled me. If I set Calibration steps to 12 then it does about 7 or 8 steps when it calibrates. Thanks for your help.

[Starlight 1]

How was your balancing ?  I have this Monday night  and I forgot to do balancing when setting up .

[PhotoGav]

Have you put in the correct details for your set up in The Brain? If it's set to something different the results that your scope etc combo provides don't make sense to what it was expecting and computer says "no"...!

[glowingturnip]

looks like the mount moved twice as fast in each direction as it did last time ?  14 a-s/sec instead of 7.5 a-s/sec.  Did you change your guide speed in the mount to 1x instead of 0.5x for example ?

Anyway, won't matter, your RA and Dec guiding speeds are almost identical to each other, and looks nicely orthogonal, so you should get good guiding from this.

PHD nowadays can be a bit naggy about stuff that doesn't really matter, most of those type of warnings are ignorable.

[libraryman]

Looks good to me, the expected rate is dead on for 0.5x guide rate.

Ray

[Ishan Mair]

Thanks for helping everyone. I have set the pulse guide rate to 0.5x in both axes. I think I have input correct values in the "Brain". Balancing was off as I recall. But this has happened often.

[Owmuchonomy]

My understanding is that it is best to aim for at least 15 steps in each axis during calibration, a parameter controlled by the calibration duration in milliseconds.  This differs depending upon the position in the sky you have chosen to image. So some experimentation is required.