VintageBigBlue.org

 

Re: PemPro question (File uploaded)


Nov 5, 2006

 


----------------------------

#31377 Nov 5, 2006

Hi,

When running the calibration wizard I come to the part where PemPro

asks the user to tell which type of L-shaped configuration the image

looks like. I have a slight problem: even after a 20 second image, I

have only straight vertical lines !

Which configuration should I choose, and does it matter?

Right now, the tool is acquiring data just to see what comes up.

Has anyone experienced this?

Thanks in advance

Regards

Olivier



----------------------------

#31378 Nov 5, 2006

Hi Olivier,



That's most likely because of backlash in DEC. For acquiring data, the

correct direction is not important.



When it comes to programming the mount PEC, it'll become important to

select the correct direction. Then, you may want to bump up the TVC

value, at least while doing the calibration wizard.



If the direction is chosen incorrectly, the PEC programming will

double the mount error. If this happens, all you need to do is

select "Invert Curve" setting, and program the mount again, and it'll

work correctly, so it's not a big deal even if you select the wrong

direction in the calibration wizard.



Regards,



-Paul --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@...> wrote:

>

> Hi,

> When running the calibration wizard I come to the part where PemPro

> asks the user to tell which type of L-shaped configuration the image

> looks like. I have a slight problem: even after a 20 second image, I

> have only straight vertical lines !

> Which configuration should I choose, and does it matter?

> Right now, the tool is acquiring data just to see what comes up.

> Has anyone experienced this?

> Thanks in advance

> Regards

> Olivier

>



----------------------------

#31379 Nov 5, 2006

Hi Paul,

I just finished 6 worm cycle acquisitions and with a 5th order fit,

PemPro predicts .10" and about 7.5" rms.

I programmed the PEC and let it run for another 3 cycles.

An analysis shows +11/-8 peak to peak and 10" rms.

I setup the autoguiding (no calibration issue with 5 sec DEC backlash

compensation), and am now trying a 5' imaging to evaluate the roundness.

Are you saying I should increase TVC even though I have a backlash

compensation with the autoguider?

Regards

Olivier

--- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@...> wrote:

>

> Hi Olivier,

>

> That's most likely because of backlash in DEC. For acquiring data, the

> correct direction is not important.

>

> When it comes to programming the mount PEC, it'll become important to

> select the correct direction. Then, you may want to bump up the TVC

> value, at least while doing the calibration wizard.

>

> If the direction is chosen incorrectly, the PEC programming will

> double the mount error. If this happens, all you need to do is

> select "Invert Curve" setting, and program the mount again, and it'll

> work correctly, so it's not a big deal even if you select the wrong

> direction in the calibration wizard.

>

> Regards,

>

> -Paul

> --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@> wrote:

> >

> > Hi,

> > When running the calibration wizard I come to the part where PemPro

> > asks the user to tell which type of L-shaped configuration the image

> > looks like. I have a slight problem: even after a 20 second image, I

> > have only straight vertical lines !

> > Which configuration should I choose, and does it matter?

> > Right now, the tool is acquiring data just to see what comes up.

> > Has anyone experienced this?

> > Thanks in advance

> > Regards

> > Olivier

> >

>



----------------------------

#31380 Nov 5, 2006

No, don't increase TVC to autoguide, just to do the calibration step

in PEMPro -- it'll help produce the hockey-stick like pattern.



The RMS value sounds very large -- this is the error after the fit

and it is nearly the size of the original error. In average seeing

conditions, my RMS values are between 0.3" and 1.2".



7.5" error indicates the fit is very poor. Was the seeing really

bad? 5th order fit is also usually unnecessary -- first or second

order works best for me.



You may want to post the PemPro data for us to look at. It sounds

like there may be too much non-periodic error that PemPro can't

correct.



Regards,



-Paul



--- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@...>

wrote: >

> Hi Paul,

> I just finished 6 worm cycle acquisitions and with a 5th order fit,

> PemPro predicts .10" and about 7.5" rms.

> I programmed the PEC and let it run for another 3 cycles.

> An analysis shows +11/-8 peak to peak and 10" rms.

> I setup the autoguiding (no calibration issue with 5 sec DEC

backlash > compensation), and am now trying a 5' imaging to evaluate the

roundness. > Are you saying I should increase TVC even though I have a backlash

> compensation with the autoguider?

> Regards

> Olivier

>

> --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@> wrote:

> >

> > Hi Olivier,

> >

> > That's most likely because of backlash in DEC. For acquiring

data, the > > correct direction is not important.

> >

> > When it comes to programming the mount PEC, it'll become

important to > > select the correct direction. Then, you may want to bump up the

TVC > > value, at least while doing the calibration wizard.

> >

> > If the direction is chosen incorrectly, the PEC programming will

> > double the mount error. If this happens, all you need to do is

> > select "Invert Curve" setting, and program the mount again, and

it'll > > work correctly, so it's not a big deal even if you select the

wrong > > direction in the calibration wizard.

> >

> > Regards,

> >

> > -Paul

> > --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@>

wrote: > > >

> > > Hi,

> > > When running the calibration wizard I come to the part where

PemPro > > > asks the user to tell which type of L-shaped configuration the

image > > > looks like. I have a slight problem: even after a 20 second

image, I > > > have only straight vertical lines !

> > > Which configuration should I choose, and does it matter?

> > > Right now, the tool is acquiring data just to see what comes

up. > > > Has anyone experienced this?

> > > Thanks in advance

> > > Regards

> > > Olivier

> > >

> >

>







----------------------------

#31382 Nov 5, 2006

Paul,

I created a GM8 PemPro PEC folder and uploaded two files in it:

- The PemPro log during the 6-cycle data capture

- The PemPro file created by PemPro which I downloaded to the GM8



The first 5-min image looked better than yesterday with resepct to

star roundness. The clouds have come in so no more for today.



Let me know if the data tells you anything useful (or if additional

info is needed)



Regards

Olivier

--- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@...> wrote:

>

> No, don't increase TVC to autoguide, just to do the calibration step

> in PEMPro -- it'll help produce the hockey-stick like pattern.

>

> The RMS value sounds very large -- this is the error after the fit

> and it is nearly the size of the original error. In average seeing

> conditions, my RMS values are between 0.3" and 1.2".

>

> 7.5" error indicates the fit is very poor. Was the seeing really

> bad? 5th order fit is also usually unnecessary -- first or second

> order works best for me.

>

> You may want to post the PemPro data for us to look at. It sounds

> like there may be too much non-periodic error that PemPro can't

> correct.

>

> Regards,

>

> -Paul

>

> --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@>

> wrote:

> >

> > Hi Paul,

> > I just finished 6 worm cycle acquisitions and with a 5th order fit,

> > PemPro predicts .10" and about 7.5" rms.

> > I programmed the PEC and let it run for another 3 cycles.

> > An analysis shows +11/-8 peak to peak and 10" rms.

> > I setup the autoguiding (no calibration issue with 5 sec DEC

> backlash

> > compensation), and am now trying a 5' imaging to evaluate the

> roundness.

> > Are you saying I should increase TVC even though I have a backlash

> > compensation with the autoguider?

> > Regards

> > Olivier

> >

> > --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@> wrote:

> > >

> > > Hi Olivier,

> > >

> > > That's most likely because of backlash in DEC. For acquiring

> data, the

> > > correct direction is not important.

> > >

> > > When it comes to programming the mount PEC, it'll become

> important to

> > > select the correct direction. Then, you may want to bump up the

> TVC

> > > value, at least while doing the calibration wizard.

> > >

> > > If the direction is chosen incorrectly, the PEC programming will

> > > double the mount error. If this happens, all you need to do is

> > > select "Invert Curve" setting, and program the mount again, and

> it'll

> > > work correctly, so it's not a big deal even if you select the

> wrong

> > > direction in the calibration wizard.

> > >

> > > Regards,

> > >

> > > -Paul

> > > --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@>

> wrote:

> > > >

> > > > Hi,

> > > > When running the calibration wizard I come to the part where

> PemPro

> > > > asks the user to tell which type of L-shaped configuration the

> image

> > > > looks like. I have a slight problem: even after a 20 second

> image, I

> > > > have only straight vertical lines !

> > > > Which configuration should I choose, and does it matter?

> > > > Right now, the tool is acquiring data just to see what comes

> up.

> > > > Has anyone experienced this?

> > > > Thanks in advance

> > > > Regards

> > > > Olivier

> > > >

> > >

> >

>



----------------------------

#31383 Nov 5, 2006

Olivier, are you by any chance guiding while acquiring data in

PemPro? You should not be guiding!



There appears to be a really large periodic error in both, X *and*

Y. One of the axis (DEC) should appear to be nearly flat, with only

some random errors due to seeing fluctuations.



If you were not guiding during acquisition, I would suggest you

contact Ray Gralak, authour of PemPro, as the data looks very

strange to me... Here's PemPro support forum link:



ccdware.infopop.cc/eve/forums/a/frm/f/401101098



Regards,



-Paul



--- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@...>

wrote: >

> Paul,

> I created a GM8 PemPro PEC folder and uploaded two files in it:

> - The PemPro log during the 6-cycle data capture

> - The PemPro file created by PemPro which I downloaded to the GM8

>

> The first 5-min image looked better than yesterday with resepct to

> star roundness. The clouds have come in so no more for today.

>

> Let me know if the data tells you anything useful (or if additional

> info is needed)

>

> Regards

> Olivier

>

> --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@> wrote:

> >

> > No, don't increase TVC to autoguide, just to do the calibration

step > > in PEMPro -- it'll help produce the hockey-stick like pattern.

> >

> > The RMS value sounds very large -- this is the error after the

fit > > and it is nearly the size of the original error. In average

seeing > > conditions, my RMS values are between 0.3" and 1.2".

> >

> > 7.5" error indicates the fit is very poor. Was the seeing really

> > bad? 5th order fit is also usually unnecessary -- first or

second > > order works best for me.

> >

> > You may want to post the PemPro data for us to look at. It

sounds > > like there may be too much non-periodic error that PemPro can't

> > correct.

> >

> > Regards,

> >

> > -Paul

> >

> > --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@>

> > wrote:

> > >

> > > Hi Paul,

> > > I just finished 6 worm cycle acquisitions and with a 5th order

fit, > > > PemPro predicts .10" and about 7.5" rms.

> > > I programmed the PEC and let it run for another 3 cycles.

> > > An analysis shows +11/-8 peak to peak and 10" rms.

> > > I setup the autoguiding (no calibration issue with 5 sec DEC

> > backlash

> > > compensation), and am now trying a 5' imaging to evaluate the

> > roundness.

> > > Are you saying I should increase TVC even though I have a

backlash > > > compensation with the autoguider?

> > > Regards

> > > Olivier

> > >

> > > --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@>

wrote: > > > >

> > > > Hi Olivier,

> > > >

> > > > That's most likely because of backlash in DEC. For acquiring

> > data, the

> > > > correct direction is not important.

> > > >

> > > > When it comes to programming the mount PEC, it'll become

> > important to

> > > > select the correct direction. Then, you may want to bump up

the > > TVC

> > > > value, at least while doing the calibration wizard.

> > > >

> > > > If the direction is chosen incorrectly, the PEC programming

will > > > > double the mount error. If this happens, all you need to do

is > > > > select "Invert Curve" setting, and program the mount again,

and > > it'll

> > > > work correctly, so it's not a big deal even if you select

the > > wrong

> > > > direction in the calibration wizard.

> > > >

> > > > Regards,

> > > >

> > > > -Paul

> > > > --- In Losmandy_users@yahoogroups.com, "olivierfp"

oprache@> > > wrote:

> > > > >

> > > > > Hi,

> > > > > When running the calibration wizard I come to the part

where > > PemPro

> > > > > asks the user to tell which type of L-shaped configuration

the > > image

> > > > > looks like. I have a slight problem: even after a 20

second > > image, I

> > > > > have only straight vertical lines !

> > > > > Which configuration should I choose, and does it matter?

> > > > > Right now, the tool is acquiring data just to see what

comes > > up.

> > > > > Has anyone experienced this?

> > > > > Thanks in advance

> > > > > Regards

> > > > > Olivier

> > > > >

> > > >

> > >

> >

>







----------------------------

#31384 Nov 5, 2006

Paul,

No I was not guiding during the acquisistion

I will contact Ray as you suggested. I must be doing something wrong

somewhere

Thanks for your help

Regards

Olivier --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@...> wrote:

>

> Olivier, are you by any chance guiding while acquiring data in

> PemPro? You should not be guiding!

>

> There appears to be a really large periodic error in both, X *and*

> Y. One of the axis (DEC) should appear to be nearly flat, with only

> some random errors due to seeing fluctuations.

>

> If you were not guiding during acquisition, I would suggest you

> contact Ray Gralak, authour of PemPro, as the data looks very

> strange to me... Here's PemPro support forum link:

>

> ccdware.infopop.cc/eve/forums/a/frm/f/401101098

>

> Regards,

>

> -Paul

>

> --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@>

> wrote:

> >

> > Paul,

> > I created a GM8 PemPro PEC folder and uploaded two files in it:

> > - The PemPro log during the 6-cycle data capture

> > - The PemPro file created by PemPro which I downloaded to the GM8

> >

> > The first 5-min image looked better than yesterday with resepct to

> > star roundness. The clouds have come in so no more for today.

> >

> > Let me know if the data tells you anything useful (or if additional

> > info is needed)

> >

> > Regards

> > Olivier

> >

> > --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@> wrote:

> > >

> > > No, don't increase TVC to autoguide, just to do the calibration

> step

> > > in PEMPro -- it'll help produce the hockey-stick like pattern.

> > >

> > > The RMS value sounds very large -- this is the error after the

> fit

> > > and it is nearly the size of the original error. In average

> seeing

> > > conditions, my RMS values are between 0.3" and 1.2".

> > >

> > > 7.5" error indicates the fit is very poor. Was the seeing really

> > > bad? 5th order fit is also usually unnecessary -- first or

> second

> > > order works best for me.

> > >

> > > You may want to post the PemPro data for us to look at. It

> sounds

> > > like there may be too much non-periodic error that PemPro can't

> > > correct.

> > >

> > > Regards,

> > >

> > > -Paul

> > >

> > > --- In Losmandy_users@yahoogroups.com, "olivierfp" oprache@>

> > > wrote:

> > > >

> > > > Hi Paul,

> > > > I just finished 6 worm cycle acquisitions and with a 5th order

> fit,

> > > > PemPro predicts .10" and about 7.5" rms.

> > > > I programmed the PEC and let it run for another 3 cycles.

> > > > An analysis shows +11/-8 peak to peak and 10" rms.

> > > > I setup the autoguiding (no calibration issue with 5 sec DEC

> > > backlash

> > > > compensation), and am now trying a 5' imaging to evaluate the

> > > roundness.

> > > > Are you saying I should increase TVC even though I have a

> backlash

> > > > compensation with the autoguider?

> > > > Regards

> > > > Olivier

> > > >

> > > > --- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@>

> wrote:

> > > > >

> > > > > Hi Olivier,

> > > > >

> > > > > That's most likely because of backlash in DEC. For acquiring

> > > data, the

> > > > > correct direction is not important.

> > > > >

> > > > > When it comes to programming the mount PEC, it'll become

> > > important to

> > > > > select the correct direction. Then, you may want to bump up

> the

> > > TVC

> > > > > value, at least while doing the calibration wizard.

> > > > >

> > > > > If the direction is chosen incorrectly, the PEC programming

> will

> > > > > double the mount error. If this happens, all you need to do

> is

> > > > > select "Invert Curve" setting, and program the mount again,

> and

> > > it'll

> > > > > work correctly, so it's not a big deal even if you select

> the

> > > wrong

> > > > > direction in the calibration wizard.

> > > > >

> > > > > Regards,

> > > > >

> > > > > -Paul

> > > > > --- In Losmandy_users@yahoogroups.com, "olivierfp"

> oprache@>

> > > wrote:

> > > > > >

> > > > > > Hi,

> > > > > > When running the calibration wizard I come to the part

> where

> > > PemPro

> > > > > > asks the user to tell which type of L-shaped configuration

> the

> > > image

> > > > > > looks like. I have a slight problem: even after a 20

> second

> > > image, I

> > > > > > have only straight vertical lines !

> > > > > > Which configuration should I choose, and does it matter?

> > > > > > Right now, the tool is acquiring data just to see what

> comes

> > > up.

> > > > > > Has anyone experienced this?

> > > > > > Thanks in advance

> > > > > > Regards

> > > > > > Olivier

> > > > > >

> > > > >

> > > >

> > >

> >

>







----------------------------

#31385 Nov 5, 2006

Hi Olivier,



Someone alerted me to your post and I have downloaded and looked at your data.

First, are you sure that you ran the calibration wizard before collecting data?



I ask because the camera rotation angle is set to about -30 degrees. If I turn

off rotation it is clear that the X-axis is declination.



After doing that I was able to analyze your log file and I see that it has a

fundamental at about 3.2 (about the same as the G-11). Recently this has been

traced to the alignment of the worm block and the ball bearings that rotate in a

sleeve found in the G-11. I'm not sure however if the same design applies to the

G8. However, you must solve that issue (the 3.2x fundamental) first if you are

going to get good periodic error reduction.



-Ray

> -----Original Message-----

> From: Losmandy_users@yahoogroups.com

> [mailto:Losmandy_users@yahoogroups.com] On Behalf Of olivierfp

> Sent: Sunday, November 05, 2006 6:47 PM

> To: Losmandy_users@yahoogroups.com

> Subject: [Losmandy_users] Re: PemPro question (File uploaded)

>

> Paul,

> No I was not guiding during the acquisistion

> I will contact Ray as you suggested. I must be doing something wrong

> somewhere

> Thanks for your help

> Regards

> Olivier

> --- In Losmandy_users@yahoogroups.com

> mailto:Losmandy_users%40yahoogroups.com> , "Paul K"

> pkane2001@...> wrote:

> >

> > Olivier, are you by any chance guiding while acquiring data in

> > PemPro? You should not be guiding!

> >

> > There appears to be a really large periodic error in both, X *and*

> > Y. One of the axis (DEC) should appear to be nearly flat, with only

> > some random errors due to seeing fluctuations.

> >

> > If you were not guiding during acquisition, I would suggest you

> > contact Ray Gralak, authour of PemPro, as the data looks very

> > strange to me... Here's PemPro support forum link:

> >

> > ccdware.infopop.cc/eve/forums/a/frm/f/401101098

> ccdware.infopop.cc/eve/forums/a/frm/f/401101098>

> >

> > Regards,

> >

> > -Paul

> >

> > --- In Losmandy_users@yahoogroups.com

> mailto:Losmandy_users%40yahoogroups.com> , "olivierfp" oprache@>

> > wrote:

> > >

> > > Paul,

> > > I created a GM8 PemPro PEC folder and uploaded two files in it:

> > > - The PemPro log during the 6-cycle data capture

> > > - The PemPro file created by PemPro which I downloaded to the GM8

> > >

> > > The first 5-min image looked better than yesterday with resepct to

> > > star roundness. The clouds have come in so no more for today.

> > >

> > > Let me know if the data tells you anything useful (or if

> additional

> > > info is needed)

> > >

> > > Regards

> > > Olivier

> > >

> > > --- In Losmandy_users@yahoogroups.com

> mailto:Losmandy_users%40yahoogroups.com> , "Paul K"

> pkane2001@> wrote:

> > > >

> > > > No, don't increase TVC to autoguide, just to do the calibration

> > step

> > > > in PEMPro -- it'll help produce the hockey-stick like pattern.

> > > >

> > > > The RMS value sounds very large -- this is the error after the

> > fit

> > > > and it is nearly the size of the original error. In average

> > seeing

> > > > conditions, my RMS values are between 0.3" and 1.2".

> > > >

> > > > 7.5" error indicates the fit is very poor. Was the

> seeing really

> > > > bad? 5th order fit is also usually unnecessary -- first or

> > second

> > > > order works best for me.

> > > >

> > > > You may want to post the PemPro data for us to look at. It

> > sounds

> > > > like there may be too much non-periodic error that PemPro can't

> > > > correct.

> > > >

> > > > Regards,

> > > >

> > > > -Paul

> > > >

> > > > --- In Losmandy_users@yahoogroups.com

> mailto:Losmandy_users%40yahoogroups.com> , "olivierfp" oprache@>

> > > > wrote:

> > > > >

> > > > > Hi Paul,

> > > > > I just finished 6 worm cycle acquisitions and with a

> 5th order

> > fit,

> > > > > PemPro predicts .10" and about 7.5" rms.

> > > > > I programmed the PEC and let it run for another 3 cycles.

> > > > > An analysis shows +11/-8 peak to peak and 10" rms.

> > > > > I setup the autoguiding (no calibration issue with 5 sec DEC

> > > > backlash

> > > > > compensation), and am now trying a 5' imaging to evaluate the

> > > > roundness.

> > > > > Are you saying I should increase TVC even though I have a

> > backlash

> > > > > compensation with the autoguider?

> > > > > Regards

> > > > > Olivier

> > > > >

> > > > > --- In Losmandy_users@yahoogroups.com

> mailto:Losmandy_users%40yahoogroups.com> , "Paul K" pkane2001@>

> > wrote:

> > > > > >

> > > > > > Hi Olivier,

> > > > > >

> > > > > > That's most likely because of backlash in DEC. For

> acquiring

> > > > data, the

> > > > > > correct direction is not important.

> > > > > >

> > > > > > When it comes to programming the mount PEC, it'll become

> > > > important to

> > > > > > select the correct direction. Then, you may want to bump up

> > the

> > > > TVC

> > > > > > value, at least while doing the calibration wizard.

> > > > > >

> > > > > > If the direction is chosen incorrectly, the PEC programming

> > will

> > > > > > double the mount error. If this happens, all you need to do

> > is

> > > > > > select "Invert Curve" setting, and program the mount again,

> > and

> > > > it'll

> > > > > > work correctly, so it's not a big deal even if you select

> > the

> > > > wrong

> > > > > > direction in the calibration wizard.

> > > > > >

> > > > > > Regards,

> > > > > >

> > > > > > -Paul

> > > > > > --- In Losmandy_users@yahoogroups.com

> mailto:Losmandy_users%40yahoogroups.com> , "olivierfp"

> > oprache@>

> > > > wrote:

> > > > > > >

> > > > > > > Hi,

> > > > > > > When running the calibration wizard I come to the part

> > where

> > > > PemPro

> > > > > > > asks the user to tell which type of L-shaped

> configuration

> > the

> > > > image

> > > > > > > looks like. I have a slight problem: even after a 20

> > second

> > > > image, I

> > > > > > > have only straight vertical lines !

> > > > > > > Which configuration should I choose, and does it matter?

> > > > > > > Right now, the tool is acquiring data just to see what

> > comes

> > > > up.

> > > > > > > Has anyone experienced this?

> > > > > > > Thanks in advance

> > > > > > > Regards

> > > > > > > Olivier

> > > > > > >

> > > > > >

> > > > >

> > > >

> > >

> >

>

>

>

>

>







----------------------------

#31389 Nov 6, 2006

Yes, the 3.15 fundamental does also apply to the GM-8. However, since the RA gear has

180 teeth its frequency is about 152 sec. Both designs use the same worm/bearing block

assembly.





sorry to butt-in.



Tim Walkowski

--- In Losmandy_users@yahoogroups.com, "Ray Gralak" rgr@...> wrote:

>

> Hi Olivier,

>

> Someone alerted me to your post and I have downloaded and looked at your data.

> First, are you sure that you ran the calibration wizard before collecting data?

>

> I ask because the camera rotation angle is set to about -30 degrees. If I turn

> off rotation it is clear that the X-axis is declination.

>

> After doing that I was able to analyze your log file and I see that it has a

> fundamental at about 3.2 (about the same as the G-11). Recently this has been

> traced to the alignment of the worm block and the ball bearings that rotate in a

> sleeve found in the G-11. I'm not sure however if the same design applies to the

> G8. However, you must solve that issue (the 3.2x fundamental) first if you are

> going to get good periodic error reduction.

>

> -Ray

>

> > -----Original Message-----

> > From: Losmandy_users@yahoogroups.com

> > [mailto:Losmandy_users@yahoogroups.com] On Behalf Of olivierfp

> > Sent: Sunday, November 05, 2006 6:47 PM

> > To: Losmandy_users@yahoogroups.com

> > Subject: [Losmandy_users] Re: PemPro question (File uploaded)

> >

> > Paul,

> > No I was not guiding during the acquisistion

> > I will contact Ray as you suggested. I must be doing something wrong

> > somewhere

> > Thanks for your help

> > Regards

> > Olivier

> > --- In Losmandy_users@yahoogroups.com

> > mailto:Losmandy_users%40yahoogroups.com> , "Paul K"

> > pkane2001@> wrote:

> > >

> > > Olivier, are you by any chance guiding while acquiring data in

> > > PemPro? You should not be guiding!

> > >

> > > There appears to be a really large periodic error in both, X *and*

> > > Y. One of the axis (DEC) should appear to be nearly flat, with only

> > > some random errors due to seeing fluctuations.

> > >

> > > If you were not guiding during acquisition, I would suggest you

> > > contact Ray Gralak, authour of PemPro, as the data looks very

> > > strange to me... Here's PemPro support forum link:

> > >

> > > ccdware.infopop.cc/eve/forums/a/frm/f/401101098

> > ccdware.infopop.cc/eve/forums/a/frm/f/401101098>

> > >

> > > Regards,

> > >

> > > -Paul

> > >

> > > --- In Losmandy_users@yahoogroups.com

> > mailto:Losmandy_users%40yahoogroups.com> , "olivierfp" oprache@>

> > > wrote:

> > > >

> > > > Paul,

> > > > I created a GM8 PemPro PEC folder and uploaded two files in it:

> > > > - The PemPro log during the 6-cycle data capture

> > > > - The PemPro file created by PemPro which I downloaded to the GM8

> > > >

> > > > The first 5-min image looked better than yesterday with resepct to

> > > > star roundness. The clouds have come in so no more for today.

> > > >

> > > > Let me know if the data tells you anything useful (or if

> > additional

> > > > info is needed)

> > > >

> > > > Regards

> > > > Olivier

> > > >

> > > > --- In Losmandy_users@yahoogroups.com

> > mailto:Losmandy_users%40yahoogroups.com> , "Paul K"

> > pkane2001@> wrote:

> > > > >

> > > > > No, don't increase TVC to autoguide, just to do the calibration

> > > step

> > > > > in PEMPro -- it'll help produce the hockey-stick like pattern.

> > > > >

> > > > > The RMS value sounds very large -- this is the error after the

> > > fit

> > > > > and it is nearly the size of the original error. In average

> > > seeing

> > > > > conditions, my RMS values are between 0.3" and 1.2".

> > > > >

> > > > > 7.5" error indicates the fit is very poor. Was the

> > seeing really

> > > > > bad? 5th order fit is also usually unnecessary -- first or

> > > second

> > > > > order works best for me.

> > > > >

> > > > > You may want to post the PemPro data for us to look at. It

> > > sounds

> > > > > like there may be too much non-periodic error that PemPro can't

> > > > > correct.

> > > > >

> > > > > Regards,

> > > > >

> > > > > -Paul

> > > > >

> > > > > --- In Losmandy_users@yahoogroups.com

> > mailto:Losmandy_users%40yahoogroups.com> , "olivierfp" oprache@>

> > > > > wrote:

> > > > > >

> > > > > > Hi Paul,

> > > > > > I just finished 6 worm cycle acquisitions and with a

> > 5th order

> > > fit,

> > > > > > PemPro predicts .10" and about 7.5" rms.

> > > > > > I programmed the PEC and let it run for another 3 cycles.

> > > > > > An analysis shows +11/-8 peak to peak and 10" rms.

> > > > > > I setup the autoguiding (no calibration issue with 5 sec DEC

> > > > > backlash

> > > > > > compensation), and am now trying a 5' imaging to evaluate the

> > > > > roundness.

> > > > > > Are you saying I should increase TVC even though I have a

> > > backlash

> > > > > > compensation with the autoguider?

> > > > > > Regards

> > > > > > Olivier

> > > > > >

> > > > > > --- In Losmandy_users@yahoogroups.com

> > mailto:Losmandy_users%40yahoogroups.com> , "Paul K" pkane2001@>

> > > wrote:

> > > > > > >

> > > > > > > Hi Olivier,

> > > > > > >

> > > > > > > That's most likely because of backlash in DEC. For

> > acquiring

> > > > > data, the

> > > > > > > correct direction is not important.

> > > > > > >

> > > > > > > When it comes to programming the mount PEC, it'll become

> > > > > important to

> > > > > > > select the correct direction. Then, you may want to bump up

> > > the

> > > > > TVC

> > > > > > > value, at least while doing the calibration wizard.

> > > > > > >

> > > > > > > If the direction is chosen incorrectly, the PEC programming

> > > will

> > > > > > > double the mount error. If this happens, all you need to do

> > > is

> > > > > > > select "Invert Curve" setting, and program the mount again,

> > > and

> > > > > it'll

> > > > > > > work correctly, so it's not a big deal even if you select

> > > the

> > > > > wrong

> > > > > > > direction in the calibration wizard.

> > > > > > >

> > > > > > > Regards,

> > > > > > >

> > > > > > > -Paul

> > > > > > > --- In Losmandy_users@yahoogroups.com

> > mailto:Losmandy_users%40yahoogroups.com> , "olivierfp"

> > > oprache@>

> > > > > wrote:

> > > > > > > >

> > > > > > > > Hi,

> > > > > > > > When running the calibration wizard I come to the part

> > > where

> > > > > PemPro

> > > > > > > > asks the user to tell which type of L-shaped

> > configuration

> > > the

> > > > > image

> > > > > > > > looks like. I have a slight problem: even after a 20

> > > second

> > > > > image, I

> > > > > > > > have only straight vertical lines !

> > > > > > > > Which configuration should I choose, and does it matter?

> > > > > > > > Right now, the tool is acquiring data just to see what

> > > comes

> > > > > up.

> > > > > > > > Has anyone experienced this?

> > > > > > > > Thanks in advance

> > > > > > > > Regards

> > > > > > > > Olivier

> > > > > > > >

> > > > > > >

> > > > > >

> > > > >

> > > >

> > >

> >

> >

> >

> >

> >

>







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