Re: [time-nuts] Rpair of an 8662 HP Generator

[Rob Sherwood .]

With the improvement in the top radios today, it is no longer possible to test 
them with my 8662A / 8663A generators.  I have had to move to 8642A / 8642B. 
However for more general sig gen needs, I prefer the 8662A.

Rob
NC0B

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--- via 
time-nuts
Sent: Friday, April 15, 2016 7:26 PM
To: paulsw...@gmail.com; time-nuts@febo.com
Subject: Re: [time-nuts] Rpair of an 8662 HP Generator



Thanks, I do not have a repair manual and I hate to abandon the signal 
generator after man years of positive use... Ulrich  
 
 
In a message dated 4/15/2016 9:14:21 P.M. Eastern Daylight Time,  
paulsw...@gmail.com writes:

 
Ulrich
To  your first question I am unaware of anyone that repairs them. Though 
there are  many places that might, typical cal and repair shops. I have a sick 
8662 also  (age) and need to dig in. At least I know the board and the most 
likely issue.  The yahoo user group has a lot of useful details.
Regards
Paul
WB8TSL






On Fri, Apr 15, 2016 at 7:08 PM, Dr. Ulrich Rohde via  time-nuts 
<_time-nuts@febo.com_ (mailto:time-nuts@febo.com) > wrote:

Thanks

Sent  from my iPhone


On Apr 15, 2016, at 6:38 PM, "John Miles" <_john@miles.io_ 
(mailto:j...@miles.io) >  wrote:

>> My  signal generator has a poor, intermittent  power  supply.  The RF
>> section is ok. Who can please  tell me which company can and  will fix 
these
>>  older
>> but excellent  generators?
>>
>>  Thanks, Ulrich
>
> Have a look at the capacitors in the voltage  divider that drives the 
bases of the switching transistors.  There's a  good chance that's your 
problem, and they probably need to be replaced even  if not.  75-TVA1607 
(Mouser 
p/n for Sprague TVA1607) works  well.
>
> It would be nice to use 105C parts if you can find  some, but the 85C 
TVA1607s have worked well for me in multiple 8662As over  several years.
>
> The other likely suspect is one of the large  screw-terminal 
electrolytics on the motherboard.  The power supply can  almost-but-not-quite 
start up 
when one of those is completely open.   High ESR is very likely to cause 
intermittent operation.
>
> --  john, KE5FX
> Miles Design LLC
>
>  ___
> time-nuts mailing  list -- _time-nuts@febo.com_ 
(mailto:time-nuts@febo.com) 
> To  unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>  and follow the instructions  there.
___
time-nuts  mailing list -- _time-nuts@febo.com_ (mailto:time-nuts@febo.com) 
To unsubscribe,  go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and  follow the instructions  there.







___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
If this email is spam, report it to
https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg3Mjk2ODEzMzpyb2JAbmMwYi5jb206ZGVsaXZlcmVk

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[Rob Sherwood .]

If you 8662A has gone "bang" yet, replace the electrolytic on the three boards 
is a good starting place.  Once it goes bang you will have a to start replacing 
solid-state devices.  

Rob, NC0B

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--- via 
time-nuts
Sent: Friday, April 15, 2016 1:04 PM
To: time-nuts@febo.com
Subject: [time-nuts] Rpair of an 8662 HP Generator



My  signal generator has a poor, intermittent power  supply.  The RF section is 
ok. Who can please tell me which company can and  will fix these older but 
excellent  generators?
 
Thanks, Ulrich 
 
 
___
time-nuts mailing  list -- time-nuts@febo.com To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the  instructions there.

___
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



--
If this email is spam, report it to
https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg3Mjk0MDA3NTpyb2JAbmMwYi5jb206ZGVsaXZlcmVk

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[KA2WEU--- via time-nuts]

Thanks
 
 
In a message dated 4/15/2016 10:02:01 P.M. Eastern Daylight Time,  
scmcgr...@gmail.com writes:

Silicon  investigations repairs them. Google the name for website

Content by  Scott
Typos by Siri

On Apr 15, 2016, at 6:38 PM, John Miles   wrote:

>> My  signal generator has a  poor, intermittent power  supply.  The RF
>> section is ok.  Who can please tell me which company can and  will fix 
these
>>  older
>> but excellent  generators?
>> 
>>  Thanks, Ulrich
> 
> Have a look at the capacitors in the voltage  divider that drives the 
bases of the switching transistors.  There's a  good chance that's your 
problem, and they probably need to be replaced even if  not.  75-TVA1607 
(Mouser 
p/n for Sprague TVA1607) works well.   
> 
> It would be nice to use 105C parts if you can find some, but  the 85C 
TVA1607s have worked well for me in multiple 8662As over several  years. 
> 
> The other likely suspect is one of the large  screw-terminal 
electrolytics on the motherboard.  The power supply can  almost-but-not-quite 
start up 
when one of those is completely open.  High  ESR is very likely to cause 
intermittent operation. 
> 
> -- john,  KE5FX
> Miles Design LLC
> 
>  ___
> time-nuts mailing list  -- time-nuts@febo.com
> To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions  there.
___
time-nuts mailing  list -- time-nuts@febo.com
To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the  instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[Scott McGrath]

Silicon investigations repairs them. Google the name for website

Content by Scott
Typos by Siri

On Apr 15, 2016, at 6:38 PM, John Miles  wrote:

>> My  signal generator has a poor, intermittent power  supply.  The RF
>> section is ok. Who can please tell me which company can and  will fix these
>> older
>> but excellent  generators?
>> 
>> Thanks, Ulrich
> 
> Have a look at the capacitors in the voltage divider that drives the bases of 
> the switching transistors.  There's a good chance that's your problem, and 
> they probably need to be replaced even if not.  75-TVA1607 (Mouser p/n for 
> Sprague TVA1607) works well.  
> 
> It would be nice to use 105C parts if you can find some, but the 85C TVA1607s 
> have worked well for me in multiple 8662As over several years. 
> 
> The other likely suspect is one of the large screw-terminal electrolytics on 
> the motherboard.  The power supply can almost-but-not-quite start up when one 
> of those is completely open.  High ESR is very likely to cause intermittent 
> operation. 
> 
> -- john, KE5FX
> Miles Design LLC
> 
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[KA2WEU--- via time-nuts]

Thanks, I do not have a repair manual and I hate to abandon the signal  
generator after man years of positive use... Ulrich  
 
 
In a message dated 4/15/2016 9:14:21 P.M. Eastern Daylight Time,  
paulsw...@gmail.com writes:

 
Ulrich
To  your first question I am unaware of anyone that repairs them. Though 
there are  many places that might, typical cal and repair shops. I have a sick 
8662 also  (age) and need to dig in. At least I know the board and the most 
likely issue.  The yahoo user group has a lot of useful details.
Regards
Paul
WB8TSL






On Fri, Apr 15, 2016 at 7:08 PM, Dr. Ulrich Rohde via  time-nuts 
<_time-nuts@febo.com_ (mailto:time-nuts@febo.com) > wrote:

Thanks

Sent  from my iPhone


On Apr 15, 2016, at 6:38 PM, "John Miles" <_john@miles.io_ 
(mailto:j...@miles.io) >  wrote:

>> My  signal generator has a poor, intermittent  power  supply.  The RF
>> section is ok. Who can please  tell me which company can and  will fix 
these
>>  older
>> but excellent  generators?
>>
>>  Thanks, Ulrich
>
> Have a look at the capacitors in the voltage  divider that drives the 
bases of the switching transistors.  There's a  good chance that's your 
problem, and they probably need to be replaced even  if not.  75-TVA1607 
(Mouser 
p/n for Sprague TVA1607) works  well.
>
> It would be nice to use 105C parts if you can find  some, but the 85C 
TVA1607s have worked well for me in multiple 8662As over  several years.
>
> The other likely suspect is one of the large  screw-terminal 
electrolytics on the motherboard.  The power supply can  almost-but-not-quite 
start up 
when one of those is completely open.   High ESR is very likely to cause 
intermittent operation.
>
> --  john, KE5FX
> Miles Design LLC
>
>  ___
> time-nuts mailing  list -- _time-nuts@febo.com_ 
(mailto:time-nuts@febo.com) 
> To  unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>  and follow the instructions  there.
___
time-nuts  mailing list -- _time-nuts@febo.com_ (mailto:time-nuts@febo.com) 
To unsubscribe,  go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and  follow the instructions  there.







___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[paul swed]

Ulrich
To your first question I am unaware of anyone that repairs them. Though
there are many places that might, typical cal and repair shops. I have a
sick 8662 also (age) and need to dig in. At least I know the board and the
most likely issue. The yahoo user group has a lot of useful details.
Regards
Paul
WB8TSL



On Fri, Apr 15, 2016 at 7:08 PM, Dr. Ulrich Rohde via time-nuts <
time-nuts@febo.com> wrote:

> Thanks
>
> Sent from my iPhone
>
> On Apr 15, 2016, at 6:38 PM, "John Miles"  wrote:
>
> >> My  signal generator has a poor, intermittent power  supply.  The RF
> >> section is ok. Who can please tell me which company can and  will fix
> these
> >> older
> >> but excellent  generators?
> >>
> >> Thanks, Ulrich
> >
> > Have a look at the capacitors in the voltage divider that drives the
> bases of the switching transistors.  There's a good chance that's your
> problem, and they probably need to be replaced even if not.  75-TVA1607
> (Mouser p/n for Sprague TVA1607) works well.
> >
> > It would be nice to use 105C parts if you can find some, but the 85C
> TVA1607s have worked well for me in multiple 8662As over several years.
> >
> > The other likely suspect is one of the large screw-terminal
> electrolytics on the motherboard.  The power supply can
> almost-but-not-quite start up when one of those is completely open.  High
> ESR is very likely to cause intermittent operation.
> >
> > -- john, KE5FX
> > Miles Design LLC
> >
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[Dr. Ulrich Rohde via time-nuts]

Thanks 

Sent from my iPhone

On Apr 15, 2016, at 6:38 PM, "John Miles"  wrote:

>> My  signal generator has a poor, intermittent power  supply.  The RF
>> section is ok. Who can please tell me which company can and  will fix these
>> older
>> but excellent  generators?
>> 
>> Thanks, Ulrich
> 
> Have a look at the capacitors in the voltage divider that drives the bases of 
> the switching transistors.  There's a good chance that's your problem, and 
> they probably need to be replaced even if not.  75-TVA1607 (Mouser p/n for 
> Sprague TVA1607) works well.  
> 
> It would be nice to use 105C parts if you can find some, but the 85C TVA1607s 
> have worked well for me in multiple 8662As over several years. 
> 
> The other likely suspect is one of the large screw-terminal electrolytics on 
> the motherboard.  The power supply can almost-but-not-quite start up when one 
> of those is completely open.  High ESR is very likely to cause intermittent 
> operation. 
> 
> -- john, KE5FX
> Miles Design LLC
> 
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[Dan Rae]

On 4/15/2016 3:38 PM, John Miles wrote:
Have a look at the capacitors in the voltage divider that drives the 
bases of the switching transistors. There's a good chance that's your 
problem, and they probably need to be replaced even if not. 75-TVA1607 
(Mouser p/n for Sprague TVA1607) works well.
John for what it's worth both my 8662 and 8663 which are late (1994) 
revisions have these single 15 µF caps replaced by two parallel 10 µFs 
among other changes in the power supply area.   Maybe worth doing if 
they can be fitted...


Dan
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Rpair of an 8662 HP Generator

[John Miles]

> My  signal generator has a poor, intermittent power  supply.  The RF
> section is ok. Who can please tell me which company can and  will fix these
> older
> but excellent  generators?
> 
> Thanks, Ulrich

Have a look at the capacitors in the voltage divider that drives the bases of 
the switching transistors.  There's a good chance that's your problem, and they 
probably need to be replaced even if not.  75-TVA1607 (Mouser p/n for Sprague 
TVA1607) works well.  

It would be nice to use 105C parts if you can find some, but the 85C TVA1607s 
have worked well for me in multiple 8662As over several years. 

The other likely suspect is one of the large screw-terminal electrolytics on 
the motherboard.  The power supply can almost-but-not-quite start up when one 
of those is completely open.  High ESR is very likely to cause intermittent 
operation. 

-- john, KE5FX
Miles Design LLC

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] HP 5360A History?

[EB4APL]

Are you referring to the 00105-6013? I have one and its info.

Ignacio, EB4APL


El 15/04/2016 a las 8:31, cdel...@juno.com escribió:

The oscillator used in the 5360A is the same one used in the early 105A,
the 5061A and the 5065A.
I just call them the 105 style oscillator. They have a 115 volt
thermoswitch controlled fast warmup heater that is set to switch out once
it gets close to the set point of the proportional controller oven that
stays on all the time. 10811A units are better performers.

Cheers,

Corby


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Fast risetime pulse generator

[Morris Odell]

Hi all,

Brooke Clark wrote:

> In the HP 5100 Frequency Synthesizer they use a heater on the SRD in order to 
> increase it's 
> lifetime so that the 3 MHz drive will generate the needed harmonics. 
> http://www.prc68.com/I/HP5100.shtml These 
> assemblies are no longer available and getting an SRD with a lifetime long 
> enough to work with a 3 MHz input is a common 
> as chicken teeth.  A solution is to get a large stud mounted Varactor and 
> these do have long lifetimes.

I was so pleased to see this. It mirrored my experience exactly. A few years 
ago I restored a 5100A and its 5110A exciter. The SRD heater in the 5110A had 
developed a failed thermostat and was a charred blob. I made up a test jig and 
tested lots and lots of different diodes and as it turned out, the best 
candidate was a stud mounted varactor out of a junked transmitter from the old 
VHF cellphone system. It's worked like a charm ever since. This post (and 
webpage) has explained it beautifully.

Morris



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Fast risetime pulse generator

[paul swed]

Bill
Now this discussion gets really interesting. You are doing something and
will report results. You have my attention.
Regards
Paul
WB8TSL

On Fri, Apr 15, 2016 at 12:27 PM, BIll Ezell  wrote:

> I'm amazed at how much traffic this has generated.
> Thanks Brooke, you're exactly on-topic as usual.
>
> As I said originally, I wanted a quick-and-dirty-and-cheap, and I'm using
> an SMMD-835 SRD. Making up the test layout tonight.
> I'm starting with a 100 uA bias on the diode, and a 20 pF diode-to-load
> coupling cap, driving the SRD with a 5V 1Mhz square-wave.
>
> I'm also going to try the 2N3904 Vce-reverse-bias avalanche idea just for
> fun.
>
> I'll post again after I have some results.
>
> PS - as I've mentioned before, I trim these things. I hate the
> endlessly-requoted replies, impossible to parse what's actually been said.
>
> --- Brooke post, trimmed --
> Hi:
>
> The idea with a step recovery diode is that during forward bias the diode
> stores charge.  When the polarity reverses the diode continues to conduct
> until the charge has been depleted.  At that time the diode stops
> conducting and opens.
> Suppose this was done using a square wave. The length of the positive
> (charging) half of waveform needs to be long enough so that the diode if
> fully charged (a function of the diode lifetime and charging current).
> Then on the negative half (discharging) when all the charge has been
> extracted the diode turns of making a sharp edge.  So the diode lifetime is
> important in relation to input drive frequency.  For a sinewave drive the
> lifetime should be about 1/4 the period at the recommended drive level.
>
> --
> Bill Ezell
> --
> The day Microsoft makes something that doesn't suck
> will be the day they make vacuum cleaners.
> Or maybe Windows 10.
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] Rpair of an 8662 HP Generator

[KA2WEU--- via time-nuts]

My  signal generator has a poor, intermittent power  supply.  The RF 
section is ok. Who can please tell me which company can and  will fix these 
older 
but excellent  generators?
 
Thanks, Ulrich 
 
 
___
time-nuts mailing  list -- time-nuts@febo.com
To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the  instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] Science of Time, early registration deadline

[Rob Seaman]

Today is the early registration deadline (saving $75) for The Science of Time 
symposium, to be held by the Harvard-Smithsonian from 5-9 June 2016:

http://sot2016.cfa.harvard.edu

Your participation would be welcome, and in good company:

http://sot2016.cfa.harvard.edu/Program/registrants.html

Carpe Diem!

Rob Seaman
Catalina Sky Survey
Lunar and Planetary Laboratory

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Fast risetime pulse generator

[BIll Ezell]

I'm amazed at how much traffic this has generated.
Thanks Brooke, you're exactly on-topic as usual.

As I said originally, I wanted a quick-and-dirty-and-cheap, and I'm 
using an SMMD-835 SRD. Making up the test layout tonight.
I'm starting with a 100 uA bias on the diode, and a 20 pF diode-to-load 
coupling cap, driving the SRD with a 5V 1Mhz square-wave.


I'm also going to try the 2N3904 Vce-reverse-bias avalanche idea just 
for fun.


I'll post again after I have some results.

PS - as I've mentioned before, I trim these things. I hate the 
endlessly-requoted replies, impossible to parse what's actually been said.


--- Brooke post, trimmed --
Hi:

The idea with a step recovery diode is that during forward bias the 
diode stores charge.  When the polarity reverses the diode continues to 
conduct until the charge has been depleted.  At that time the diode 
stops conducting and opens.
Suppose this was done using a square wave. The length of the positive 
(charging) half of waveform needs to be long enough so that the diode if 
fully charged (a function of the diode lifetime and charging current).  
Then on the negative half (discharging) when all the charge has been 
extracted the diode turns of making a sharp edge.  So the diode lifetime 
is important in relation to input drive frequency.  For a sinewave drive 
the lifetime should be about 1/4 the period at the recommended drive level.


--
Bill Ezell
--
The day Microsoft makes something that doesn't suck
will be the day they make vacuum cleaners.
Or maybe Windows 10.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Lea-6T Math error?

[Azelio Boriani]

Did you use the CFG-TMODE svinVarLimit to set 350 and the svinMinDur
to set 32400?
The CFG-TMODE svinVarLimit is a variance in squared mm, not a standard
deviation...

On Fri, Apr 15, 2016 at 6:27 AM, Bob Stewart  wrote:
> I hope I haven't posted about this before, but it's something that's bugged 
> me for awhile.  When I run a survey-in on an LEA-6T, the 
> CFG-TMODE2->fixedPosAcc value seems to be wrong.  For instance, I ran a 
> survey today and told it to run for 32,400 seconds and reach at least 350mm 
> accuracy.  When it finished, TIM-SVIM reported it had run 38,126 seconds with 
> a mean 3D std deviation of 350mm.  OK, so far.  So, I go look in the 
> CFG-TMODE2 structure and it reports 122mm.  That seems a bit odd, but OK.  
> And then I squared 350, and came up with 122500.  It appears that instead of 
> just moving the 350mm value over to the TMODE structure, they've squared it 
> and divided it by 1000.  I've noticed this happening on at least 2 versions 
> of the 6T.  I suppose I should do the same test on the M8T.
>
> Bob
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Lea-6T Math error?

[Azelio Boriani]

Yes, I see: the fixedPosAcc should be 18mm not 122.

On Fri, Apr 15, 2016 at 12:15 PM, Azelio Boriani
 wrote:
> Did you use the CFG-TMODE svinVarLimit to set 350 and the svinMinDur
> to set 32400?
> The CFG-TMODE svinVarLimit is a variance in squared mm, not a standard
> deviation...
>
> On Fri, Apr 15, 2016 at 6:27 AM, Bob Stewart  wrote:
>> I hope I haven't posted about this before, but it's something that's bugged 
>> me for awhile.  When I run a survey-in on an LEA-6T, the 
>> CFG-TMODE2->fixedPosAcc value seems to be wrong.  For instance, I ran a 
>> survey today and told it to run for 32,400 seconds and reach at least 350mm 
>> accuracy.  When it finished, TIM-SVIM reported it had run 38,126 seconds 
>> with a mean 3D std deviation of 350mm.  OK, so far.  So, I go look in the 
>> CFG-TMODE2 structure and it reports 122mm.  That seems a bit odd, but OK.  
>> And then I squared 350, and came up with 122500.  It appears that instead of 
>> just moving the 350mm value over to the TMODE structure, they've squared it 
>> and divided it by 1000.  I've noticed this happening on at least 2 versions 
>> of the 6T.  I suppose I should do the same test on the M8T.
>>
>> Bob
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] HP 5360A History?

[cdelect]

The oscillator used in the 5360A is the same one used in the early 105A,
the 5061A and the 5065A.
I just call them the 105 style oscillator. They have a 115 volt
thermoswitch controlled fast warmup heater that is set to switch out once
it gets close to the set point of the proportional controller oven that
stays on all the time. 10811A units are better performers.

Cheers,

Corby

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] Lea-6T Math error?

[Bob Stewart]

I hope I haven't posted about this before, but it's something that's bugged me 
for awhile.  When I run a survey-in on an LEA-6T, the CFG-TMODE2->fixedPosAcc 
value seems to be wrong.  For instance, I ran a survey today and told it to run 
for 32,400 seconds and reach at least 350mm accuracy.  When it finished, 
TIM-SVIM reported it had run 38,126 seconds with a mean 3D std deviation of 
350mm.  OK, so far.  So, I go look in the CFG-TMODE2 structure and it reports 
122mm.  That seems a bit odd, but OK.  And then I squared 350, and came up with 
122500.  It appears that instead of just moving the 350mm value over to the 
TMODE structure, they've squared it and divided it by 1000.  I've noticed this 
happening on at least 2 versions of the 6T.  I suppose I should do the same 
test on the M8T.

Bob
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.