Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Erik Malund
02/15/06 07:54
Read: 1246 times
Mt Airy, Nc
USA


 
#110059 - that is a bad idea
Responding to: Terry Lingle's previous message
If you use 1% it is guaranteed to be within 1% within some temperature etc limits and ALL may thus be within 0.1% at 25C. If you take a 1% device and heat it some degrees, it may drift 1% and still be valid, but there is no guarantee, knowledge or whatever how a 'selected' device will behave as to staying within 'selected' range.
I had an experience some years go where a batch of 1% resistors was "ultra precise" (waaay better than 0.1% and I had the opportunity to ask someone from the manufacturer "why do you sell devices this precise as 1%?" the answer was "this is the only way we can have them within 1% for the specified temperature range and aging"

Erik

List of 157 messages in thread
TopicAuthorDate
Measuring capacitance very precisely.      Prahlad J. Purohit      02/13/06 09:06      
   "I want the best money can buy, but I do      Erik Malund      02/13/06 09:24      
      In this specific case I disagree.      Kalpak Dabir      02/13/06 11:22      
   Bridge?      Andy Neil      02/13/06 09:31      
      Bridge!      Oliver Sedlacek      02/13/06 09:58      
   AC bridge      Steve M. Taylor      02/13/06 14:19      
      Error Sources      Bruce Bailey      02/13/06 15:04      
         Blumlein Bridge        Steve M. Taylor      02/13/06 16:59      
            Blumlein Bridre.      Prahlad J. Purohit      02/14/06 22:11      
               Bridge excitation      Oliver Sedlacek      02/15/06 03:18      
            Blumlein      Ian Bell      02/16/06 03:21      
   Let the statistics be your friend...        Kai Klaas      02/13/06 19:19      
      frequency meter      Christian Kleiber      02/14/06 07:30      
      Product as a Transfer Standard      Bruce Bailey      02/14/06 09:31      
         Distributor of your confidence      Kai Klaas      02/22/06 07:17      
            Suppliers like that ...      Bruce Bailey      02/22/06 07:58      
               why blame the suppliers      Erik Malund      02/22/06 08:06      
                  Not at all      Kai Klaas      02/22/06 10:08      
                  Hah!      Bruce Bailey      02/22/06 10:28      
      Statistics for reference determination.      Prahlad J. Purohit      02/15/06 00:02      
         You got it!      Kai Klaas      02/15/06 07:42      
   questions      Erik Malund      02/15/06 06:24      
      he wants to select to 0.1% from 1% stock      Terry Lingle      02/15/06 07:13      
         that is a bad idea      Erik Malund      02/15/06 07:54      
            Hmm      Kai Klaas      02/15/06 08:10      
      That's a good way      Kai Klaas      02/15/06 07:48      
         posts cross timed      Erik Malund      02/15/06 08:04      
            It makes sense to select them      Kai Klaas      02/15/06 08:18      
      No sorting of Caps.      Prahlad J. Purohit      02/15/06 08:16      
         then, are you not using the wrong approa      Erik Malund      02/15/06 09:27      
            Time constant      Kai Klaas      02/15/06 10:16      
            Re: Eliminate cap sorting      Prahlad J. Purohit      02/15/06 22:06      
               Example      Steve M. Taylor      02/16/06 02:57      
               you do not need precision, you need rate      Erik Malund      02/16/06 06:36      
         Would it not be easier the other way?      Kalpak Dabir      02/15/06 10:35      
            Difficult      Kai Klaas      02/15/06 11:45      
               Yes Digital Difficult.      Prahlad J. Purohit      02/15/06 21:58      
                  I think the point has been missed again.      Jez Smith      02/16/06 07:54      
                     Demo ?      Steve M. Taylor      02/16/06 09:28      
                        Difficult to change now.      Prahlad J. Purohit      02/16/06 09:48      
                           Don't worry      Kai Klaas      02/16/06 09:59      
                              Re: Dont Worry.      Prahlad J. Purohit      02/17/06 08:07      
                                 How to calibrate an integrator?        Kai Klaas      02/19/06 13:29      
                                    Re: How to calib. an integratrator.      Prahlad J. Purohit      02/19/06 21:59      
                                       Answers      Kai Klaas      02/20/06 06:33      
                                    256Hz too fast.      Prahlad J. Purohit      02/20/06 02:51      
                                       Integrator and RMS using DSP      Kalpak Dabir      02/20/06 03:17      
                                          Whats available easily.      Prahlad J. Purohit      02/20/06 09:38      
                                             dsPIC30F2010      Kalpak Dabir      02/20/06 09:49      
                                                500 kSPS      Mahmood Elnasser      03/16/06 09:43      
                                                   This little PICcy got eaten, the SILabs      Erik Malund      03/16/06 10:33      
                                                      Is that useful?      Kalpak Dabir      03/19/06 07:09      
                                                         Planning to use dspic.      Prahlad J. Purohit      03/19/06 07:35      
                                                         Speed ?      Steve M. Taylor      03/19/06 07:55      
                                                            But for what purpose?      Kalpak Dabir      03/19/06 11:36      
                                                               MAC      Steve M. Taylor      03/19/06 12:16      
                                                                  it is amazing      Erik Malund      03/20/06 07:41      
                                                                     Here is the analysis      Kalpak Dabir      03/20/06 09:36      
                                                                        the content, not the words      Erik Malund      03/20/06 10:54      
                                                                           analysis please      Kalpak Dabir      03/20/06 11:38      
                                                                              since you, just like me, have no idea ab      Erik Malund      03/20/06 13:12      
                                                                                 Ah! The Horatio quote version 2!      Kalpak Dabir      03/20/06 19:30      
                                                                                    again, you focus on words, not content      Erik Malund      03/21/06 06:45      
                                                                                       Which is why I asked...      Kalpak Dabir      03/21/06 11:34      
                                                                                          If what you are saying is that I can not      Erik Malund      03/21/06 12:29      
                                                                                          I had to.      Steve M. Taylor      03/21/06 13:52      
                                                                                             You said it!      Kalpak Dabir      03/22/06 00:07      
                                                                              Analog integrator      Kai Klaas      03/20/06 18:48      
                                       How do you calculate the RMS?      Kai Klaas      02/20/06 06:48      
                                          RMS in detail.      Prahlad J. Purohit      02/20/06 09:35      
                                          Out of interest.      Steve M. Taylor      02/20/06 11:53      
                                             wot you want a RMS demo,steve??      Jez Smith      02/21/06 04:52      
                                                FIXED point      Steve M. Taylor      02/21/06 11:13      
                                                   fixed point is almost as bad      Jez Smith      02/21/06 14:16      
                                       Alternative        Kai Klaas      02/20/06 13:30      
                                          NCO again      Steve M. Taylor      02/20/06 16:17      
                                             Would be nice      Kai Klaas      02/22/06 06:45      
                                                Timer2 of 89C52      Kalpak Dabir      02/22/06 06:58      
                                                   clever      Steve M. Taylor      02/22/06 08:38      
                                                      Oops! Incomplete statement      Kalpak Dabir      02/22/06 10:11      
                                                         Clock feedthrough      Kai Klaas      02/22/06 10:38      
                                                            Maxim App note        Steve M. Taylor      02/22/06 10:51      
                                                               Nice links, thanks!      Kai Klaas      02/22/06 10:54      
                                                               AD9832      Steve M. Taylor      02/22/06 14:13      
                                                            sine vawe      Erik Malund      02/24/06 11:35      
                                          Re: Alternative.      Prahlad J. Purohit      02/20/06 22:34      
                                             Will work      Kai Klaas      02/21/06 05:49      
                                          Re: 64Hz Gain 1.126.      Prahlad J. Purohit      02/21/06 03:41      
                                             Maximum input voltage range      Kai Klaas      02/21/06 06:17      
                                                Re: Max. Input voltage Range.      Prahlad J. Purohit      02/22/06 04:58      
                                                   You have got it      Kai Klaas      02/22/06 06:44      
                                                      indeed, and      Erik Malund      02/22/06 07:44      
                                                         Is the resistor in gnd really needed.      Prahlad J. Purohit      02/22/06 08:11      
                                                            Negligible with CMOS Opamps      Kai Klaas      02/22/06 09:16      
                                                               Re: Negligible with CMOS Opamps.      Prahlad J. Purohit      02/24/06 03:08      
                                                                  Most opamp datasheet do specify      Kalpak Dabir      02/24/06 07:53      
                                                                  Input Bias Current      Steve M. Taylor      02/24/06 09:55      
                                                                  Impedance matching      Kai Klaas      02/24/06 20:00      
                                                                     Re: Impedence Matching.      Prahlad J. Purohit      02/24/06 21:33      
                                                         yess balancing is required and to that..      Abhishek Singh      02/22/06 19:09      
                                          4u7 Cap polarity and type.      Prahlad J. Purohit      02/23/06 03:57      
                                             Foil caps are needed      Kai Klaas      02/23/06 06:04      
                                                Available Capacitors.      Prahlad J. Purohit      03/07/06 01:31      
                                                   This one      Kai Klaas      03/07/06 07:39      
                                                      What are these MK equivalents      Prahlad J. Purohit      03/07/06 07:51      
                                                         MKT, MKP, MKC, KT, KP, KC,...      Kai Klaas      03/07/06 20:14      
                                                            Thanks Kai,      Prahlad J. Purohit      03/08/06 06:17      
                                          Ground Planes.      Prahlad J. Purohit      03/09/06 08:11      
                                             Have you had problems?      Kai Klaas      03/09/06 08:16      
                                                RE: Have you had problems.      Prahlad J. Purohit      03/09/06 08:19      
                                                   Keep the oscillator away from output      Kai Klaas      03/09/06 08:52      
                                                      Board Layouts.      Prahlad J. Purohit      03/09/06 09:53      
                                                         Recommendations      Kai Klaas      03/09/06 17:55      
                                                            Corrected Board      Prahlad J. Purohit      03/10/06 01:59      
                                                               I try to draw it for you      Kai Klaas      03/10/06 06:40      
                                                                  RE: I try to draw it.      Prahlad J. Purohit      03/11/06 08:28      
                                                                     Here it is        Kai Klaas      03/11/06 08:49      
                                                                        RE: Corrected Ver 2.0      Prahlad J. Purohit      03/12/06 01:44      
                                                                           Answers      Kai Klaas      03/13/06 06:51      
                                                                              Re: Corrected Ver. 3.0      Prahlad J. Purohit      03/14/06 03:30      
                                                                                 Some hints      Kai Klaas      03/16/06 09:02      
                                                                                    Re: I am in trouble.      Prahlad J. Purohit      03/16/06 09:35      
                                                                                       Sorry!      Kai Klaas      03/16/06 09:44      
                                                                                       Is this schematic correct.      Prahlad J. Purohit      03/16/06 09:45      
                                                                                          Corrections      Kai Klaas      03/16/06 10:04      
                                                                                             Re: Correction.      Prahlad J. Purohit      03/16/06 10:17      
                                                                                                Mylars will do      Kai Klaas      03/16/06 18:49      
                                                                                             Corrected Board and schematics Ver 4.0      Prahlad J. Purohit      03/19/06 01:44      
                                                                                                Why not doing it like this?      Kai Klaas      03/19/06 19:47      
                                                                                                   Re: Corrected boards ver 5.0      Prahlad J. Purohit      03/20/06 03:43      
                                                                                                      Some hints      Kai Klaas      03/20/06 11:50      
                                                                                                         Corrected board ver: 6.0      Prahlad J. Purohit      03/21/06 07:29      
                                                                                                            Please remove it...      Kai Klaas      03/21/06 07:49      
                                                                                                               Yes removed Gnd plane from mount hole.      Prahlad J. Purohit      03/21/06 08:00      
                                                                                                                  Looks good now      Kai Klaas      03/21/06 08:15      
                                                                                                                     Does than mean Green signal.      Prahlad J. Purohit      03/21/06 08:16      
                                                                                                                        Yes      Kai Klaas      03/21/06 08:41      
                                                                                                                           Thanks Kai.      Prahlad J. Purohit      03/21/06 19:44      
                                                                        trying to understand that      Abhishek Singh      03/13/06 21:52      
                                                                           DC impedance of ground plane      Kai Klaas      03/16/06 09:35      
                                          bipolar swings how and where?      Abhishek Singh      03/09/06 09:27      
                                             Here      Kai Klaas      03/09/06 09:30      
                                                explain a bit please      Abhishek Singh      03/09/06 10:19      
                                                   Explaination      Kai Klaas      03/09/06 10:55      
                           Me ?      Steve M. Taylor      02/16/06 10:20      
                        Exactly!!      Kai Klaas      02/16/06 09:57      
   as requested a demo.....,sort of      Jez Smith      02/16/06 13:47      
   simulation results of the demo...sort of      Jez Smith      02/16/06 23:53      
      Thanks Jez.      Prahlad J. Purohit      02/17/06 08:01      
   Changing Q7 to Q9.      Prahlad J. Purohit      03/16/06 10:23      
   AD7142/AD7745      Aubrey Kagan      04/10/06 07:26      
      Only good for a few pF      Kai Klaas      04/10/06 09:11      
         My apologies      Aubrey Kagan      04/10/06 09:26      
            No need to apologize!      Kai Klaas      04/10/06 10:43      
         Nice part      Steve M. Taylor      04/10/06 13:23      
   Built Precision Sine Wave Generator.      Prahlad J. Purohit      04/11/06 08:38      
      Good luck      Kai Klaas      04/11/06 09:10      

Back to Subject List