| Prahlad J. Purohit 02/14/06 22:11 Read: 1019 times Mumbai India |
#110007 - Blumlein Bridre. Responding to: Steve M. Taylor's previous message |
Dear Andy Steve Oliver and Bruce,
Thanks to all of you for suggesting the AC bridge method. I will surely try this method but still there are a few issues with this method. 1. Getting a reference capacitor. How do I know if a cap is really 47.00nF. 2. Getting a precision source for excitation. Thanks & Regards, Prahlad Purohit |
| Topic | Author | Date |
| 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 |