In Reply to: RE: We need another new category, obviously. posted by Ugly on August 15, 2015 at 18:53:54:
Loopback response checks are OK for quick and dirty functional checks, but do not relate to performance of the equipment as it is used, which is either in input mode (ADC) or output mode (DAC), thereby affecting software and hardware.
In addition to interactions which give different performance, there are other problems as well. If they show a level of performance they do not provide a means to partition the performance between the input side and the output side. Worse, in some cases there is the possibility of offsetting errors. (Example might be jitter if common clock is used for ADC and DAC, depending on delays due to buffering.)
Another problem is that to be trustworthy, measurements require trustworthy test equipment and test equipment has to be fit for purpose and kept in a state of good working order and calibration.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: We need another new category, obviously. - Tony Lauck 08/16/1507:09:31 08/16/15 (21)
- Agree 100% - Ugly 08:28:31 08/16/15 (20)
- RE: Agree 100% - Tony Lauck 08:56:53 08/16/15 (19)
- When you're saying noise to signal ratio and industry says signal to noise ratio, worry. - Ugly 09:39:24 08/16/15 (0)
- RE: Agree 100% - Ugly 09:07:41 08/16/15 (17)
- RE: Agree 100% - Tony Lauck 11:57:16 08/16/15 (16)
- Let's get this straight.... - Ugly 13:43:54 08/16/15 (8)
- Truly Ugly - Tony Lauck 14:02:52 08/16/15 (7)
- See.... you needed all that scientific exchange to conclude that he "exhibits a nasty personality .... - carcass93 15:12:21 08/16/15 (1)
- RE: See.... you needed all that scientific exchange to conclude that he "exhibits a nasty personality .... - Bob_C 22:05:52 08/16/15 (0)
- RE: Truly Ugly - Ugly 15:00:59 08/16/15 (4)
- Link - Ugly 16:48:57 08/16/15 (3)
- Glad you finally got that - Dave_K 06:49:10 08/17/15 (1)
- RE: Glad you finally got that - Ugly 07:46:51 08/17/15 (0)
- But that still doesn't mean things are awesome.... - Ugly 17:28:27 08/16/15 (0)
- Wow, a 7KHz + 60 Hz IMD test? - Dave_K 12:11:16 08/16/15 (6)
- RE: Wow, a 7KHz + 60 Hz IMD test? - Tony Lauck 12:42:05 08/16/15 (5)
- I think you really do need to look at the display in this case - Dave_K 06:22:50 08/17/15 (3)
- RE: I think you really do need to look at the display in this case - Tony Lauck 08:22:42 08/17/15 (2)
- RE: I think you really do need to look at the display in this case - Dave_K 08:07:51 08/18/15 (1)
- RE: I think you really do need to look at the display in this case - Sordidman 08:45:32 08/18/15 (0)
- RE: Wow, a 7KHz + 60 Hz IMD test? - Ugly 13:35:16 08/16/15 (0)