1 / 4

+15 V, -15 V measured through R/3R voltage divider gives ~ 6.7 V, not 10 V as expected.

+15 V, -15 V measured through R/3R voltage divider gives ~ 6.7 V, not 10 V as expected. attributed to myDAQ -internal connections associated with grounds such as AGND. to circumvent, use +15 V and nearby AGND to supply 15 V, rather than the 30 V orignally desired.

livvy
Download Presentation

+15 V, -15 V measured through R/3R voltage divider gives ~ 6.7 V, not 10 V as expected.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. +15 V, -15 V measured through R/3R voltage divider gives ~ 6.7 V, not 10 V as expected. attributed to myDAQ-internal connections associated with grounds such as AGND. to circumvent, use +15 V and nearby AGND to supply 15 V, rather than the 30 V orignally desired. as before, accuracy measurement can be performed using DMM channel, this time using 20 V scale. sample measurement reveals 14.90 +/- 0.09 V (compare to 30.0 +/- 0.4 V from last lecture) now, let’s measure the precision of the +15 V power supply: for observations every 5 µs (200 kS/s) for observations every 0.1 s note: DMM is not fast enough for either (a) or (b), and even if it was, coarse resolution on the DMM complicates evaluation of precision  use R/2R voltage divider in conjunction with ai0

  2. J = 2 x_1 = V_PS x_2 = V_ai0 r = V_measured = x_1 + x_2 = V_ai0 + V_PS

  3. 3-minute records ai0 monitoring 15V through V divider ai0 shorted

  4. to myDAQ 1 to myDAQ 2 2.26 kΩ to myDAQ 2 to myDAQ 1

More Related