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+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.

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

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  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

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