Thorough purging of all four bearing seals on each universal joint can help alleviate the possibility of mixing incompatible greases. U-joint cross, broken at a bearing surface. U-joints seldom break off at the bearing surface. It takes a very large shock load to cause this type of failure. It is also very difficult to inspect for this type of failure because they, many times, start as a small crack and progress into a complete failure some time further âdown the roadâ.
A quantity called the slew rate, which is the rate of change of gradient amplitude is usually quoted in evaluating gradient performance and potential physiological effects (e.g. a maximum slew rate of 200 Tm-1s-1).
Therefore for a comparator that is slew rate limited we have, tp = T = V SR = VOH- VOL 2Â·SR where SR = slew rate of the comparator. If SR < |maximum slope|, then the comparator is slewing. Chapter 8 â Section 1 (8/7/06) Page 8.1-13. CMOS Analog Circuit Design Â© P.E. Allen - 2006 Example 8.1-1 - Propagation Delay Time of a Comparator Find the propagation delay time of an open loop comparator that has a dominant pole at 103 radians/sec, a dc gain of 104, a slew rate of 1V/Î¼s, and a binary output voltage swing of 1V. Assume the applied input voltage is 10mV. Solution The input resolution for this comparator is 1V/104 or 0