Dennis,
I was setting the DMM for waveform acquisition, which, apparently, will acquire a waveform in a loop internal to the DMM. That was causing my problem. When I set up the DMM for individual readings and put it in a loop, that solved the problem.
thanks for all your help!
Reece L. Bain, Jr.
Electronics Engineer, Stf.
Lockheed Martin Aeronautics Co.