The low-strain rheological properties of polymeric materials are often characterized using the so-called frequency sweep, whereby the complex dynamic modulus is measured while changing the frequency of the deformation from high to low or from low to high values. Unfortunately, any measurement takes time, during which the properties of the material may change. If this is the case, the time-dependent changes will be mixed in with the frequency dependence of the sample. The multi-wave technique can alleviate this problem, but suffers in that the number of superposed waves is limited. An alternative is a conventional sweep using a set of frequencies run in random order [1]. Using real data, as well as made-up data, this presentation will show that such a procedure (1) tells the user that the material is indeed changing with time, (2) produces reasonable isochronal results, and (3) gives preliminary kinetic information. By fitting appropriate models to the results, a rheological material function can be obtained that is a valid description of the material at a known characteristic time after the beginning of the experiment. This characteristic time can be easily found by examination of the time dependence of the residuals from the modeling step. Both made-up and real examples will be used to demonstrate the performance of this procedure. [1] Shaw, M. T., 89th Annual Meeting of the Society of Rheology, 2017, Abstract PO36, p. 99.