circulution Chemical Shift Measured in parts per million. Ratio of shift downfield from TMS(Hz) to total spectrometer frequency(Hz). Same value for 60,100,or 300 MHz machine. Called the delta scale. => Chapter 13 14 Chapter 13 14 Chemical Shift • Measured in parts per million. • Ratio of shift downfield from TMS (Hz) to total spectrometer frequency (Hz). • Same value for 60, 100, or 300 MHz machine. • Called the delta scale. =>