A discussion of calibrations and a summary of the GHRS calibration plan for Cycle 5 is presented in Chapter 5. You should not need to measure sensitivity for yourself because the GHRS is highly stable and we believe we have performed sensitivity measures as well as they can be done.
Wavelengths are another matter.
However, the wavelength zero point can drift because of temperature changes and the effects of the Earth's magnetic field. Because of these latter effects, we recommend that individual exposures not exceed 5 to 10 minutes in length. That prevents any loss of resolution from smearing. If the zero point of the wavelength scale of your spectrum is important to your science, you may wish to obtain a wavecal as part of your program. A wavecal should always precede the science observations to which it will apply.