An inelastic electron tunneling spectrometer is described which is capable of providing constant‐resolution spectra over the 0 to greater than 16 000‐cm−1range. Constant‐resolution data acquisition is especially beneficial in the case of electronic transitions studied by tunneling spectroscopy. Data acquired asd2V/dI2, (d2V/dI2)/(dV/dI)2, and in constant‐resolution mode are compared. At intermediate and at high bias, either of the two latter data‐acquisition methods is superior to the first. At high bias voltage, constant‐resolution spectra are superior.