Characterization of a Partially-Stabilized Frequency Comb

We present measurements of the frequency interval between the Rb and the Cs D2 transitions. This interval is measured using a partially stabilized frequency comb, and the results are used to characterize the comb's accuracy. I will present an overview of the comb, the method we use to stabilize it, and our measurement methods. We measure the 32 THz interval with a precision of 0.15 MHz (4 parts per billion).