equalize

to equalize accounts, burdens, or taxes

But a third kingdom yet is to arise / Out of the Trojans scattered ofspring, / That in all glory and great enterprise, / Both first and second Troy shall dare to equalise.

The technique for frequency slewing of a transient is different from that for vibration testing in that it is necessary to equalize at low level as the clock frequency is slewed in relatively small increments from the nominal to the desired frequency.