What would make my VFD output freq read high?

I am using a Fluke 192B scopemeter (o-scope) to measure the output frequency of a Yaskawa F7 drive vs the 0-10v frequency reference. The drive says it's outputting 7.25Hz, but the scopemeter reads 2Khz, with intermittent dips. Maybe I have the scope leads wrong? I have the clip on earth ground (or in air, reads the same) and the probe on one phase of the drive output. Maybe there's too much switching going on in the drive to create a single "sine" wave period and the scope is reading all the switches? Maybe I need to use a scope with a filter? Whats going on here?!