OXS voltage too high, frequency is to high as well

[Konstantin Bogach]

Can someone come up with any idea why my OXS sweeps between ~15mV and
2.2V,  not between  0.1 and 1 V as it should do?  The frequency ECU
changes FV duty cycle is much high then 2 Hz as it should be.  At least
I can not see duty cycle on DMM without pressing hold button. Same
question: why could it do that?

Thanks.
Konstantin Bogach.
200tq 89