Prokit's Industries MT-1620 - Manual (Page 37)

and the red test lead to the Hz jack.
4.17.2 Set the transform switch at the Hz range
position (or at the ACV range and the DCV
range, put down the “Hz%” to transform to
Hz measurement).
4.17.3 Connect test leads across the source or
load under measurement.
4.17.4 You can get reading from LCD.
4.18 DUTY CYCLE MEASURING
4.18.1 Connect the black test lead to the COM jack
and the red test lead to the Hz jack.
4.18.2 Set the transform switch at the Hz range
position.
4.18.3 Put down the "Hz%" to enter the DUTY
measurement (or set the transform switch at
the ACV range and the DCV range, put
down the “Hz%” to transform to DUTY
measurement).
4.18.4 Connect test leads across the source or
load under measurement.
4.18.5 You can get reading from LCD.
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