Prokit's Industries MT-1620 - Manual (Page 25)

Press the "Hz%" again, meter will recover the Hz
range.
 When measuring at the voltage range and
current range, put down the " Hz%" to be Hz range
and the frequency of the signal for the voltage and
current are measured then. Press the " Hz%"
again to be the DUTY range and the DUTY
CYCLE of the signal for the voltage and current
are measured then. Press the " Hz%" again, meter
will be back to the condition of the voltage and
current measuring. The range of voltage and
current are locked under this condition, which can
be cancelled by rotating the transform switch or
put down the "RANGE”.
4.5 RELATIVE TRANSFORM
When measuring, put down the "REL.", meter will
be transformed at relative measuring, initial display
will show ”000”; press the "REL" again, meter will
recover the normal working condition. This can not
be used under “0L” condition.
4.6 BACK LIGHT
If the light is too dark to make the reading difficult
when measuring, you can press the ”LIGHT”
button to open the back light.
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