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Under the manual range mode , Every
pressing to this key will make the range
get to upper one.press this key for more
than 2 sec. will back to auto range
mode .
3.3. HOLD
（
Data Hold
）
：
Press this button,
the reading is locked; Press it again, the
lock is cleared and enter into normal
measurement status.
3.4 REL (Relative Value Measurement):
The relative value measurement of all
functions could be conducted by
pressing this button except the Hz/Duty
function.(Frequency/duty
cycle):press
this key to select frequency or duty
cycle measurement mode.
4.Knob Switch
：
It could be used to change
the measurement function and range.
5. Input Terminals
