SEFRAM 7220 Manuel D'utilisation page 39

Time Setting of Auto Power Off
Press the function button and turn the meter on. Then press the
function button to select the time. The time can be 5 minutes,
10 minutes, 20 minutes, and disabled (AoFF).
High Frequency Rejection (HFR)
The High Frequency Rejection mode equip a low pass filter in
the AC measurements. The cut-off frequency (-3dB point) of low
pass filter is 800Hz.
  Warning
The hazardous voltage may be present even if the LCD reading
is very low in HFR mode. Verify the voltage again without HFR
mode.
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