RIGOL DM3058 - Manual (Page 69)

RIGOL
User’s Guide for DM3058/DM3058E 2-47
When the readings exceed selected lower limit, the Vice display will show “LO
FAIL.
When the readings exceed either upper or lower limit, an alarm will be given
(when the sound is open).
The range of P/F function:
 The P/F range is -120%~+120% of the current measurement range.
 The upper limit value should be always bigger than the lower limit value.
 The upper and lower values are stored in volatile memory. They will be set
to defaults when power on.