NSi Industries DGS100A Series - Manual (Page 12)

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4 . A “PF” on the display indicates a Power Failure and
the unit requires AC power to operate . The time and
date are protected for 7 days by the super cap . The
program is retained in permanent memory .
5 . A “Lo” on the display indicates that the super cap
has run low and the unit needs to be powered with AC .
A minimum of 8 hours is required to fully charge the
super cap .