B&K Precision 886 - Manual - Manual (Page 26)

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2.2.2 Battery Recharging/AC operation
Caution
!
Only the Models 885 or 886 standard accessory AC to DC
adapter can be used with Model 885. Other battery eliminator
or charger may result in damage to Modes 885 or 886.
The Models 885 & 886 works on external AC power or internal
batteries. To power the Model 885 with AC source, make sure that
the Models 885 or 886 is off, then plug one end of the AC to DC
adapter into the DC jack on the right side of the instrument and the
other end into an AC outlet.
There is a small slide switch inside the battery compartment
called Battery Select Switch. If the Ni-Mh or Ni-Cd rechargeable
batteries are installed in Models 885 or 886, set the Battery Select
Switch to "Ni-Mh" position. The Ni-Mh or Ni-Cd batteries can be
recharged when the instrument is operated by AC source. The LED
for indicating battery charging will light on. If the non-rechargeable
batteries (such as alkaline batteries) are installed in Models 885 or
886, set the Battery Select Switch to "NORM" position for
disconnecting the charging circuit to the batteries.
Warning
The Battery Select Switch must be set in the "NORM"
position when using non-rechargeable batteries.
Non-rechargeable batteries may explode if the AC adapter is
used with non-rechargeable batteries. Warranty is voided if
this happened.