The batteries in the Model 887AB can be checked by turning the POWER
switch to BAT CHECK (fig 5-8).
If the batteries contain a satisfactory
charge, the meter needle will come to rest in the BATTERY OK region and
remain there for at least 10 seconds. If it does not, the batteries must be
recharged according to the instructions of paragraph 3.
Should the BAT CHECK position of the power
batteries, the following procedure would be used:
a. Connect power plug.
b. Set POWER switch to BAT CHG-LINE OPR.
c. Batteries will be fully charged and capable of at least 30 hours of
operation after 16 hours of charging. While the batteries are charging, the
instrument may be used the same as for line operation.