Tektronix 222 Operator's Manual page 22

Getting Started-222 DSO Operators Manual
Figure 2-1. External Power Input.
2.4
BAlTERY OPERATION
The internal battery of the instrument is a sealed lead-acid type with
four cells. The sealed cells are rechargeable using the battery-
charger adapter supplied with the instrument. Operating time is at
least two hours with a fully charged battery. When the charge level
reaches a point that only a short amount of operating time remains, a
low-battery indicator ( k d ) is displayed in the upper right corner of
the readout. The oscilloscope turns off automatically when the
battery voltage drops below
+
7.32 V.
2-2
REV JUN 1989