Tektronix 222 Operator's Manual page 106

More On How It Works-222 DSO Operators
CONT ENV: Signal variation over time are displayed by CONT ENV
mode. At SECIDIV settings of 20 ks per division and slower, positive
and negative waveform peaks that occur during a sample interval are
accumulated in the display until reset by changing the acquisition
parameters or pressing t h e m button. Use NORM Trigger MODE to
prevent the AUTO LVL or AUTO BL forced trigger from resetting the
acquisition at the slower SECIDIV settings.
NOTE
The AVG and CONT ENVdisplays do not roll at SECIDIVset-
tings from 0.1 SECIDIV and slower. The entire record is
acquired and updated. In NORM and SSEQ Trigger
MODES, the acquired displays must be triggered. AUTO
LVL andAUTO BL Trigger MODES cause the triggers to be
ignored in ROLL mode, and the data captured will not be
synchronized with a trigger event.
6.1 1 TIPS ON BAlTERY CARE
The battery in your instrument is a sealed lead-acid type battery with
four cells. These useful tips will help extend the battery life.
1. Completely recharge the battery after each discharge cycle. Con-
tinued partial recharges shorten the battery life. The battery is on
charge any time external power is used to operate the instrument.
However, the battery recharges faster when the instrument is not
operating.
2. Avoid situations that can lead to deep discharge of the battery.
If the instrument starts and remains on only briefly before shutting off,
the battery charge state is low. The instrument will not start on battery
if the voltage drops below 7.32 V. The battery must be recharged as
soon as possible when it is in this state. Do not store the battery or
instrument with the battery installed in a discharged state. Extended
storage or storage in high temperatures will deplete the remaining
charge, leading to deep discharge. When deep discharge occurs,
the battery accepts charge very slowly, and in some cases may not
recharge.
3. If a deep-discharge condition occurs, it may be possible to
recover the battery with the following procedure.
REV JUN 1989