Battery-Dependent Device Behavior - GE MAC 1200 Service Manual

Battery-Dependent Device Behavior

2-6
Functional Description: PCB NC Battery Charge
Depending on the status of the battery and the status of the device, the following
behavior occurs.
State 1 Battery depleted, line power supply is connected up
Battery charged in rapid mode; when fully charged, switchover to trickle charging.
State 2 Battery full, line power supply is connected up
Battery charged in rapid mode for some minutes till the charging circuit recognizes battery
full, then switchover to trickle charging.
State 3 Battery depleted, no line power supply, device is switched on
Device inoperative.
State 4 Battery full, no line power supply, device is switched on
Device fully operative. When battery is almost depleted, the LEDBAT signal is activated to
indicate that the device should be charged by connecting to the line power supply. If the
operation is continued without line power, MAC 1200/ 1200 ST will shut down itself when a
minimum level is reached to prevent the battery from a excessive discharge.
State 5 Battery depleted, line power supply is connected up, device is switched on
Battery is charged in rapid mode, device is fully operative, including recording. During
recording, the charging current is reduced. If a lot of recordings take place in this phase,
the battery is not fully charged within 4 hours.
MAC 1200 resting ECG analysis system
2012250-095
Table 1. Battery State
Revision D