Marquette Hellige GmbH MAC 1100/1200 V 1.1 Page 11
227 492 20 D - 0002
2 Functional description
The block circuit diagram of the entire instrument in Section 1.1 and the functional
blocks of circuit diagram sheets (P-plans) describe the individual functional blocks.
2.1 Switching power supply
The switching power supply generates the fundamental device voltage for the PCB
Control CS_CI and for the PCB NC Battery Charge.
It has the following input specifications:
Input voltage range: 85 ... 264V ac
Line frequency range: 47 ... 65 Hz
The output voltage is +26.5 V dc, the maximum load is 1.5A.
2.2 PCB NC Battery Charge
MAC1200 and MAC1100 with the option “Battery” can operate battery powered. With
a new, fully charged NC battery, in Automatic Mode up to 50 ECG can be recorded.
The PCB NC Battery Charge, controls and monitors the charging process, depending
on the status of the battery and the status of the device.
Section 2.2.1 and 2.2.2 is not valid for MAC1100 without option “Battery”.
2.2.1 Charging circuit for the NC battery
An integrated charging device is used to charge the battery. During charging it
monitors the battery voltage function and switches over from rapid charging to trickle
charging.
Applying the line power to the MAC 1200, or insertion of the battery activates the
charging circuit.
During a recording, the charging current is reduced.
In standby mode, a depleted battery is fully charged within 4 hours.
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