Altimeter — Manual
7.4
Connection Schematics
7.4
Connection Schematics
The backup battery version of Indu Altimeter has two independent
circuits. The first circuit connects the instrument with the system
bus while the second circuit is used to switch the backup battery
on/off.
This gives the following combinations:
Sys. Bus
Backup
Result
Off
Off
Altimeter is switched off.
On
On
Normal operation.
Off
On
Altimeter works on backup battery only.
On
Off
Altimeter works on system bus. Battery sys-
tem error symbol appears because backup is
not available.
Table 3:
Possible backup battery switch combinations.
7.4.1
Solution With One Switch
This option is recommended. Here a single DPST switch is used.
This switch allows you to activate two independent circuits. When
switch is on, it simultaneously connects Indu Altimeter with the sys-
tem bus and activates the backup system. When the switch is off,
both circuits are disconnected. This gives you cases 1 and 2 from
Table 3.
When master is off and this switch is on, the instrument will run on
backup only (case 3). This combination can be used to perform the
capacity test.
Important: Use a switch with 1 A DC rating or more.
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