USER MANUAL SAGA
Page 19 of 47
Bipolar inputs
The bipolar input is used for electrophysiological measurements such as EMG, ECG
and EOG. Bipolar inputs are characterized by a pair of electrodes for a + and a –
input signal, the difference of which is recorded. The device supports up to 4 bipolar
channels, accessible via two bipolar input connectors with two bipolar channels
each. An electrode lead may have one pair of electrodes or two pairs of electrodes.
Each bipolar electrode lead plug can contain an identification that can be read out
by the application software.
Auxiliary inputs
The auxiliary inputs are to be used for connecting sensors, particularly those that
contain transducers, to SAGA. The device supports 9 auxiliary channels, which are
divided over three input connectors. Sensors that have multiple functions and/or
transducers, such as the 3D accelerometer will use the three sub-channels of an
AUX input.
An AUX sensor may contain an identification feature that can be read out by the
application software. The application software can use this identification data to
convert the data of the sensor into the correct unit.
Digital input
The digital input DIGI is an input for connecting an event trigger cable or digital serial
sensors, for example a NONIN digital saturation sensor.
Internal 3D accelerometer
The Data Recorder contains an internal
3D accelerometer that can track the
acceleration in three dimensions and the
orientation of the Data Recorder.
The figure shows how the orientation of the 3D
accelerometer inside the device is. When the
device is worn on the body, it is designed such
that the z-direction points downwards.
Synchronisation Output
The synchronization output can be used to synchronize external devices, application
software or other devices of the SAGA family. The synchronization output is
available on the Data Recorder (SYNC OUT).
By default, the SYNC OUT is configured in ‘Event Marker’ mode, meaning that a
synchronization pulse is sent out upon pressing the Event marker button. One can
configure the SYNC OUT to be a clocked pulse via the application software. The
SYNC OUT port requires a special cable which can be ordered via
