REFA FAMILY USER MANUAL
Page
13
of
27
User interface
3.4
On/Off Switch
When the system is connected to the external power supply, the On/Off switch is
used to switch the system on or off.
Indicator LEDs
LED
Description
POWER
INDICATOR
When the power indicator LED is off, the system has no power,
check the switch and power supply. The system is powered
when this LED is green.
CHANNEL
LEDS
Startup
At startup all LEDs light up for about 1
– 2
seconds.
Impedance
Mode
When the system is set in impedance mode, the
Impedance LEDs will light up orange if an
impedance value drops below a user defined
value or when the default value drops below 20
kOhm, or a different threshold set by the
application software.
Impedance
error
When
the
Impedance
LEDs
blink,
the
requirements for correct impedance determination
are not met. See
FUSBI
Indicator
On
System idle and connected to USB
Blinks
Fusbi is transferring data
Measurement connections
3.5
Patient Ground
The Patient Ground should always be connected in order to keep the amplifier in
range. The location of the Patient Ground is ideally away from your measurement
electrodes.
Measurement Lead Connectors: Unipolar, Bipolar, Auxiliary, Multiconnector
The number and type of inputs on your device depend on the configuration you
have. Refa devices exist in many different configurations, varying from 8 up to 136
input channels. In general, there are three types of measurement connection inputs
on the device: unipolar, bipolar or auxiliary.
Type of input
Connector
Description
