TiePie Handyscope HS5 series, User Manual

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Hardware installation
5
Drivers have to be installed before the Handyscope HS5 is
connected to the computer for the first time. See chapter
4
for more information.
5.1 Power the instrument
The Handyscope HS5 is powered by the USB, no external power
supply is required. Only connect the Handyscope HS5 to a bus
powered USB port, otherwise it may not get enough power to op-
erate properly.
5.1.1 External power
In certain cases, the Handyscope HS5 cannot get enough power
from the USB port. When a Handyscope HS5 is connected to a
USB port, powering the hardware will result in an inrush current
higher than the nominal current. After the inrush current, the
current will stabilize at the nominal current.
USB ports have a maximum limit for both the inrush current
peak and the nominal current. When either of them is exceeded,
the USB port will be switched off. As a result, the connection to
the Handyscope HS5 will be lost.
Most USB ports can supply enough current for the Handyscope
HS5 to work without an external power supply, but this is not
always the case. Some (battery operated) portable computers or
(bus powered) USB hubs do not supply enough current. The exact
value at which the power is switched off, varies per USB controller,
so it is possible that the Handyscope HS5 functions properly on
one computer, but does not on another.
The Handyscope HS5 comes with a universal power supply,
that can be connected to a power outlet using the appropriate
adapter. The 3.5 mm connector attached to the power supply must
be plugged into the power connector at the rear of the Handyscope
Hardware installation
21