TiePie GMTO ATS5004D, User Manual

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Hardware installation
5
Drivers have to be installed before the ATS5004D is con-
nected to the computer for the first time. See chapter
4 for
more information.
5.1 Power the instrument
The ATS5004D is powered by the USB, no external power supply
is required. Only connect the ATS5004D to a bus powered USB
port, otherwise it may not get enough power to operate properly.
5.1.1 External power
In certain cases, it can be that the ATS5004D cannot get enough
power from the USB port.
When a ATS5004D is connected to a USB port, the hardware
will be powered, resulting in an inrush current, which is 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 ATS5004D will be lost.
Most USB ports can supply enough current for the ATS5004D
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 ATS5004D functions properly on one computer,
but does not on another.
In order to power the ATS5004D externally, an external power
input is provided for. It is located at the rear of the ATS5004D.
Refer to paragraph
7.1 for specifications of the external power int-
put.
Hardware installation
21