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The outside of the external power connector is connected to
+5 V. In order to avoid shortage, first connect the cable to
the Handyscope HS3 and then to the USB port.
7.1.2
Power adapter
In case a second USB port is not available, or the computer still
can't provide enough power for the instrument, an external power
adapter can be used. When using an external power adapter, make
sure that:
7.2
USB
The Handyscope HS3 is equipped with a USB 2.0 High speed (480
Mbit/s) interface with a fixed cable with type A plug. It will also
work on a computer with a USB 1.1 interface, but will then operate
at 12 Mbit/s.
7.3
Extension Connector
To connect to the Handyscope HS3 a 25 pin female D-sub con-
nector is available, containing the following signals:
the polarity is set correctly
the voltage is set to a valid value for the instrument and
higher than the USB voltage
the adapter can supply enough current (preferably >1 A)
the plug has the correct dimensions for the external power
input of the instrument
Figure 7.4: Extension connector
29
Rear panel
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