PR-655/670 User Manual
89
USB
H
UB
T
YPE
Virtually all modern computers today supply current through the Universal Serial Bus (USB) hub to power
external devices when necessary. Typically, the current supplied is 500 mA. Some external USB hubs supply only
100 mA or no current at all. The
USB Hub Type
option provides the means of selecting the power available to the
instrument via the PC. If there is insufficient current available for the USB device (PR-655/670), Windows will
issue a warning and disable the device.
D
ETERMINING
USB
H
UB
P
OWER ON
W
INDOWS
XP
1.
Click
on
.
2.
Right
click on
My Computer
in the
start
menu.
3.
Click
on
Properties
to access the
System Properties
screen.
4.
Click
on
Hardware
.
FIGURE 86 - SYSTEM PROPERTIES SCREEN
5.
Click on
Device
Manager.
6.
Expand the Universal Serial Bus controllers selection by clicking on the +. icon.
7.
Right click on USB Root Hub.
8.
Click on Propertie
s
.
9.
Click on
Power
. The
Total power available
is displayed as illustrated in
Содержание PHOTO RESEARCH SpectraScan PR-655
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Страница 25: ...PR 655 670 User Manual 9 FIGURE 10 SAMPLE EXTERNAL TRIGGER INPUT CIRCUIT DRIVERS...
Страница 106: ...PR 655 670 User Manual 90 FIGURE 87 USB POWER SCREEN Total power available Total power required...
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