Table of Contents
Advertisement
Power Supply
G0 and G1 cameras are powered from the USB cable. No external power
supply is necessary.
The current limit for single USB device is 500 mA from 5 V supply. The
current required by G1 CCD cameras varies depending on the camera
operation mode. The following table summarizes camera consumption.
Either way, G1 cameras do not reach the allowed 500 mA limit, defined in
USB specification.
Camera operation mode
Idle, fan off
Idle, fan on
Image digitization, fan off
Image digitization, fan on
G0 cameras are not equipped with fan, so their power consumption equals
to power consumption of G1 cameras with fan off.
1. If the camera is connected through non-powered USB hub, the
current available for the connected devices can be as low as
100 mA, which is insufficient. Always use powered USB hubs
when using G1 cameras.
2. Note the so-called "active USB extender cable" is in fact nothing
more than standard USB cable with a hub with single USB
connector on the far side. Such hub consumes some energy and
may not work with G1 cameras.
3. Some USB cables incorporate very thin power lines with relatively
high resistance. If the USB device consumes several hundreds
milliamperes, the voltage drop on such cable can be around one
volt. Although the G1 camera should work, some features (e.g.
temperature measurement) may be negatively affected. Always
make sure the used USB cable is as short as possible and with low-
resistance power lines.
Required current
185 mA
260 mA
285 mA
360 mA
15
Advertisement
Table of Contents
