Measurement Computing USB-1408FS - Manual (Page 25)

USB-1408FS User's Guide Specifications
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Power
Table 15. Power specifications
Parameter Conditions Specification
Supply current (Note 7) 80 mA
+5V USB power available
(Note 8) Connected to self-powered hub
Connected to externally-powered root port hub 4.5 V min, 5.25 V max
Connected to bus-powered hub 4.1 V min, 5.25 V max
Output current (Note 9) Connected to self-powered hub
Connected to externally-powered root port hub 420 mA max
Connected to bus-powered hub 20 mA max
Note 7: This is the total current requirement for the USB-1408FS which includes up to 10 mA for the status
LED.
Note 8: Self-powered hub refers to a USB hub with an external power supply. Self-powered hubs allow a
connected USB device to draw up to 500 mA.
Root port hubs reside in the PC USB host controller. The USB port(s) on your PC are root port hubs.
All externally powered root port hubs (desktop PCs) provide up to 500 mA of current for a USB
device. Battery-powered root port hubs provide 100 mA or 500 mA, depending upon the manufacturer.
A laptop PC that is not connected to an external power adapter is an example of a battery-powered root
port hub.
Bus powered hubs receive power from a self-powered or root port hub. In this case the maximum
current available from the USB +5 V is 100 mA. The minimum USB +5 V voltage level can be as low
as 4.1 V.
Note 9: Output current refers to the total amount of current that can be sourced from the USB +5 V, analog
outputs and digital outputs.
General
Table 16. General specifications
Parameter Specification
Device type USB 2.0 full speed
Device compatibility USB 1.1, USB 2.0
Environmental
Table 17. Environmental specifications
Parameter Specification
Operating temperature range 0 °C to 70 °C
Storage temperature range –40 °C to 70 °C
Humidity 0% to 90% non-condensing
Mechanical
Table 18. Mechanical specifications
Parameter Specification
Dimensions 79 × 82 × 27 mm (3.10 × 3.20 × 1.05 in.)
USB cable length 3 m (9.84 ft) max
User connection length 3 m (9.84 ft) max