Measurement Computing USB-TC - Manual (Page 18)

USB-TC User's Guide Specifications
18
Power
Table 9. Power specifications
Parameter Condition Specification
Supply current USB enumeration <100 mA
Supply current
(Note 8) Continuous mode 140 mA typ
User +5V output voltage range
(pins 21 and 47) Connected to self-powered hub. (Note 9) 4.75 V min to
5.25 V max
User +5V output current
(pins 21 and 47) Bus-powered and connected to a self-powered hub. (Note 9) 10 mA max
Isolation Measurement system to PC 500 VDC min
Note 8: This is the total current requirement for the device which includes up to 10 mA for the status LED.
Note 9: 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 PC’s) 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.
USB specifications
Table 10. USB specifications
Parameter Specification
USB device type USB 2.0 (full-speed)
Device compatibility USB 1.1, USB 2.0
Device power capability Self-powered, 100 mA consumption max
USB cable type A-B cable, UL type AWM 2725 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
USB cable length 3 m (9.84 ft) max
Environmental
Table 11. Environmental specifications
Parameter Specification
Operating temperature range 0 °C to 70 °C
Storage temperature range –40 °C to 85 °C
Humidity 0% to 90% non-condensing
Mechanical
Table 12. Mechanical specifications
Parameter Specification
Dimensions (L × W × H) 128.52 x 88.39 × 35.56 mm (5.06 × 3.48 × 1.43 ft)
User connection length 3 m (9.84 ft) max