Measurement-computing USB-TC Bedienungsanleitung PDF herunterladen (Seite 18)

USB-TC User's Guide Specifications

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

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