Usb Specifications; Current Excitation Outputs (Ix+) - Measurement Computing USB-5203 User Manual

USB-5203 User's Guide
Input voltage
Input current
This is the total current requirement for the device which includes up to 10 mA for the status LED.
Note 3:
Self-powered hub refers to a USB hub with an external power supply. Self-powered hubs allow a
Note 4:
connected USB device to draw up to 500 mA. This device may not be used with bus-powered hubs due
to the power supply requirements.
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) 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

Parameter
USB device type
Device compatibility
Device power capability
USB cable type
USB cable length

Current excitation outputs (Ix+)

The device has four current excitation outputs, with I1+/I1– dedicated to the CH0/CH1 analog inputs, I2+/I2–
dedicated to CH2/CH3, I3+/I3– dedicated to CH4/CH5, and I4+/I4– dedicated to CH6/CH7. The excitation
output currents should always be used in this dedicated configuration.
The current excitation outputs are automatically configured based on the sensor (thermistor or RTD) selected.
Parameter
Configuration
Current excitation output ranges
Tolerance
Drift
Line regulation
Load regulation
Output compliance voltage
Table 18. USB specifications
Specification
USB 2.0 (full-speed)
USB 1.1, USB 2.0
Self-powered, 500 mA consumption max
A-B cable, UL type AWM 2725 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
3 m (9.84 ft) max
Table 19. Current excitation output specifications
Condition Specification
Current excitation output
4 dedicated pairs
I1+/I1–
I2+/I2–
I3+/I3–
I4+/I4–
Thermistor 10 µA typ
RTD 210 µA typ
±5% typ
200 ppm/°C
2.1 ppm/V max
0.3 ppm/V typ
Relative to GND 3.90 V max
–0.03 V min
29
Specifications
100 VAC to 240 VAC
50 Hz to 60 Hz
0.2 A
AI channel
CH0/CH1
CH2/CH3
CH4/CH5
CH6/CH7