Measurement Computing USB-TEMP-AI - Manual (Page 27)

USB-TEMP-AI User's Guide Specifications
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Power
Table 20. Power specifications
Parameter Conditions Specification
Supply current USB enumeration <100 mA
Supply current
(Note 21) Quiescent mode with all inputs
configured for Disabled mode 270 mA typ
User +5V output voltage range
(terminal block pin 21) 4.9 V min to 5.1 V max
User +5V output current
(terminal block pin 21) Bus-powered and connected to a
self-powered hub. (Note 21) 5 mA max
Isolation Measurement system to PC 500 VDC min
Note 21: This is the total current requirement for the device which includes up to 10 mA for the status LED.
USB specifications
Table 21. USB specifications
USB device type USB 2.0 (full-speed)
Device compatibility USB 1.1, USB 2.0
Device power capability Self-powered
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 meters max
Current excitation outputs (±Ix, T0x-T3x)
Table 22. Current excitation output specifications
Parameter Specification
Configuration 2 dedicated pairs:
 ±I1: T0x/T1x
 ±I2: T2x/T3x
Current excitation output
ranges Thermistor: 10 µA
RTD: 210 µA
Tolerance ±5.0%
Drift 200 ppm/°C
Line regulation 2.1 ppm/V max
Load regulation 0.3 ppm/V
Output compliance voltage
(relative to GND pins) 3.90 V max
–0.03 V min
Note 22: The device has two current excitation outputs, with ±I1 dedicated to the T0x/T1x analog inputs,
and ±I2 dedicated to T2x/T3x. The excitation output currents should always be used in this dedicated
configuration.
Note 23: The current excitation outputs are automatically configured based on the sensor (thermistor or
RTD) selected.
Environmental
Table 23. Environmental specifications
Operating temperature range 0 °C to 55 °C max
Storage temperature range –40 °C to 85 °C max
Humidity 0% to 90% non-condensing max