Measurement Computing USB-2408 Series - Manual (Page 30)

USB-2408 Series User's Guide Specifications
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Power
Table 23. Power specifications
Parameter Conditions Specification
Supply current (Note 8) Quiescent current 275 mA
Voltage supervisor limits 4.5 V > V
ext
or V
ext
> 5.5 V PWR LED = Off; (power fault)
4.5 V < V
ext
< 5.5 V PWR LED = On
+5 V user output voltage range Available at terminal block pin 40 4.75 V min to 5.25 V max
+5 V user output current Available at terminal block pin 40 10 mA max
Isolation Measurement system to PC 500 VDC min
Note 8: This is the total quiescent current requirement for the USB-2408 Series which includes up to 10 mA
for the status LED. This does not include any potential loading of the digital I/O bits, +5 V user
terminal or the AOUTx outputs.
USB specifications
Table 24. USB specifications
Parameter Specifications
USB device type USB 2.0 (full-speed)
Device compatibility USB 1.1, USB 2.0
USB cable type A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
USB cable length 3 meters max
Environmental
Table 25. Environmental specifications
Parameter Specifications
Operating temperature range 0 °C to 50 °C max
Storage temperature range –40 °C to 85 °C max
Humidity 0 to 90% non-condensing max
Mechanical
Table 26. Mechanical specifications
Parameter Specifications
Dimensions (L x W x H) 127

89.9

35.6 mm (5.00 x 3.53 x 1.40 in.)
User connection length 3 meters max
Screw terminal connector type and pinout
Table 27. Screw terminal connector specifications
Connector type Fixed screw terminal
Wire gauge range 16 AWG to 30 AWG