Measurement Computing USB-QUAD08 - Manual (Page 31)

USB-QUAD08 User's Guide Specifications
31
Power
Table 6. Power specifications
Parameter Condition Specification
V
USB
(+5V) (Note 1)
 Connected to self-powered hub
 Connected to externally-powered root port hub
4.5 V to 5.25 V
480 mA max; 225 mA typ
V
USER
(+5V) current 4.5 V to 5.25 V; 20 mA max
Encoder supply External supply of 1.5 A @ 5 VDC fused up to 42.4 V
pk
(50 V
DC
) @ 2 A
Protection diodes (30BQ060, 0.5V
max
drop) protecting against reverse polarity.
Encoder supply fuse 0452002. - Littelfuse 2A NANO2® Slo-Blo® Subminiature Surface Mount Fuse
Note 1: "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)
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. If your laptop PC is constrained to the
100 mA max, use a self-powered hub.
Environmental
Table 7. Environmental specifications
Parameter Specification
Operating temperature range 0 °C to 60 °C
Storage temperature range –40 °C to 85 °C
Humidity 0% to 90% non-condensing
Mechanical
Table 8. Mechanical specifications
Parameter Specification
Dimensions (L × W × H) 245 × 146 × 50 mm (9.6 × 5.7 × 2.0 in.)
USB specifications
Table 9. USB specifications
Parameter Specification
Device type USB 2.0 high-speed mode (480 Mbps) if available (recommended), otherwise, USB 1.1
full-speed mode (12 Mbps)
Device compatibility USB 2.0 (recommended) or USB 1.1
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 (9.84 feet)