Measurement Computing USB-1608FS - Manual (Page 20)

USB-1608FS User's Guide
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Table 3. Accuracy components - All values are (±)
Range % of Reading Gain error at FS (mV) Offset (mV)
±10 V 0.04 4.00 1.66
±5 V 0.04 2.00 0.98
±2 V 0.04 0.80 0.51
±1 V 0.04 0.40 0.28
Table 4 summarizes the noise performance for the USB-1608FS. Noise distribution is determined by gathering
50 k samples with inputs tied to ground at the user connector. Samples are gathered at the maximum specified
sampling rate of 50 kS/s.
Table 4. Noise performance
Range Typical counts LSBrms
±10 V 10 1.52
±5 V 10 1.52
±2 V 11 1.67
±1 V 14 2.12
Digital I/O
Table 5. Digital I/O specifications
Parameter Specification
Digital type CMOS
Number of I/O 8 (DIO0 through DIO7)
Configuration Independently configured for input or output
Pull-up/pull-down configuration All pins pulled up to 5V via 47 k
Ω resistors (default).
Hardware revisions E and later may be changed to pull-down using an internal
user-configurable jumper.
Previous revisions can be configured for pull-down at the factory.
Input high voltage threshold 2.0 V min
Input high voltage limit 5.5 V absolute max
Input low voltage threshold 0.8 V max
Input low voltage limit –0.5 V absolute min
0 V recommended min
Output high voltage
(IOH = –2.5 mA) 3.8 V min
Output low voltage
(IOL = 2.5 mA) 0.44 V max
Power on and reset state Input