Measurement-computing USB-1608FS Uživatelský manuál stáhnout pdf (Strana 20)

USB-1608FS User's Guide

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 kΩ 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

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26

Žádné komentáře

Measurement-computing USB-1608FS Uživatelský manuál Strana 20