Measurement-computing USB-1608FS-Plus Manuel d'utilisateur télécharger pdf (Page 18)

USB-1608FS-Plus User's Guide Specifications

Table 3. Accuracy components - All values are (±)

Range

Gain error

(% 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

Noise performance

Table 4. Noise performance

Range

Typical counts

LSBrms

±10 V

1.52

±5 V

1.52

±2 V

1.67

±1 V

2.12

Table 4 summarizes the noise performance for the USB-1608FS-Plus. 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 100 kS/s.

Digital input/output

Table 5. Digital I/O specifications

Parameter

Specification

Digital type

5V TTL

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 resistors (default).

May be changed to pull-down using an internal jumper.

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

4.4 V min (IOH = –50 µA)

3.76 V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Power on and reset state

Input

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24

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