Measurement-computing USB-201-OEM Manual do Utilizador descarregar pdf (Página 14)

USB-201-OEM User's Guide Specifications

Noise performance

For the peak to peak noise distribution test, the input channel is connected to AGND at the input terminal block,

and 12,000 samples are acquired at the maximum throughput.

Table 3. Noise performance specifications

Range Counts LSBrms

±10 V 5 0.76

Analog input calibration

Table 4. Analog input calibration specifications

Parameter Specification

Recommended warm-up time 15 minutes min

Calibration method Factory

Calibration interval 1 year

Digital input/output

Table 5. Digital input specifications

Parameter Specification

Digital type TTL

Number of I/O 8

Configuration Each bit may be configured as input (power on default) or output

Pull-up configuration The port has 47 kΩ resistors that may be configured as pull-up or pull-down with an

internal jumper. The factory configuration is pull-down.

Digital I/O transfer rate

(system-paced)

33 to 4000 port reads/writes per second typical, system dependent

Input low voltage threshold 0.8 V max

Input high voltage threshold 2.0 V min

Input voltage limits 5.5 V absolute max

–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)

Output current ±24 mA max

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Measurement-computing USB-201-OEM Manual do Utilizador Página 14