Measurement-computing USB-231 Manual de usuario descargar pdf (Pagina 23)

USB-231 User's Guide Specifications

Analog output

Table 3. Analog output specifications

Parameter Condition Specification

Resolution 16 bits, 1 in 65,536

Output range ±10 V

Number of channels 2

Update rate Hardware paced 5 kS/s simultaneous per channel max, hardware-paced

Trigger sources Software, TRIG

Output current drive

±5 mA

Short circuit current

±11 mA

Slew rate 3 V/µs

Output impedance 0.2 Ω

Absolute accuracy (no load)

Typical at full scale 8.6 mV

Maximum over temperature,

full scale

32 mV

INL ±4 LSB

DNL 16 bits no missing codes

Power-on state 0 V

Startup glitch –7 V for 10 µs

Timebase

The following specifications apply to hardware-paced analog input and analog output sampling accuracy.

Parameter Specification

Timebase frequency 80 MHz

Timebase accuracy

±100 ppm

Timing resolution 12.5 ns

Digital input/output

Table 4. Digital I/O specifications

Parameter Specification

Compatibility LVTTL, 3.3 V LVCMOS

Number of channels 8 (DIO0 through DIO7)

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

Pull-down resistor 47.5 kΩ to digital ground (GND).

Absolute maximum voltage

range

–0.3 V to 5 V with respect to digital ground (GND)

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Measurement-computing USB-231 Manual de usuario Pagina 23