Measurement-computing USB-1608GX-2AO Manual do Utilizador descarregar pdf (Página 19)

USB-1608GX-2AO User's Guide Specifications

Analog input/output calibration

Table 9. Analog I/O calibration specifications

Parameter

Specification

Recommended warm-up time

15 minutes min

Calibration method

Self-calibration (firmware)

Calibration interval

1 year (factory calibration)

AI calibration reference

+5 V, ±2.5 mV max. Actual measured values stored in EEPROM.

Tempco: 5 ppm/°C max

Long term stability: 15 ppm/1000 hours

AO calibration procedure

The analog output pins are internally routed to the analog input circuit.

For best calibration results, disconnect any AOUTx connections at the terminal block

pins prior to performing AOUT calibration.

Digital input/output

Table 10. Digital I/O specifications

Parameter

Specification

Digital type

CMOS

Number of I/O

Configuration

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

Pull-up configuration

The port has 47 kΩ resistors configurable as pull-ups or pull-downs (default) via

internal jumper (W1).

Digital I/O transfer rate

(system-paced)

33 to 8000 port reads/writes or single bit reads/writes per second typ,

system dependent.

Input high voltage

2.0 V min

5.5 V absolute max

Input low voltage

0.8 V 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 = –2.5 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 2.5 mA)

Output current

±2.5 mA max

External trigger

Table 11. External trigger specifications

Parameter

Specification

Trigger source

TRIG input

Trigger mode

Software programmable for edge or level sensitive, rising or falling edge, high or low

level. Power on default is edge sensitive, rising edge.

Trigger latency

1 µs + 1 clock cycle max

Trigger pulse width

100 ns min

Input type

Schmitt trigger, 33 Ω series resistor and 49.9 kΩ pull-down to ground

Schmitt trigger hysteresis

0.4 V to 1.2 V

Input high voltage

2.2 V min

5.5 V absolute max

Input low voltage

1.5 V max

–0.5 V absolute min

0 V recommended min

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