Measurement-computing CIO-DAS08 Manual do Utilizador descarregar pdf (Página 17)

Chapter 4

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter Specification

A/D converter type AD574

Resolution 12-bits

Number of channels 8 single-ended

Input ranges ±10 V, ±5 V, 0 to +10 V, switch selectable

Polarity Unipolar/Bipolar, switch selectable

A/D pacing Software polled (typically through ISR paced by on-board counter)

A/D trigger sources External polled digital input trigger (Digital In 1)

Data transfer Software polled (typically through ISR paced by on-board counter)

DMA None

A/D conversion time 25 µs

Throughput 20 kHz, PC dependent

Accuracy ±0.01% of reading ±1 LSB

Differential linearity error ±1 LSB

Integral linearity error ±0.5 LSB

No missing codes guaranteed 12-bits

Gain drift (A/D specs) ±25 ppm/°C

Zero drift (A/D specs) ±10 µV/°C

Common Mode Range ±10 V

CMRR 72 dB

Input leakage current (@ 25

100 nA

Input impedance 10 Meg Ohms min

Absolute maximum input voltage ±35 V

Avg % ± 2 bins Avg % ± 1 bin Avg # bins

Bipolar (10 V) 100% 100% 3 bins

Bipolar (5 V) 100% 100% 3 bins

Noise Distribution (Rate = 1 to 20 kHz)

Unipolar (10 V) 100% 100% 3 bins

Digital Input / Output

Table 2. Digital input/output specifications (main connector – J1)

Digital type (main connector J1) Output: 74LS273

Input: 74LS244

Configuration 4 fixed output bits, 3 fixed input bits

Number of channels 4 out, 3 in

Output high 2.7 volts min @ -0.4 mA

Output low 0.4 volts max @ 8 mA

Input high 2.0 volts min, 7 volts absolute max

Input low 0.8 volts max, -0.5 volts absolute min

Output power-up / reset state

1 2 ... 12 13 14 15 16 17 18 19 20 21

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