Measurement-computing CIO-DAS16/Jr Instrukcja Użytkownika Pobierz pdf (Strona 15)

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 AD7800

Resolution 12 bits

Number of channels 8 differential or 16 single-ended, switch selectable

Input ranges ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, 0 to 10 V, 0 to 5 V, 0 to 2.5 V, 0 to

1.25 V, 0 to 0.625 V, fully programmable

Polarity Unipolar/Bipolar, software selectable

A/D pacing Programmable:

 internal counter or external source (DIG. IN 0 / TRIGGER, rising edge), or

 software polled

A/D trigger sources External polled gate trigger (DIG. IN 0 / TRIGGER, active high)

A/D triggering modes Digital: Gated pacer, software polled.

(Gate must be disabled by software after trigger event.)

Data transfer Interrupt, DMA or software polled

DMA Channel 1 or 3

A/D conversion time 3 µs

Throughput 120 kHz typical, PC dependant

Absolute accuracy 0.01% of reading ±1 LSB

Differential linearity error ±1 LSB

Integral linearity error ±1 LSB

Differential linearity error ±1 LSB

No missing codes guaranteed 12-bits

Gain drift (A/D specs) ±25 ppm/°C

Zero drift (A/D specs) ±10ppm/°C

Common mode range ±10 V

CMRR @ 60 Hz -72 dB

Input leakage current (@ 25

200 nA

Input impedance 10 Meg Ohms min

Absolute maximum input voltage ±35 V

Table 2. Noise distribution (Rate = 1-100 kHz)

Range Average % ±2 bins Average % ±1 bin Average # bins

Bipolar (10 V) 98% 86% 8 bins

Bipolar (5 V) 97% 86% 9 bins

Bipolar (2.5 V) 97% 82% 8 bins

Bipolar (1.25 V) 95% 73% 9 bins

Unipolar (10 V) 95% 79% 9 bins

Unipolar (5 V) 96% 80% 9 bins

Unipolar (2.5 V) 92% 70% 10 bins

Unipolar (1.25 V) 89% 68% 11 bins

1 2 ... 10 11 12 13 14 15 16 17 18 19

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