Measurement-computing USB-1608FS Manual do Utilizador descarregar pdf (Página 19)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter Condition Specification

A/D converter type 16-bit successive approximation type

Number of channels 8 single-ended

Input configuration Individual A/D per channel

Sampling method Simultaneous

Absolute maximum input voltage CHx IN to GND ±15 V max

Input impedance 100 MΩ, min

Input ranges Software-selectable ±10 V, ±5 V, ±2 V, ±1 V

Sampling rate Scan to PC memory 0.6 S/s to 50 kS/s, software-selectable

Burst scan to 32 k sample FIFO 20 S/s to 50 kS/s, software- selectable

Throughput Software paced 500 S/s all channels

Hardware paced (Note 1) (100 kS/s) / (# of channels),

50 kS/s max for any channel

BURSTIO ≤ 32,768 total samples

(uses onboard FIFO)

(200 kS/s) / (# of channels),

50 kS/s max for any channel

Gain queue Software configurable..

Eight unique, consecutive elements – one gain

element per channel.

Resolution 16 bits

No missing codes 15 bits

Crosstalk Signal DC to 25 kHz –80 dB

CAL output User calibration source 0.625 V, 1.25 V, 2.5 V, 5.0 V,

software-selectable

CAL output accuracy (Note 2) ±0.5% typ, ±1.0% max

CAL current ±5 mA max

Trigger source Software-selectable External digital: TRIG_IN

Note 1: Maximum throughput when scanning in hardware paced mode is machine dependent.

Note 2: Actual values used for calibration are measured and stored in EEPROM.

Table 2. Calibrated absolute accuracy

Range Accuracy (mV)

±10 V 5.66

±5 V 2.98

±2 V 1.31

±1 V 0.68

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 25 26

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