Measurement-computing USB-2404-UI Manual do Utilizador descarregar pdf (Página 16)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for the range 0 to 60 °C unless otherwise noted.

Analog input

Table 1. Analog input specifications

Parameter Conditions Specification

Number of channels

A/D converter resolution

24-bit

A/D converter type

Delta-Sigma with analog pre-filtering

Sampling mode

Simultaneous

TEDS sensor type supported

IEEE 1451.4 TEDS Class II (interface)

Input mode



Voltage

 Current

 Resistance (4-wire and 2-wire)

 RTD (3-wire and 4-wire)

 Thermocouple

 Quarter-bridge

 Half-bridge

 Full-bridge

Conversion time

(No channels in TC mode)

High speed 10 ms for all channels

Best 60 Hz rejection 110 ms for all channels

Best 50 Hz rejection 130 ms for all channels

High resolution 500 ms for all channels

Conversion time

(One or more channels in TC mode)

High speed 20 ms for all channels

Best 60 Hz rejection 120 ms for all channels

Best 50 Hz rejection 140 ms for all channels

High resolution 510 ms for all channels

Overvoltage protection Terminals 1 and 2 ±30 V

Terminals 3 through 6, across any

combination

±60 V

Input impedance Voltage mode

(±60 V, ±15 V, ±4 V)

1 MΩ

Current mode <40 Ω

All other modes

>1 GΩ

Input bias current <1 nA

Integral non-linearity (INL) ±15 ppm

Common mode rejection ratio

(CMRR)

>100 dB

Normal mode rejection ratio

(NMRR)

Best 60 Hz rejection 90 dB at 60 Hz

Best 50 Hz rejection 80 dB at 50 Hz

High resolution 65 dB at 50 Hz and 60 Hz

Input mode ranges

Table 2. Input mode range specifications

Input mode Nominal range(s) Actual range(s)

Voltage ±60 V, ±15 V, ±4 V, ±1 V, ±125 mV ±60 V, ±15 V, ±4 V, ±1 V, ±125 mV

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22

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