Measurement-computing USB-2416 Manual de usuario descargar pdf (Pagina 22)

Chapter 5

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

All specifications apply to all temperature and voltage input channels unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. General analog input specifications

Parameter Conditions Specification

A/D converter type ADS1256, 24-bit Sigma Delta

A/D data rates 3750 samples per second (S/s), 2000 S/s, 1000 S/s, 500 S/s, 100 S/s,

60 S/s, 50 S/s, 25 S/s, 10 S/s, 5 S/s, 2.5 S/s

Throughput Single channel: 2.5 Hz to 1102.94 Hz, software selectable

Multiple channels: 0.16 Hz to 1102.94 Hz, software selectable

(see tables 18 and 19 for details)

Number of channels Up to 32 channels individually software-configurable as single-

ended or differential

Thermocouples require differential mode. For each channel

configured as differential, you essentially lose one single-ended

channel. You can add channels by connecting to an AI-EXP32.

Input isolation 500 VDC minimum between field wiring and USB interface

Channel configurations Temperature sensor input, software programmable to match sensor

type

Voltage input

Input voltage range Thermocouple mode ±0.078125 V

Voltage mode (Note 1) ±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,

±0.15625 V, ±0.078125 V, software- configurable

Absolute maximum

input voltage

CxH-CxL relative to

GND

±30 V maximum (power on)

±10 V maximum (power off)

Input impedance

2 GΩ (power on)

390Ω (power off)

Input leakage current ±10.6 nA

Input capacitance 590 pf

Maximum working

voltage (signal +

common mode)

Voltage mode: ±20V

range

±20.01 V maximum

Voltage mode: all other

voltage input ranges

±10.25 V maximum

Common mode

rejection ratio (Note 1)

Thermocouple mode,

= 60 Hz)

110 dB

Voltage mode,(f

60 Hz, all input ranges)

90 dB

ADC resolution 24 bits

Crosstalk Adjacent channels 100 dB

Input coupling DC

Channel gain queue Up to 64 elements Software configurable channel and range

Warm-up time 45 minutes minimum

Open thermocouple

detect

Automatically enabled when the channel is configured for a

thermocouple sensor.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 48 49

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