Measurement-computing USB-2408 Series Uživatelský manuál stáhnout pdf (Strana 21)

Chapter 4

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 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 S/s to 1102.94 S/s (software-selectable)

 Multiple channels: 0.16 S/s to 551.47 S/s (software-selectable)

See Table 11 and Table 12 for details.

Number of channels

16 single-ended or 8 differential (software-selectable).

Thermocouples require differential mode. For each channel

configured as differential, you essentially lose two single-ended

channels.

Input isolation

500 VDC min between field wiring and USB interface

Channel configurations

Temperature sensor input, software-selectable to match sensor

type

Voltage input

Input voltage range

Thermocouple mode

±0.078125 V

Voltage mode (Note 1)

±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,

±0.15625 V, ±0.078125 V (software-selectable)

Absolute maximum input

voltage

CxH-CxL relative to

GND

 ±22 V max (power on)

 ±10 V max (power off)

Input impedance

 10 MΩ (power on)

 390 Ω (power off)

Input leakage current

±20 nA

Input voltage >±30 V

(power on/off)

±1 µA max

Input capacitance

590 pf

Maximum working

voltage (signal + common

mode)

Voltage mode

±10.25 V max

Common mode rejection

ratio (Note 1)

Thermocouple mode,

= 60 Hz)

110 dB

Voltage mode,

= 60 Hz, all input

ranges)

90 dB

ADC resolution

24 bits

Crosstalk

Adj chan, DIFF mode

100 dB

Input coupling

Channel gain queue

Up to 64 elements

Software-selectable channel and range

Warm-up time

45 minutes min

Open thermocouple detect

Software-selectable for each channel.

CJC sensor accuracy

15 °C to 35 °C

±0.5 °C typ

0 °C to 55 °C

±1.0 °C max

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 33 34

Komentáře k této Příručce

Žádné komentáře

Measurement-computing USB-2408 Series Uživatelský manuál Strana 21

Komentáře k této Příručce

Související produkty a manuály pro Hardware Measurement-computing USB-2408 Series