Measurement-computing WLS-TEMP Manual do Utilizador descarregar pdf (Página 23)

Chapter 5

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. Generic analog input specifications

Parameter

Condition

Specification

A/D converters

Four dual 24-bit, Sigma-Delta type

Number of channels

8 differential

Input isolation

500 VDC minimum between field wiring and

USB interface

Channel configuration

Software programmable to match sensor type

Differential input voltage

range

Thermocouple

±0.080 V

RTD

0 to 0.5 V

Thermistor

0 to 2 V

Semiconductor sensor

0 to 2.5 V

Absolute maximum input

voltage

±C0x through ±C7x relative to GND

±25 V power on

±40 V power off

Input impedance

5 GΩ, min

Input leakage current

Open thermocouple detect disabled

30 nA max

Open thermocouple detect enabled

105 nA max

Normal mode rejection ratio

=60 Hz

90 dB min

Common mode rejection

ratio

=50 Hz/60 Hz

100 dB min

Resolution

24 bits

No missing codes

24 bits

Input coupling

Warm-up time

30 minutes min

Open thermocouple detect

Automatically enabled when the channel pair is

configured for thermocouple sensor.

The maximum open detection time is 3 seconds.

CJC sensor accuracy

15 °C to 35 °C

±0.25 °C typ,±0.5 °C max

0 °C to 70 °C

–1.0 °C to +0.5 °C max

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 33 34

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