Measurement-computing WLS-TC Bedienungsanleitung PDF herunterladen (Seite 18)

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

Thermocouple sensor type

Differential input voltage

range

Thermocouple

±0.080 V

Absolute maximum input

voltage

±C0x through ±C7x relative to GND

(pins 9, 19, 28, 38)

±25 V power on, ±40 V power off

Input impedance

5 GΩ, min

Input leakage current

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 sensors.

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 to +0.5 °C max

Channel configurations

Table 2. Channel configuration specifications

Sensor Category

Condition

Specification

Thermocouple

J, K, S, R, B, E, T, or N

8 differential channels

Note 1: Channel configuration information is stored in the EEPROM of the isolated microcontroller by the

firmware whenever any item is modified. Modification is performed by commands issued over USB or

wireless from an external application, and the configuration is made non-volatile through the use of the

EEPROM.

Note 2: The factory default configuration is Type J.

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