Measurement-computing WEB-TC Uživatelský manuál stáhnout pdf (Strana 28)

Chapter 6

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Generic analog input specifications

Parameter

Conditions

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

power supply input.

Channel configuration

Software programmable to match sensor type

Differential input voltage

range

Thermocouple

±0.080 V

Absolute maximum input

voltage

±C0x through ±C7x relative to

AGND (pins 9, 19, 28, 38)

±25 V (power on)

±40 V (power off)

Input impedance

5 Gigohm (power on)

1 Mohm (power off)

Input leakage current

Open thermocouple detect disabled

30 nA max.

Open thermocouple detect enabled

105 nA max.

Common mode rejection ratio

= 60 Hz

100 dB min.

ADC Resolution

24 bits

ADC No missing codes

24 bits

Input coupling

Warm-up time

30 minutes min.

Open thermocouple detect

The maximum open detection time is 3 seconds.

CJC sensor accuracy

15 °C to 35 °C

-0.75 °C to 0.5 °C max.

0 °C to 55 °C

-1.5 °C to 1.25 °C max.

Channel configurations

Table 2. Channel configuration specifications

Sensor Category

Conditions

Specification

Thermocouple

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

8 differential channels

Note 1: Channel configuration information is stored on a EEPROM external to the isolated microcontroller by

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

Ethernet 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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