Measurement-computing USB-5201 Manual do Utilizador descarregar pdf (Página 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 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 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

±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 f

= 60 Hz 90 dB min

Common mode rejection ratio f

= 50 Hz/60 Hz 100 dB min

Resolution 24 bits

No missing codes 24 bits

Input coupling DC

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 configuration

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 from an external

application, and the configuration is made non-volatile through the use of the EEPROM.

Table 2. Channel configuration specifications

Sensor Category Conditions Specification

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

(Note 1)

8 differential channels

Note 1: The factory default configuration is Type J.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 26 27

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