Measurement-computing USB-2001-TC Manual do Utilizador descarregar pdf (Página 12)

Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Caution! Electromagnetic interference can adversely affect the measurement accuracy of this product. The

input terminals of this device are not protected for electromagnetic interference. As a result, this

device may experience reduced measurement accuracy or other temporary performance

degradation when connected cables are routed in an environment with radiated or conducted radio

frequency electromagnetic interference. To limit radiated emissions and to ensure that this device

functions within specifications in its operational electromagnetic environment, take precautions

when designing, selecting, and installing measurement probes and cables.

Analog input

Table 1. Input characteristics

Parameter

Conditions

Specification

Number of channels

One

ADC resolution

20 bits

Input ranges

±73.125 mV, calibrated

±146.25 mV, not calibrated. Used for open

thermocouple detection.

Common-mode range

Channel-to-USB ground

±30 V

Common-mode rejection ratio

(0 to 60 Hz)

Channel-to-USB ground

>145 dB

Noise rejection

50/60 Hz

>80 dB

Temperature measurement

ranges

Works over temperature ranges defined by NIST (J,

K, R, S, T, N, E, and B thermocouple types.) The E

type has a maximum limit of 900 ºC.

Conversion time

250 ms

Input bandwidth

–3 dB

1 Hz

Differential input impedance

20 MΩ between isolated 3.3 V and ground

Input noise

2 µVpp

Open thermocouple bias voltage

3.3 V

Cold-junction compensation

sensor accuracy

0 to 65 ºC

1.25 °C maximum, 0.6 °C typical

Cold-junction compensation

sensor resolution

0.0625 °C typical

Overvoltage protection

30 V max between TC+ and TC–

Channel configurations

Table 2. Channel configuration specifications

Sensor category

Conditions

Specification

Thermocouple (Note 2)

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

One differential channel

Note 1: Channel configuration information is stored in internal FLASH Program Memory on the

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 non-volatile.

Note 2: The factory default configuration is undefined ‘#’.

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