Measurement-computing USB-TC-AI Uživatelský manuál stáhnout pdf (Strana 16)

USB-TC-AI User's Guide Specifications

Parameter

Conditions

Specification

Common mode rejection ratio

T0x to T3x, fIN = 60 Hz

100 dB

V0x to V3x, fIN = 60 Hz, all

input ranges

83 dB

ADC resolution

24 bits

ADC No missing codes

24 bits

Input coupling

Warm-up time

30 minutes min

Open thermocouple detect

T0x to T3x

Automatically enabled when the channel pair is

configured for thermocouple sensor.

The max open detection time is 3 seconds.

CJC sensor accuracy

T0x to T3x, 15 °C to 35 °C

±0.25 °C typ,±0.5 °C max

T0x to T3x, 0°C to 70 °C

–1.0 to +0.75 °C max

Channel configurations

Table 2. Channel configuration specifications

Channel

Category

Conditions

Specification

T0x to T3x

Disabled

All temperature input channels are disconnected from screw

terminals and internally connected to GND.

See Note 4

T0x to T3x

Thermocouple

Note 1

4 differential channels

V0x to V3x

Disabled

All voltage input channels are disconnected from screw

terminals and internally connected to GND.

See Note 4

V0x to V3x

Differential

Note 2

4 differential channels

V0x to V3x

Single-ended

4 single-ended

channels

Note 1: Internally, the USB-TC-AI has four, dual-channel, fully differential A/Ds providing a total of eight

input channels.

Note 2: When connecting differential inputs to floating input sources, you must provide a DC return path from

each differential input to ground. To do this, connect a resistor from each of the differential inputs to

GND. A value of approximately 1Meg ohm can be used for most applications.

Note 3: 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.

Note 4: The factory default configuration is Disabled. The Disabled mode will disconnect the temperature and

voltage inputs from the terminal blocks and internally connect ground (GND) to all of the A/D inputs.

Compatible sensors: T0x toT3x

Table 3. Compatible sensor type specifications

Parameter

Conditions (°C)

Thermocouple

J: –210 to 1200

K: –270 to 1372

R: –50 to 1768

S: –50 to 1768

T: –270 to 400

N: –270 to 1300

E: –270 to 1000

B: 0 to 1820

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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