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USB-2408 Series

Thermocouple Measurement Accuracy

TC

Type

Temp.

Range

Accuracy Error,

max

Accuracy

Error, typ

Tempco

(°C/°C)

J

–210 °C

±2.572 °C

±1.416 °C

±0.022

0 °C

±0.935 °C

±0.469 °C

1200 °C

±1.869 °C

±1.456 °C

K

–210 °C

±2.917 °C

±1.699 °C

±0.029

0 °C

±1.017 °C

±0.526 °C

1372 °C

±2.478 °C

±2.022 °C

N

–200 °C

±3.480°C

±2.030 °C

±0.029

0 °C

±1.201 °C

±0.659 °C

1300 °C

±1.991 °C

±1.600 °C

R

–50 °C

±4.826 °C

±3.133 °C

±0.082

250 °C

±2.117 °C

±1.424 °C

1768 °C

±2.842 °C

±2.347 °C

S

–50 °C

±4.510 °C

±2.930 °C

±0.089

250 °C

±2.165 °C

±1.468 °C

1768 °C

±3.187 °C

±2.597 °C

B

250 °C

±5.489 °C

±3.956 °C

±0.14

700 °C

±2.283 °C

±1.743 °C

1820 °C

±2.202 °C

±1.842 °C

E

–200 °C

±2.413 °C

±1.352 °C

±0.017

0 °C

±1.069 °C

±0.551 °C

1000 °C

±1.575 °C

±1.211 °C

T

–200 °C

±2.821 °C

±1.676 °C

±0.027

0 °C

±1.050 °C

±0.558 °C

400 °C

±0.957 °C

±0.595 °C

Includes CJC measurement error and polynomial linearization error; valid for one

year or 3000 operating hours. Each terminal block has a CJC sensor. The accuracy

listed above assumes the screw terminals are at the same temperature as the CJC

sensor. Connect thermocouples so that they float with respect to AGND.

Specifications

Input Bandwidth

A/D Data Rate (S/s)

–3 db Bandwidth (Hz)

3750

1615

2000

878

1000

441

500

221

100

44.2

60

26.5

50

22.1

25

11.1

10

4.42

5

2.21

2.5

1.1

Refer to the USB-2408 or USB-2408-2AO user’s guide for the following specifications:

- Noise performance

- Channel switching error

Throughput rate: The maximum throughput is 1.1 kS/s aggregate. The USB-2408

can set conversion rates on a per-channel basis. Refer to the hardware user’s

guide for tables and formulas for single- and multichannel throughputs.

Analog Voltage Output (USB-2408-2AO only)

Leave unused AOUTx output channels disconnected. The USB-2408-2AO output

voltage level defaults to 0 V whenever the host PC is reset, shut down or suspended,

or if a reset command is issued to the device.

The duration of the output transient depends on the enumeration process of the

host computer. The output of the USB-2408-2AO is typically stable after two seconds.

Digital to analog converter: DAC8552

Number of channels: 2

Resolution: 16 bits

Output ranges

Calibrated: ±10 V

Uncalibrated: ±10.05 V, software-selectable

Output transient

Host computer is reset, powered on, suspended or reset command issued

Duration: 2 s

Amplitude: 2 V p-p

Initial power on

Duration: 50 ms

Amplitude: 5 V peak

Differential nonlinearity: ±0.25 LSB typ, ±1 LSB max

Output current: AOUTx pins, ±5.0 mA max

Output short-circuit protection (AOUTx connected to AGND): Unlimited

duration

Output coupling: DC

Analog Input DC Voltage Measurement Accuracy

Range

Gain Error

(% of Reading)

Offset Error

INL Error

(% of Range)

Absolute

Accuracy

Gain Temperature Coefficient

(% Reading/°C)

Offset Temperature

Coefficient (µV/°C)

±10 V

±0.0037

50 µV

±0.0008

500 µV

±0.0006

3

±5 V

±0.0047

25 µV

±0.0008

300 µV

±0.0006

2

±2.5 V

±0.0059

20 µV

±0.0008

200 µV

±0.0006

1

±1.25 V

±0.0056

20 µV

±0.0008

100 µV

±0.0006

1

±0.625 V

±0.0068

15 µV

±0.0005

60 µV

±0.0006

1

±0.3125 V

±0.0104

15 µV

±0.0006

50 µV

±0.0006

1

±0.15625 V

±0.0184

10 µV

±0.0005

40 µV

±0.0006

1

±0.078125 V

±0.0384

10 µV

±0.0009

40 µV

±0.0006

1