Measurement Computing

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USB-TEMP and USB-TC Series

Specifications

USB-TEMP/TC Specifications, continued

Accuracy

Thermocouple Measurement Accuracy

Sensor

Type

Maximum

Error

Typical

Error

Temperature

Range (°C)

J

±1.499

±0.507

–210 to 0

±0.643

±0.312

0 to 1200

K

±1.761

±0.538

–210 to 0

±0.691

±0.345

0 to 1372

S

±2.491

±0.648

–50 to 250

±1.841

±0.399

250 to 1768.1

R

±2.653

±0.650

–50 to 250

±1.070

±0.358

250 to 1768.1

B

±1.779

±0.581

250 to 700

±0.912

±0.369

700 to 1820

E

±1.471

±0.462

–200 to 0

±0.639

±0.245

0 to 1000

T

±1.717

±0.514

–200 to 0

±0.713

±0.256

0 to 600

N

±1.969

±0.502

–200 to 0

±0.769

±0.272

0 to 1300

Includes CJC measurement error.

Semiconductor Sensor Measurement Accuracy

Sensor Type

Temperature

Range (°C)

Accuracy Error

Maximum (°C)

LM35, TMP35 or equivalent

–40 to 150

±0.50

RTD Measurement Accuracy

RTD

Sensor

Temp. (°C)

Max Accuracy

Error

(Ix+ = 210 µA)

Typical Accuracy

Error

(Ix+ = 210 µA)

PT100,

DIN, US

or ITS-90

–200 to –150

±2.85 °C

±2.59 °C

–150 to –100

±1.24 °C

±0.97 °C

–100 to 0

±0.58 °C

±0.31 °C

0 to 100

±0.38 °C

±0.11 °C

100 to 300

±0.39 °C

±0.12 °C

300 to 600

±0.40 °C

±0.12 °C

Thermistor Measurement Accuracy

Thermistor

Temperature Range

(Ix+ = 10 µA)

Max Accuracy Error

(Ix+ = 10 µA)

2252 Ω

–40 °C to 120 °C

±0.05 °C

3000 Ω

–40 °C to 120 °C

±0.05 °C

5000 Ω

–35 °C to 120 °C

±0.05 °C

10000 Ω

–25 °C to 120 °C

±0.05 °C

30000 Ω

–10 °C to 120 °C

±0.05 °C

Typical Thermistor Resistance Measurement Range

Temp (°C)

Thermistor

2252 Ω

3000 Ω

5 kΩ

10 kΩ

30 kΩ

–40

76 kΩ

101 kΩ

168 kΩ

240 kΩ

885 kΩ

–35

55 kΩ

73 kΩ

121 kΩ

179 kΩ

649 kΩ

–30

40 kΩ

53 kΩ

88 kΩ

135 kΩ

481 kΩ

–25

29 kΩ

39 kΩ

65 kΩ

103 kΩ

360 kΩ

–20

22 kΩ

29 kΩ

49 kΩ

79 kΩ

271 kΩ

–15

16 kΩ

22 kΩ

36 kΩ

61 kΩ

206 kΩ

–10

12 kΩ

17 kΩ

28 kΩ

48 kΩ

158 kΩ

–5

9.5 kΩ

13 kΩ

21 kΩ

37 kΩ

122 kΩ

0

7.4 kΩ

9.8 kΩ

16 kΩ

29 kΩ

95 kΩ

Resistance values >180 kΩ cannot be measured by the device in thermistor mode.

Digital Input/Output

Digital type: 5 V CMOS

Number of I/O: 8 (DIO0 through DIO7)

Configuration: Independently configured for input or output; power on reset

is input mode

Pull-up/down configuration: All pins pulled up to 5 V through 47 kΩ resistors

Digital I/O transfer rate (software paced)

Digital input: 50 port reads or single bit reads per second typical.

Digital output: 100 port writes or single bit writes per second typical.

Input high voltage: 2.0 V min, 5.5 V absolute max

Input low voltage: 0.8 V max, –0.5 V absolute min

Output low voltage (IOL = 2.5 mA max): 0.7 V max

Output high voltage (IOH = –2.5 mA max): 3.8 V min

Power

Supply current

USB enumeration: <100 mA

Continuous mode: 140 mA typ

User 5 V input voltage range: 4.75 V min to 5.25 V max

User 5 V output voltage range: self-powered hub, 4.75 V min to 5.25 V max

User 5 V Output current: Bus-powered; connected to a self-powered hub, 10 mA max

Isolation: Measurement system to PC, 500 VDC min

Current Excitation Outputs (±Ix)

Configuration: 4 dedicated pairs

Current excitation output ranges: Thermistor 10 µA, RTD: 210 µA

Tolerance: ±5.0%

Drift: 200 ppm/°C

Line regulation: 2.1 ppm/V max

Load regulation: 0.3 ppm/V

Output compliance voltage: 3.90 V max, –0.03 V min, (relative to GND)

Environmental

Operating temperature range: 0 °C to 70 °C max

Storage temperature range: –40 °C to 85 °C max

Humidity: 0 to 90% non-condensing

Mechanical

Dimensions (L × W × H): 128.52 × 88.39 × 35.56 mm (5.06 × 3.48 × 1.43 in.)

User connection length: 3 m (9.84 ft) max