Measurement Computing

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USB-2404 Series

Specifications (USB-2404-UI)

Specifications

All specifications are subject to change without notice.

Typical for the range 0 °C to 60 °C unless otherwise noted.

All voltages are relative to the CH– signal on each channel unless otherwise noted.

USB-2404-UI

Analog Input

Number Of Channels: 4

A/D Converter Resolution: 24-bit

A/D Converter Type: Delta-Sigma with analog pre-filtering

Sampling Mode: Simultaneous

TEDS Sensor Type Supported: IEEE 1451.4 TEDS Class II (interface)

Input Modes: Voltage, current, resistance (4-wire and 2-wire), RTD (3-wire and

4-wire), thermocouple, quarter-bridge, half-bridge, full-bridge

Conversion Time (No Channels in TC Mode)

High Speed: 10 ms for all channels

Best 60 Hz Rejection: 110 ms for all channels

Best 50 Hz Rejection: 130 ms for all channels

High Resolution: 500 ms for all channels

Conversion Time (One Or More Channels In TC Mode)

High Speed: 20 ms for all channels

Best 60 Hz Rejection: 120 ms for all channels

Best 50 Hz Rejection: 140 ms for all channels

High Resolution: 510 ms for all channels

Overvoltage Protection

Terminals 1 and 2: ±30 V

Terminals 3 Through 6, Across Any Combination: ±60 V

Input Impedance

Voltage Mode (±60 V, ±15 V, ±4 V): 1 M

Ω

Current Mode: <40 Ω

All Other Modes: >1 GΩ

Input Bias Current: <1 nA

Integral Non-Linearity (INL): ±15 ppm

Common Mode Rejection Ratio (ƒ

in= 60 Hz): >100 dB

Rejection: 90 dB at 60 Hz

Best 50 Hz Rejection: 80 dB at 50 Hz

High Resolution: 65 dB at 50 Hz and 60 Hz

Input Mode Ranges

Input Mode

Nominal Ranges

Actual Ranges

Voltage

±60 V, ±15 V, ±4 V,

±1 V, ±125 mV

±60 V, ±15 V, ±4 V,

±1 V, ±125 mV

Current

±25 mA

±25 mA

4- and 2-Wire

Resistance

10 kΩ, 1 kΩ

10.5 kΩ, 1.05 kΩ

Thermocouple

±125 mV

±125 mV

4- and 3-Wire RTD

Pt 1000, Pt 100

5.05 kΩ, 505 Ω

Quarter-Bridge

350 Ω, 120 Ω

390 Ω, 150 Ω

Half-Bridge

±500 mV/V

±500 mV/V

Full-Bridge

±62.5 mV/V,

±7.8 mV/V

±62.5 mV/V,

±7.8125 mV/V

Accuracy

Mode, Range

Gain Error

(% of Reading)

Offset Error

(PPM of Range)

25 ºC, ±5 ºC Typical, –40 ºC to 70 ºC

Maximum

Voltage, ±60 V

±0.3, ±0.4

±20, ±50

Voltage, ±15 V

±0.3, ±0.4

±60, ±180

Voltage, ±4 V

±0.3, ±0.4

±240, ±720

Voltage, ±1 V

±0.1, ±0.18

±15, ±45

Voltage/Thermocouple,

±125 mV

±0.1, ±0.18

±120, ±360

Current, ±25 mA

±0.1, ±0.6

±30, ±100

4- and 2-Wire* Resistance,

10 kΩ

±0.1, ±0.5

±120, ±320

4- and 2-Wire* Resistance,

1 kΩ

±0.1, ±0.5

±1200, ±3200

4- and 3-Wire RTD, Pt 1000

±0.1, ±0.5

±240, ±640

4- and 3-Wire RTD, Pt 100

±0.1, ±0.5

±2400, ±6400

Quarter-Bridge, 350 Ω

±0.1, ±0.5

±2400, ±6400

Quarter-Bridge, 120 Ω

±0.1, ±0.5

±2400, ±6400

Half-Bridge, ±500 mV/V

±0.03, ±0.07

±300, ±450

Full-Bridge, ±62.5 mV/V

±0.03, ±0.08

±300, ±1000

Full-Bridge, ±7.8 mV/V

±0.03, ±0.08

±2200, ±8000

CJC Sensor Accuracy

N/A

±1 ºC, typical

* 2-Wire resistance mode accuracy depends on the lead wire resistance. This table

assumes 0 Ω of lead wire resistance.

Stability

Measurement Conditions

Gain Drift (PPM

of Reading/ ºC)

Offset Drift

(PPM of

Range/ºC)

Voltage, ±60 V

±20

±0.2

Voltage, ±15 V

±20

±0.8

Voltage, ±4 V

±20

±3.2

Voltage, ±1 V

±10

±0.2

Voltage/Thermocouple,

±125 mV

±10

±1.6

Current, ±25 mA

±15

±0.4

4- and 2-Wire Resistance,

10 kΩ

±15

±3

4- and 2-Wire Resistance,

1 kΩ

±15

±30

4- and 3-Wire RTD,

Pt 1000

±15

±6

4- and 3-Wire RTD,

Pt 100

±15

±60

Quarter-Bridge, 350 Ω

±15

±120

Quarter-Bridge, 120 Ω

±15

±240

Half-Bridge, ±500 mV/V

±3

±20

Full-Bridge, ±62.5 mV/V

±3

±20

Full-Bridge, ±7.8 mV/V

±3

±20