Measurement-computing USB-TEMP-AI Manuale Utente Scaricare il pdf (Pagina 19)

Chapter 5

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

All specifications apply to all temperature and voltage input channels unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Generic analog input specifications

Parameter

Conditions

Specification

A/D converter type

T0x to T3x, V0x toV3x

AD42_321

Dual 24-bit Sigma-Delta

Number of channels

Voltage input; V0x toV3x

4 differential, 4 single-ended

Temperature input; T0x toT3x

4 differential

Input isolation

500 VDC minimum between field wiring and USB

interface

Channel configuration

T0x toT3x

Temperature input.

Software programmable to match sensor type

V0x toV3x

Voltage input

Analog input modes

Power up and reset state

Factory default configuration is Disabled mode.

Once configured, each channel reverts to the mode

previously set by the user.

Single-ended

Vx_H inputs are connected directly to their screw

terminal pins.

Vx_L inputs are disconnected from their screw

terminal pins and internally connected to GND.

Differential

Vx_H and Vx_L inputs are connected directly to

their screw terminal pins.

Tx_H and Tx_L inputs are connected directly to

their screw terminal pins.

Input ranges

Thermocouple; T0x toT3x

±0.080 V

RTD; T0x toT3x

0 to 0.5 V

Thermistor; T0x toT3x

0 to 2 V

Semiconductor sensor; T0x toT3x

0 to 2.5 V

Voltage; V0x toV3x

±10 V, ±5 V, ±2.5 V, ±1.25 V; software selectable

Absolute maximum input

voltage

T0x to T3x relative to GND

(pins 9, 19, 22, 27, 30, 33, 36, 39, 49)

±25 V max (power on)

±40 V max (power off)

V0x to V3x relative to GND

(pins 9, 19, 22, 27, 30, 33, 36, 39, 49)

±25 V max (power on)

±15 V max (power off)

Input impedance

T0x to T3x

5 GΩ (power on)

1 MΩ (power off)

V0x to V3x

10 GΩ (power on)

2.49 kΩ (power off)

Input leakage current

T0x to T3x, with open thermocouple

detect disabled.

30 nA max

T0x to T3x, with open thermocouple

detect enabled.

105 nA max

V0x to V3x

±1.5 nA typ, ±25 nA max

Input bandwidth (–3 dB)

T0x to T3x

50 Hz

V0x to V3x

3 kHz

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 29 30

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