Chapter 5 Specifications; Analog Input - Measurement Computing USB-TC-AI User Manual

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Specifications
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

Parameter
A/D converter type
Number of channels
Input isolation
Channel configuration
Analog input modes
Input ranges
Absolute max input voltage
Input impedance
Input leakage current
Input bandwidth
(–3 dB)
Maximum working voltage
(signal + common mode)
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Table 1. Generic analog input specifications
Conditions
T0x-T3x, V0x-V3x
Voltage input V0x-V3x
Temperature input T0x-T3x
T0x-T3x
V0x-V3x
Power up and reset state
Single-ended
Differential
Thermocouple
T0x-T3x
Voltage
V0x to V3x
T0x to T3x relative to GND
V0x to V3x relative to GND
T0x to T3x
V0x to V3x
T0x to T3x, with open
thermocouple detect disabled.
T0x-T3x, with open
thermocouple detect enabled.
V0x to V3x
T0x to T3x
V0x to V3x
V0x to V3x
15
Specification
AD42_321
Dual 24-bit Sigma-Delta
4 differential, 4 single-ended
4 differential
500 VDC minimum between field wiring and USB
interface
Temperature input.
Software programmable to match sensor type
Voltage input
Factory default configuration is Disabled mode.
Once configured, each channel reverts to the mode
previously set by the user.
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.
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.
±0.080 V
±10 V, ±5 V, ±2.5 V, ±1.25 V
software selectable
±25 V max (power on)
±40 V max (power off)
±25 V max (power on)
±15 V max (power off)
5 GΩ (power on)
1MΩ (power off)
10 GΩ (power on)
2.49 kΩ (power off)
30 nA max
105 nA max
±1.5 nA typ, ±25 nA max
50 Hz
3 kHz
±10.25 V max
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Chapter 5