![background image](http://html1.mh-extra.com/html/omega/om-usb-tc-ai/om-usb-tc-ai_user-manual_3935172018.webp)
17
Chapter 5
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
Table 1. Generic analog input specifications
Parameter
Conditions
Specification
A/D converter type
T0x-T3x, V0x-V3x
AD42_321
Dual 24-bit Sigma-Delta
Number of channels
Voltage input V0x-V3x
4 differential, 4 single-ended
Temperature input T0x-T3x
4 differential
Input isolation
500 VDC minimum between field wiring and USB
interface
Channel configuration
T0x-T3x
Temperature input.
Software programmable to match sensor type
V0x-V3x
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-T3x
±0.080 V
Voltage
V0x to V3x
±10 V, ±5 V, ±2.5 V, ±1.25 V
software selectable
Absolute max input voltage
T0x
to
T3x relative to GND
±25 V max (power on)
±40 V max (power off)
V0x to
V3x relative to GND
±25 V max (power on)
±15 V max (power off)
Input impedance
T0x to
T3x
5 GΩ (power on)
1MΩ
(power off)
V0x to
V3x
10 GΩ (power on)
2.49 k
Ω (power off)
Input leakage current
T0x to
T3x, with open
thermocouple detect disabled.
30 nA max
T0x
-
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
Maximum working voltage
( common mode)
V0x to V3x
±10.25 V max
Содержание OM-USB-TC-AI
Страница 1: ......