USB-TC USB-based 8-channel thermocouple input module. Measurement Computing

Description

USB card with 8 inputs for thermocouples (J / K / R / S / T / N / E / B) and 8 configurable digital I / O. Includes USB cable and software for monitoring.
The USB-TC is a USB 2.0 full-speed, thermocouple input module that is supported under popular Microsoft® Windows® operating systems. The USB-TC is fully compatible with both USB 1.1 and USB 2.0 ports. The USB-TC provides eight differential thermocouple input channels. Eight independent, TTL-compatible digital I/O channels are provided to monitor TTL-level inputs, communicate with external devices, and to generate alarms. The digital I/O channels are software programmable for input or output. With the USB-TC, you can take measurements from type J, K, R, S, T, N, E, and B thermocouples. The USB-TC provides two integrated cold junction compensation (CJC) sensors for thermocouple measurements. An open thermocouple detection feature lets you detect a broken thermocouple. An on-board microprocessor automatically linearizes the measurement data. The USB-TC is a standalone plug-and-play module which draws power from the USB cable. No external power supply is required. All configurable options are software programmable. The USB-TC is fully software calibrated.
Features:
Temperature and voltage measurements
Measure temperature from type J, K, R, S, T, N, E, and B thermocouples
8 analog inputs
24-bit resolution
8 digital I/O
1 event counter
SPECIFICATIONS
Parameter
Conditions
Specification
A/D converters
Four dual 24-bit, Sigma-Delta type
Number of channels
8 differential
Input isolation
500 VDC minimum between field wiring and USBinterface
Channel configuration
Thermocouple sensor type
Differential input voltage range
Thermocouple
±0.080 V
Absolute maximum input voltage
±C0x through ±C7x relative to GND (pins 9, 19, 28, 38)
±24 V power on,
±24 V power off
Input impedance
5 G?, min
Input leakage current
Open thermocouple detect enabled
105 nA max
Normal mode rejection ratio
fIN = 60 Hz
90 dB min
Common mode rejection ratio
fIN = 50 Hz/60 Hz
100 dB min
Resolution
24 bits
No missing codes
24 bits
Input coupling
DC
Warm-up time
30 minutes min
Open thermocouple detect
Automatically enabled when the channel pair is configured for thermocouple sensors. The maximum open detection time is 3 seconds.
CJC sensor accuracy
15 °C to 35 °C
0 °C to 70 °C
±0.25 °C typ,
±0.5 °C max
–1.0 °C to +0.5 °C max