8-Channel Thermocouple/Voltage Input USB Data Acquisition Modules

The OM-USB-TC, OM-USB-TC-AI and OM-USB-5201 are USB 2.0 full-speed thermocouple input data acquisition modules (fully compatible with both USB 1.1 and USB 2.0 ports). These are stand-alone plug-andplay modules which draw power from the USB cable (included). No external power supply is required (except for OM-USB-5201 which requires an ac adaptor). All configurable options are software programmable, and the modules are fully software calibrated.

The OM-USB-TC and OM-USB-5201 provide eight differential thermocouple input channels and have two integrated cold junction compensation (CJC) sensors for thermocouple measurements. The OM-USB-TC-AI provides eight analog input channels that are configured as four differential temperature inputs and four differential or single-ended voltage inputs. The module has one cold junction compensation (CJC) sensors for the thermocouple measurements. Thermocouples inputs are software programmable for types J, K, T, E, R, S, B and N. An open thermocouple detection feature lets you detect a broken thermocouple. An on-board microprocessor automatically linearizes the thermocouple measurement data. Voltage inputs (OM-USB-TC-AI only) are software programmable for ±10V, ±5V, ±2.5V and ±1.25V ranges. 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.

The OM-USB-5201 features eight independent temperature alarms. Each alarm controls an associated digital I/O channel as an alarm output. The input to each alarm is any one of the temperature input channels. The output of each alarm is software configurable as active high or low. The temperature threshold condition to activate each alarm is user programmable. When an alarm is activated, the associated digital I/O channel is driven to the output state. The OM-USB-5201 also has data logging capability. Measurements can be logged to a standard CompactFlash memory card (a 512 MB CompactFlash memory card is included with the OM-USB-5201). Data logging can only be done when the OM-USB-5201 is disconnected from the computer. External power is required for data logging via the included ac adaptor. User programmable settings in data logging mode include sampling interval and logging start mode (on power up, on button press or at a specified data and time).

The OM-USB-TC, OM-USB-TC-AI and OM-USB-5201 modules ship with an impressive array of software, including the new TracerDAQ®, a full-featured, out-of-the-box data logging, viewing, and analysis application. Driver support and detailed example programs are included for Universal Library programming libraries for Microsoft® Visual Studio® programming languages, and other languages, including DASYLab®, and ULx for NI LabVIEW® (comprehensive library of VIs and example programs compatible with 32-bit and 64-bit LabVIEW v8.5 through 2012) and InstaCal^TM installation, calibration and test utility-powerful solutions for programmers and nonprogrammers alike. These modules operate under Microsoft Windows® XP (32-bit only) and VISTA/7/8 (32-bit and 64-bit) operating systems.

The OM-USB-TC, OM-USB-TC-AI and OM-USB-5201 data acquisition modules are supplied with TracerDAQ software which is a collection of four virtual instrument applications used to graphically display and store input data and generate output signals:

• Strip Chart—Log and graph values acquire from analog inputs, digital inputs, temperature inputs and counter inputs
• Oscilloscope—Display values acquired from analog inputs
• Function Generator—Generate waveforms for analog outputs
• Rate Generator—Generate waveforms for counter outputs

TracerDAQ PRO is an enhanced version of TracerDAQ. A comparison of some of the features included in TracerDAQ vs TracerDAQ PRO is shown below.

SPECIFICATIONS
A/D CONVERTER
OM-USB-TC and OM-USB-5201: Four dual 24-bit sigma delta A/D converters
OM-USB-TC-AI: Dual 24-bit sigma-delta A/D converters
Input Isolation: 500 Vdc min between field wiring and USB interface
Number of Channels:
  OM-USB-TC and OM-USB-5201: 8 differential thermocouple inputs
  OM-USB-TC-AI; 4 differential thermocouple inputs and 4 differential or single-ended voltage inputs
Maximum Input Voltage: Thermocouple inputs; ±25V (power on), ±40V (power off): voltage inputs; ±25V (power on), ±15V (power off)
Input Impedance: Thermocouple inputs; 5 G? (power on), 1 M? (power off): voltage inputs; 10 G? (power on), 2.49 k? (power off)
Input Leakage Current: Thermocouples inputs; 105 nA max (with open thermocouple detection enabled), 30 nA max (with open thermocouple detection disabled): voltage inputs;
±1.5 nA typ, ±25 nA max

Maximum Working Voltage
(OM-USB-TC-AI
Voltage Inputs): ±10.25V max (input signal + common mode)
Common Mode Rejection: Thermocouple inputs, 110 dB min; voltage mode, 83 dB min
Warm-Up Time: 30 minutes max
Open Thermocouple Detection: Automatically enabled when a channel is configured for a thermocouple sensor
CJC Sensor Accuracy: ±0.25°C typical, ±0.5°C max (15 to 35°C); -1.0 to 0.75°C max (0 to 70°C)

ANALOG INPUT CALIBRATION
Recommended Warm-Up Time: 30 minutes max
Calibration: Firmware calibration
Calibration Interval: 1 year
Calibration Reference: +10.000V, ±5 mV max; actual measured values stored in EEPROM
Tempco: 5 ppm/°C max
Long Term Stability: 30 ppm/1000 hrs

DIGITAL I/O
Number of Digital I/O Channels: 8
Type: CMOS
Configuration: Each DIO bit can be independently configured for input or output;
power on reset is input mode
Pull-Up/Pull-Down Configuration: All pins pulled up to 5V via 47 k? resistors (default).
Pull-down to ground (GND) also available
Digital I/O Transfer Rate (Software Paced):
Digital Input: 50 port reads or single bit reads per second (typical)
Digital Output: 100 port writes or single bit writes per second (typical)
Input High Voltage: 2.0V min, 5.5V absolute max
Input Low Voltage: 0.8V min, -0.5V absolute min
Output High Voltage: 0.7V max (IOL = 2.5 mA)
Output Low Voltage: 3.8V min (IOH = -2.5 mA)

COUNTER
(OM-USB-TC-AI ONLY)
Number of Channels: 1
Resolution: 32-bit
Counter Type: Event counter
Input Type: TTL, rising edge triggered
Counter Read/Write Rates (Software Paced, System Dependent):
33 to 1000 read/writes per second
Schmitt Trigger Hysteresis: 20 to 100 mV
Input Leakage Current: ±1.0 uA typical
Input Frequency: 1 MHz max
High Pulse Width: 500 ns min
Low Pulse Width: 500 ns min
Input High Voltage: 4.0V min, 5.5V absolute max
Input Low Voltage: 1.0V max, -0.5V absolute min

DATA LOGGING
(OM-USB-5201 ONLY)
Memory Card Type: Compact Flash 512 MB card included: stores data for approx. 60 days when logging all 8-channels at 2 samples/sec or 150 days when logging only 1-channel at 2 samples/sec
Logging Rate: 1 sec up to 2³² seconds (1 sec intervals)
Logging Start Method: On power up, on button press or at specified date/time (user programmable)
Logging Stop Method: Button press

GENERAL
Memory: EEPROM
Microcontroller: Two high-performance 8-bit RISC microcontrollers
Power Supply Voltage (Supplied by USB Port): 4.75V min to 5.25V max
Power Supply Current (Supplied by USB Port): <100 mA typical (USB enumeration); 270 mA typical for continuous input with all inputs configured for disabled mode (500 mA for OM-USB-5201)
User 5V Output Voltage Range (connected to self-powered hub):
   OM-USB-TC/OM-USB-5201; 4.75V min to 5.25V max
   OM-USB-TC-AI; 4.9 V min to 5.1 V max
User 5V Output Current (bus powered and connected to self-powered hub):
   OM-USB-TC/OM-USB-5201; 10 mA max
   OM-USB-TC-AI; 5 mA max
Available Isolation: 500 Vdc min measurement system to PC
USB Device Type: USB 2.0 (full-speed)
Device Compatibility: USB 1.1, USB 2.0
USB Cable Length: 3 m (10') max
Dimensions: 127 L x 89 W x 36 mm H (5.0 x 3.5 x 1.4")
Input Connections: Screw terminal blocks (accept 16 to 30 AWG wire)
Operating Temperature: 0 to 50°C (32 to 122°F), 0 to 90% RH non-condensing
Storage Temperature: -40 to 85°C (-40 to 185°F)
Weight:
   OM-USB-TC and OM-USB-TC-AI: 182 g (6.4 oz)
  OM-USB-5201: 227 g (8.0 oz)