![background image](http://html1.mh-extra.com/html/omega/om-usb-tc-ai/om-usb-tc-ai_user-manual_3935172022.webp)
OM-USB-TC-AI User's Guide
Specifications
21
Analog input calibration
Table 9. Analog input calibration specifications
Parameter
Specification
Recommended warm-up time
30 minutes min
Calibration
Firmware calibration
Calibration interval
1 year
Calibration reference
+10.000 V, ±5 mV max. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C max
Long term stability: 30 ppm/1000 h
Throughput rate
Table 10. Throughput rate specifications
Number of Input Channels
Maximum throughput
1
2 S/s
2
2 S/s on each channel, 4 S/s total
3
2 S/s on each channel, 6 S/s total
4
2 S/s on each channel, 8 S/s total
5
2 S/s on each channel, 10 S/s total
6
2 S/s on each channel, 12 S/s total
7
2 S/s on each channel, 14 S/s total
8
2 S/s on each channel, 16 S/s total
Note 11:
The analog inputs are configured to run continuously. Each channel is sampled twice per second.
The maximum latency between when a sample is acquired and the voltage/temperature data is
provided by the USB unit is approximately 0.4 seconds.
Digital I/O
Table 11. Digital input/output specifications
Parameter
Specification
Digital type
5V CMOS
Number of I/O
8 (DIO0 through DIO7)
Configuration
Independently configured for input or output.
Power on reset is input mode.
Pull-up/pull-down
configuration
All pins pulled up to +5 V via 47 K resistors (default). Contact MCC factory for pull-
down to ground (GND) capability.
Digital I/O transfer rate
(software paced)
Digital input: 50 port reads or single bit reads per second typ
Digital output: 100 port writes or single bit writes per second typ
Input high voltage
2.0 V min, 5.5 V absolute max.
Input low voltage
0.8 V max, –0.5 V absolute min
Output low voltage
(IOL = 2.5 mA max)
0.7 V max
Output high voltage
(IOH = -2.5 mA max)
3.8 V min
Note 12:
All ground pins on the OM-USB-TC-AI (pins 9, 19, 22, 27, 30, 33, 36, 39, 49) are common and
are isolated from earth ground. If a connection is made to earth ground when using digital I/O and
conductive thermocouples, the thermocouples are no longer isolated. In this case, thermocouples must
not be connected to any conductive surfaces that may be referenced to earth ground.
Summary of Contents for OM-USB-TC-AI
Page 1: ......