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OM-USB-TC-AI User's Guide
Analog input calibration
Parameter
Recommended warm-up time
Calibration
Calibration interval
Calibration reference
Throughput rate
Number of Input Channels
1
2
3
4
5
6
7
8
The analog inputs are configured to run continuously. Each channel is sampled twice per second.
Note 11:
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
Parameter
Digital type
Number of I/O
Configuration
Pull-up/pull-down
configuration
Digital I/O transfer rate
(software paced)
Input high voltage
Input low voltage
Output low voltage
(IOL = 2.5 mA max)
Output high voltage
(IOH = -2.5 mA max)
All ground pins on the OM-USB-TC-AI (pins 9, 19, 22, 27, 30, 33, 36, 39, 49) are common and
Note 12:
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.
Table 9. Analog input calibration specifications
Specification
30 minutes min
Firmware calibration
1 year
+10.000 V, ±5 mV max. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C max
Long term stability: 30 ppm/1000 h
Table 10. Throughput rate specifications
Maximum throughput
2 S/s
2 S/s on each channel, 4 S/s total
2 S/s on each channel, 6 S/s total
2 S/s on each channel, 8 S/s total
2 S/s on each channel, 10 S/s total
2 S/s on each channel, 12 S/s total
2 S/s on each channel, 14 S/s total
2 S/s on each channel, 16 S/s total
Table 11. Digital input/output specifications
Specification
5V CMOS
8 (DIO0 through DIO7)
Independently configured for input or output.
Power on reset is input mode.
All pins pulled up to +5 V via 47 K resistors (default). Contact MCC factory for pull-
down to ground (GND) capability.
Digital input: 50 port reads or single bit reads per second typ
Digital output: 100 port writes or single bit writes per second typ
2.0 V min, 5.5 V absolute max.
0.8 V max, –0.5 V absolute min
0.7 V max
3.8 V min
21
Specifications
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