Measurement Computing USB-TEMP-AI - Manual (Page 25)

USB-TEMP-AI User's Guide Specifications
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Settling time is defined as the time required for a channel to settle within a specified accuracy in response to a
full-scale (FS) step input.
Analog input calibration
Table 13. Analog input calibration specifications
Parameter Specifications
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 14. Throughput rate specifications
Number of Input
Channels Maximum throughput
1 2 Samples/second
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 18: 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 input/output
Table 15. 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 unless bit is configured for alarm.
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