Measurement-computing USB-TC Manual de usuario Pagina 15

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15
Chapter 5
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Generic analog input specifications
Condition
Specification
Four dual 24-bit, Sigma-Delta type
8 differential
500 VDC minimum between field wiring and USB
interface
Thermocouple sensor type
Thermocouple
±0.080 V
±C0x through ±C7x relative to
GND (pins 9, 19, 28, 38)
±24 V power on,
±24 V power off
5 GΩ, min
Open thermocouple detect enabled
105 nA max
f
IN
= 60 Hz
90 dB min
f
IN
= 50 Hz/60 Hz
100 dB min
24 bits
24 bits
DC
30 minutes min
Automatically enabled when the channel pair is
configured for thermocouple sensors.
The maximum open detection time is 3 seconds.
15 °C to 35 °C
±0.25 °C typ,
±0.5 °C max
0 °C to 70 °C
1.0 to +0.5 °C max
Channel configurations
Table 2. Channel configuration specifications
Condition
Specification
J, K, S, R, B, E, T, or N
8 differential channels
Note 1: Channel configuration information is stored in the EEPROM of the isolated microcontroller by the
firmware whenever any item is modified. Modification is performed by commands issued over USB
from an external application, and the configuration is made non-volatile through the use of the
EEPROM.
Note 2: The factory default configuration is Type J.
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