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National Instruments Corporation
9
SCXI-1327 Installation Guide
Cold-junction temperature-sensor circuitry
Sensor type...................................... Thermistor
Output range ................................... 1.91 to 0.65 VDC
from 0 to 50 °C
Accuracy
1
........................................ ±0.9 °C from 15 to 35 °C
±1.3 °C from 0 to 15 °C
and 35 to 50 °C
Repeatability ................................... ±0.5 °C from 15 to 35 °C
Maximum temperature gradient
between sensor and any terminal .... ±0.4 °C (non-isothermal)
High-voltage attenuator
Attenuation ratio ............................. 100:1 or 1:1 (selectable
on a per-channel basis
using slide switches)
Attenuation ratio accuracy .............. ±0.06% (for 100:1 setting)
Attenuation ratio
temperature drift ............................. 15 ppm/°C
Resistance between
CH– and CH+ terminals
1:1 attenuation setting.............. Determined by attached module
100:1 attenuation setting.......... 1 M
Ω
Coupling................................................. DC only
Current-receiver resistors ....................... Resistors not included,
resistor sockets not provided
Maximum working voltage
( common-mode)
Channel-to-ground voltage ............. Each channel to remain
within 300 V
rms
or ±300 VDC
of the ground
Channel-to-channel voltage ............ Each channel to remain
within 300 V
rms
or ±300 VDC
of the voltage applied
to any other channel
1
This includes the accuracy of the temperature sensor itself (±0.5 °C) and the temperature difference between the sensor and
any screw terminal (which may be as large as ±0.4 °C).
Summary of Contents for SCXI-1327
Page 15: ......
