Measurement Computing AI-EXP48 - Manual (Page 14)

14
Chapter 3
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Number of channels 48 single-ended/24 differential inputs
Voltage measurement speed 1 µs per channel
Input ranges, software or sequencer programmable Bipolar: ±10 V, ±5 V, ±2 V, ±1 V , ±0.5 V, ±0.2 V, ±0.1 V,
universal thermocouple
Signal to noise and distortion 72 dB typical for ±10 V range, 1 kHz fundamental
Total harmonic distortion -80 dB typical for ±10 V range, 1 kHz fundamental
Bias current 40 pA typical (0 °C to 35 °C)
Crosstalk -75 dB DC to 60 Hz; -65 dB @ 10 kHz, typical
Input impedance 10 MΩ single-ended, 20 MΩ differential
Over-voltage protection ±30 V
Accuracy
Table 2. Analog input accuracy specifications
Voltage range
(note 1) Accuracy
±(% of reading + % range)
23°C ±10 °C, 1 year Temperature coefficient
±(ppm of reading + ppm range)/°C Noise (cts
RMS) (note 2)
-10 V to 10 V 0.031% + 0.008% 14 + 8 2.0
-5 V to 5 V 0.031% + 0.009% 14 + 9 3.0
-2 V to 2 V 0.031% + 0.010% 14 + 10 2.0
-1 V to 1 V 0.031% + 0.02% 14 + 12 3.5
-500 mV to 500 mV 0.031% + 0.04% 14 + 18 5.5
-200 mV to 200 mV 0.036% + 0.05% 14 + 12 8.0
-100 mV to 100 mV 0.042% + 0.10% 14 + 18 14.0
Note 1: Specifications assume differential input single-channel scan, 1 MHz scan rate, unfiltered,
CMV=0.0 V, 30 minute warm-up, exclusive of noise, -FS to +FS.
Note 2: Noise reflects 10,000 samples at 1 MHz, typical, differential short
Thermocouples
Table 3. TC types and accuracy (Note 3)
TC type Temperature range (°C) Accuracy (±°C) Noise typical (±°C)
J -200 to + 760 1.7 0.2
K -200 to + 1200 1.8 0.2
T -200 to + 400 1.8 0.2
E -270 to + 650 1.7 0.2
R -50 to + 1768 4.8 1.5
S -50 to + 1768 4.7 1.5
N -270 to + 1300 2.7 0.3
B +300 to + 1400 3.0 1.0
Note 3: Assumes 16384 oversampling applied, CMV = 0.0V, 60 minute warm-up, still environment, and
25 °C ambient temperature; excludes thermocouple error; TC
in
= 0° C for all types except B
(1000 °C)