DNx-AI-208 Analog Input Layer
Chapter 1
3
Introduction
Tel: 508-921-4600
www.ueidaq.com
Vers:
4.6
Date: November 2013
File:
AI208 Chap1.fm
© Copyright 2009
United Electronic Industries, Inc.
1.2
The
DNx-AI-208
Analog Input
Layer
This manual describes the DNA-AI-208 18-bit, 8-channel, Strain Gauge Analog
Input Board/Layer. It also describes the DNA-STP-208 Screw Terminal Panel
accessory board. The technical specifications for the DNA/DNR-AI-208 Analog
Input Layer are listed in
.
Table 1-1. DNx-AI-208 Technical Specifications
Table 1-2. Offset and Gain Calibration Limits
Number of channels
8 (differential)
ADC resolution
18 bits
Sampling rate
1 S/s - 1 kS/s per channel
Input range
±10V
FIFO size
512 samples
Wiring scheme
4- and 6-wire (with Kelvin connection);
all channels share the same ground
Bridge configurations
Full-Bridge
Half-Bridge (with ext. terminal panel)
Quarter-Bridge (with ext. terminal panel)
Bridge resistance
120Ω, 350Ω, 1000Ω, and custom
Input impedance
10MΩ in parallel with 50pF
Gains
1,2,4,8,10,20,40,80,100,200,400,800
Gain accuracy
See Table 1-2.
Offset accuracy
Temperature drift
Offset drift
Gain drift
5μV/°C typ
30ppm/C° @ G=1, 45ppm/C° @ G=800
Shunt calibration
Onboard (software selectable) - 256
steps fom 5K to 205K; External
Isolation
350 Vrms
Overvoltage protection
-40V..+55V
Excitation voltage
1.5V - 10.05V (software selectable)
Excitation current
85 mA, per channel
Excitation type
Pulsing (for overheating protection)
Power consumption
bridge resistance/excitation dependent;
2.5W - 4.5W
Operating temp. (tested)
-40°C to +85°C
Operating humidity
90%, non-condensing
G
ain
±
L
S
B
±%
mV
1
2
0.000763
0.152588
2
2
0.000763
0.076294
4
4
0.001526
0.076294
8
4
0.001526
0.038147
10
4
0.001526
0.030518
20
4
0.001526
0.015259
40
6
0.002289
0.011444
80
6
0.002289
0.005722
100
6
0.002289
0.004578
200
6
0.002289
0.002289
400
10
0.003815
0.001907
800
18
0.006866
0.001717
