AtlasPC Digital Control, Vol. I
Manual 85586V1
64
Woodward
Common mode rejection
–80 dB minimum for analog inputs
–96 dB typical for analog inputs
–110 dB minimum for thermocouple inputs
–120 dB typical for thermocouple inputs
Input common mode range
±11 V minimum
Safe input common mode volt
±40 V minimum
Input
impedance
103
Ω
(±1%) for 4–20 mA inputs
Anti-aliasing filter
2 poles at 10 ms (channel 11 has 2 poles at 5
ms)
Resolution
15
bits
Accuracy
Thermocouple Input Accuracy @ 25
°
C (%)
T/C type
Range
< 25 °C
> 25 °C
< 300 °C
> 300 °C
Typ Max
Typ
Max
Typ
Max
Typ
Max
E or K
0.15 0.45 0.075 0.25
J
0.10 0.30 0.05 0.20
N
0.15 0.60 0.10 0.30
R or S
0.15
0.50
0.10
0.30
T
0.50 1.50 0.15 0.60
The Atlas may experience degraded performance of the
thermocouple (TC) inputs of the Analog Combo cards from ~900 MHz
to 1.1 GHz at field strengths greater than 10 V/m. Fields of 10–20 V/m
degrade the steady-state performance from a 0.25% tolerance to a
1.2% tolerance. Installation of the Atlas in a metal cabinet will
minimize this degradation.
4–20 mA Input Accuracy @ 25
°
C (%)
Input type
Typ
Max
4–20 mA
0.05 0.10
The Atlas may experience degraded performance of these 4–20 mA
inputs of the Analog Combo cards from 410 MHz to 450 MHz at field
strengths greater than 10 V/m. Fields of 10–20 V/m degrade the
steady-state performance from a 0.1% tolerance to a 0.36% tolerance.
Installation of the Atlas in a metal cabinet will minimize this
degradation.
Temperature Drift
Input Type
Full Scale
Max Drift
Degree C/C
Max Drift
µa/°C)
Max % Error
over 25 °C Delta
(% of full scale)
E
999.4 °C
0.22472989
0.56
J
1200 °C
0.29615393
0.62
K
1370 °C
0.43528413
0.79
N
1300 °C
0.46956505
0.90
R
1760 °C
1.43793547
2.04
S
1756 °C
1.62240259
2.31
T
399 °C
0.32912099
2.06
4–20 mA
25 mA
4
µA 0.40
For thermocouple inputs, the Max % Error example is calculated for a
25 °C delta using the full scale for the corresponding thermocouple
type. For the 4–20 mA inputs, the Max % Error example is calculated
for a 25 °C delta using the 25 mA full scale.
Summary of Contents for AtlasPC
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