U2781A Datasheet, PDF (42/76 Pages) Keysight Technologies – USB Modular Products

System accuracy specifications
The U2802A system accuracy specifications are shown in Table 1, Table 2, and Table 3. These measurements are derived
from the U2802A and DAQ input accuracy specifications without including the thermocouple error. Refer to “Calculating
System Accuracy” section in the Keysight U2802A 31-Channel Thermocouple Input Device User’s Guide for calculation
methodology.
Table 1. Measurement accuracy of the U2355A and U2356A at 23 °C ± 5 °C
Thermocouple measurement accuracy (U2355A, U2356A @ 23 °C ± 5 °C)
ITS-90 Temperature range (°C) Optimum measurement range (°C)
T/C type
Low
High
Low
High
Without
averaging
(± °C)
50 points
averaging
(± °C)
B
0
1820
1100
1820
1.9
1.2
400
1100
4.4
2.5
E
–270
1000
–150
1000
1.7
1.6
–200
–150
2.4
2.3
J
–210
1200
–150
1200
1.6
1.5
–210
–150
2.7
2.6
K
–270
1372
–100
1200
1.5
1.4
–200
–100
2.7
2.6
N
–270
1300
–100
1300
1.5
1.3
–200
–100
3.0
2.7
R
–50
1768
300
1760
2.0
1.4
–50
300
5.0
3.1
S
–50
1768
400
1760
2.1
1.6
–50
400
4.5
2.8
T
–270
400
–100
400
1.5
1.4
–200
–100
2.7
2.5
500 points
averaging
(± °C)
1.0
2.0
1.6
2.3
1.5
2.5
1.4
2.6
1.3
2.6
1.3
2.6
1.4
2.4
1.4
2.5
Table 2. Measurement accuracy of the U2355A at 0 to 18 °C and 28 to 45 °C
Thermocouple measurement accuracy (U2355A @ 0 to 18 °C and 28 to 45 °C)
T/C type ^{ITS-90 Temperature range (°C) Optimum measurement range (°C)}
Low
High
Low
High
Without
averaging
(± °C)
50 points
averaging
(± °C)
B
0
1820
1100
1820
3.4
2.4
400
1100
7.5
3.6
E
–270
1000
–150
1000
2.7
2.6
–200
–150
3.8
3.6
J
–210
1200
–150
1200
2.5
2.4
–210
–150
4.2
4.0
K
–270
1372
–100
1200
2.9
2.8
–200
–100
4.3
4.0
N
–270
1300
–100
1300
2.6
2.5
–200
–100
4.9
4.2
R
–50
1768
300
1760
3.8
3.1
–50
300
8.5
4.6
S
–50
1768
400
1760
4.2
3.4
–50
400
7.7
4.2
T
–270
400
–100
400
2.4
2.2
–200
–100
4.3
4.3
500 points
averaging
(± °C)
2.2
2.2
2.5
3.6
2.4
3.9
2.8
3.9
2.5
4.0
3.0
3.3
3.2
3.1
2.2
3.9
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