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Specifications
1
1-23
Table 1-4. 2635A Specifications (cont)
Thermocouple Inputs
Temperature Measurements - Accuracy (Thermocouples) (ITS-90)
Thermocouple
Accuracy (±°C)*
18°C to 28°C0°C to 60°C
Type
Temperature
(°C)
90 Days
Slow
1 Year
Slow
1 Year
Fast
1 Year
Slow
1 Year
Fast
J
-100 to -30
-30 to 150
150 to 760
0.44
0.41
0.51
0.45
0.43
0.55
0.88
0.79
0.98
0.54
0.59
0.91
1.06
1.01
1.39
K
-100 to -25
-25 to 120
120 to 1000
1000 to 1372
0.54
0.47
0.75
1.11
0.55
0.49
0.82
1.21
1.10
0.94
1.47
2.03
0.65
0.65
1.35
1.98
1.28
1.16
2.08
2.88
N
-100 to -25
-25 to 120
120 to 410
410 to 1300
0.66
0.57
0.51
0.81
0.67
0.58
0.53
0.88
1.41
1.20
1.07
1.58
0.77
0.69
0.67
1.48
1.58
1.37
1.27
2.23
E
-100 to -25
-25 to 350
350 to 650
650 to 1000
0.46
0.40
0.49
0.59
0.47
0.41
0.53
0.65
0.87
0.75
0.89
1.11
0.57
0.62
0.86
1.34
1.06
0.98
1.27
1.65
T
-150 to 0
0 to 120
120 to 400
0.70
0.48
0.40
0.72
0.49
0.43
1.45
0.93
0.78
0.82
0.60
0.63
1.67
1.11
1.02
R
250 to 400
400 to 1000
1000 to 1767
0.96
0.92
1.17
0.98
0.94
1.26
2.48
2.32
2.69
1.13
1.27
1.98
2.66
2.54
3.43
S
250 to 1000
1000 to 1400
1400 to 1767
1.01
1.03
1.32
1.03
1.09
1.41
2.61
2.45
3.06
1.39
1.61
2.17
2.80
3.00
3.85
B
600 to 1200
1200 to 1550
1550 to 1820
1.30
0.90
1.01
1.31
0.94
1.07
3.56
2.32
2.44
1.45
1.31
1.56
3.71
2.62
2.94
C
0 t 150
150 to 650
650 to 1000
1000 to 1800
1800 to 2316
0.80
0.71
0.86
1.42
2.34
0.81
0.75
0.92
1.55
2.56
1.89
1.62
1.90
3.07
4.92
0.92
1.06
1.39
2.57
4.32
2.07
1.97
2.43
4.16
6.78
* Sensor inaccuracies are not included.