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Service Manual
1-24
Table 1-4. 2635A Specifications (cont)
Thermocouple Inputs (cont)
Input Impedance
100 MΩ minimum in parallel with 150 pF maximum
Common Mode and Normal Mode Rejection
See Specifications, DC Voltage Inputs
Crosstalk Rejection
Refer to "Crosstalk Rejection" at the end of Table 1-3.
Open Thermocouple Detect
Small ac signal injection and detection scheme before each measurement detects greater than 1
to 4 kΩ as open. Performed on each channel unless defeated by computer command.
RTD Inputs
Type
DIN/IEC 751, 100Ω Platinum
RTD
1 Year, 4-Wire Accuracy (±°C)
Temperature Resolution 18°C to 28°C0°C to 60°C
(°C)
Slow Fast Slow Fast Slow Fast
-200.00 0.02 0.01 0.08 0.49 0.12 0.54
0.00 0.02 0.01 0.21 0.67 0.50 0.96
100.00 0.02 0.01 0.27 0.75 0.69 1.17
300.00 0.02 0.01 0.41 0.92 1.10 1.60
600.00 0.02 0.01 0.65 1.21 1.77 2.33
2-Wire Accuracy
Not specified
Maximum Current Through Sensor
1 mA
Typical Full Scale Voltage
0.22V
Maximum Open Circuit Voltage
3.2V
Maximum Sensor Temperature
600°C nominal
999.99°F is the maximum that can be displayed when using °F.
Crosstalk Rejection
Refer to "Crosstalk Rejection" at the end of this table.