2-3
IM 2553A-01EN
Features
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App
Index
2.2 Temperature-Sensor-Simulation
Thermoelectromotive-Force and Resistance
Sourcing
For the specified temperature, the 2553A sources thermoelectromotive force and resistance that
simulate those of a thermocouple and RTD.
Thermocouple
The 2553A outputs from its output terminals the thermoelectromotive force (voltage) that corresponds
to the specified temperature according to the selected thermocouple type. The available thermocouple
types are R through A as defined by IEC and JIS standards and are listed in the following table. It is
also possible to user-define the relationship between temperature and thermoelectromotive force and
output thermoelectromotive force according to the definition.
* Since a voltage divider is used to set the different thermocouple ranges, the output resistance is
approximately 1 Ω. It is not suitable for connecting to a low-impedance load that requires current to flow
through. The output voltage will drop if such a load is connected. Connect a high-impedance load, a
load that is sufficiently larger than the output resistance. When using thermocouple ranges, do not apply
external voltage or current. Doing so may damage the voltage divider.
Type
Source Range
R
-50°C to +1768°C
S
-50°C to +1768°C
B
0°C to +1820°C
J
-210°C to +1200°C
T
-270°C to +400°C
E
-270°C to +1000°C
K
-270°C to +1300°C
N
-270°C to +1300°C
C
0°C to +2315°C
A
0°C to +2500°C
TC USER
(user-defined)
-9999.9°C to +9999.9°C
RJC Mode
The RJC mode can be set to auto, internal, or manual input. The 2553A corrects the sourced
thermoelectromotive force (RJC) according to the selected mode. It is also possible to source
thermoelectromotive force without correction.
• Auto
• When the 2553A detects that an RJ sensor is connected to the external RJ sensor input
terminal on the rear panel, the 2553A sources thermoelectromotive force that is corrected using
the temperature measured by the external RJ sensor. The 2553A can measure the terminal
temperature of the device to be calibrated that is connected to the 2553A using an RJ sensor
and source thermoelectromotive force that is corrected using the measured temperature.
• If an RJ sensor is not connected to the 2553A or is not detected, the 2553A applies its internal
RJC.
• RJ sensors 257875 are sold separately as accessories. An RTD Pt100 can also be used as an
RJ sensor.
• Internal
The 2553A sources thermoelectromotive force that is corrected using the temperature of its output
terminals.
