2-4
IM 2553A-01EN
• Manual input
The 2553A sources thermoelectromotive force that is corrected using the manually input
temperature.
If you do not want to apply correction (not use the RJC function), you set the temperature to 0°C.
* In a thermocouple temperature measurement, the temperature is measured from the thermoelectromotive
force that is produced due to the temperature difference between the measurement point and the
other contact point. If the other contact point is 0°C, the temperature at the measurement point can be
found straight from the thermoelectromotive force. Normally, the other contact point is a terminal on a
measuring instrument, so the temperature of that terminal is measured and used for correcting the actual
measurement. This is called reference junction compensation.
RTD
The 2553A outputs from its output terminals the resistance of an RTD Pt100 that corresponds to the
specified temperature. The 2553A supports Pt100, which is defined by IEC and JIS standards. It is also
possible to user-define the relationship between temperature and resistance and output resistance
according to the definition.
Type
Source Range
Pt100
-200.0°C to +850.0°C
RTD USER
(user-defined)
-9999.9°C to +9999.9°C
Turning the Output On and Off
The output of a thermoelectromotive force or resistance that corresponds to the specified temperature
can be turned on and off.
• ON
Thermoelectromotive force or resistance is output from the output terminals. If the output is outside
the selectable range, the output cannot be turned on.
• OFF
No output is produced. If you change the thermocouple or RTD type, the output automatically turns
off.
User Definition
You can define (user-define) any thermoelectromotive force and resistance that simulate those of
thermocouples or RTDs and then source thermoelectromotive force and resistance according to the
definitions. User-defined data is created by specifying coefficients of polynomials for each temperature
range. The data that you create are written to the 2553A in the following manner.
• Write the user-defined data saved in a file to the 2553A using the USB mass storage feature.
• Transmit the user-defined data for each temperature range using communication commands. The
transmitted data is written to the 2553A.
You can assign a type character to distinguish a user definition from other user definitions. The type
character is displayed as the second character on the dot matrix LEDs for displaying the unit when a
user-defined thermoelectromotive-force or resistance source is selected.
For the user-defined data syntax and setup procedure, see appendix 4.
Temperature Unit
If the suffix code is -UC, the temperature unit is Celsius (°C). If the suffix code is -UF, you can select
Celsius (°C) or Fahrenheit (°F). You use the SETUP menu to select it.
2.2 Temperature-Sensor-Simulation Thermoelectromotive-Force and Resistance Sourcing
