App-6
IM 2560A-01EN
When Using an External Reference Junction Compensation
Wiring Example
When Connecting an RJ Sensor Directly to the Device to Be Calibrated
Thermometer, data
logger, and the like that
support thermocouple
input
2560A
Copper wires
Connect the measurement section of
the RJ sensor to the input terminal
of the device to be calibrated.
When Connecting an RJ Sensor to a Relay Terminal Block
Thermometer, data
logger, and the like that
support thermocouple
input
2560A
Copper wire
Connect the measurement
section of the RJ sensor to the
relay terminal block.
Off-the-shelf relay terminal block
Thermocouple wires
or
compensating lead
wires
If the measurement section of an RJ sensor is connected to the input terminals of the device to
be calibrated and the temperature of the terminals is different from the ambient temperature, the
temperature imbalance will cause the temperature of the terminals to change. This may prevent
accurate reference junction compensation. In such a situation, use a relay terminal block that is
at the same temperature as the ambient temperature. However, you will need a thermocouple or
compensating lead wire.
Configuring the 2560A
1.
Connect an external reference junction (RJ) sensor to the external RJ sensor input terminal on
the rear panel.
• For the wiring details, see section 3.6.
• Connect the measurement section of the external RJ sensor to the input terminal or relay terminal block
of the device to be calibrated.
2.
Set the reference junction compensation mode to AUTO.
• For details on 2560A configuration, see section 6.6.
3.
Set the thermocouple type, temperature, and the like, and calibrate.
• For details on 2560A configuration, see sections 6.1 to 6.4.
• Reference junction compensation error is added to the thermocouple temperature source accuracy.
Appendix 3 Thermocouple Calibration Wiring Examples
