Maintenance
Performing a Calibration Check
7
7-17
7-16. Thermocouple Measurement Accuracy
The Thermocouple Measurement Accuracy test checks the internal temperature
reference. To perform this test, measure a lag bath temperature within + 5 °C of the
5500A. Set the 5500A to Internal Reference, J thermocouple type. (See “Setting
Temperature Simulation (Thermocouple)” in Chapter 4.) Make connections with J-type
thermocouple wire.
Nominal Value (°C) 5500A Reads (°C) Deviation °C 90-Day Spec. (°C)
Lag bath temp. 0.1
7-17. Thermocouple Sourcing Accuracy
The Thermocouple Sourcing Accuracy test checks the accuracy of the thermocouple
sourcing circuitry. For this test, measure the dc output at the 5500A front panel TC
connector with a dc meter (observe polarity on the TC connector). Select External
Reference, and the linear output 10µV/°C as the thermocouple “type.” (See “Setting
Temperature Simulation (Thermocouple)” in Chapter 4.)
Nominal Value (°C) Equivalent Value
(mV)
Measured Value
(mV)
Deviation
%
90-Day Spec.
(mV or %)
0°C 0.000 mV 0.003 mV
100°C 1.000 mV 0.305%
-100°C -1.000 mV 0.305%
1000°C 10.000 mV 0.035%
-1000°C -10.000 mV 0.035%
10000°C 100.000 mV 0.008%
-10000°C -100.000 mV 0.008%
7-18. Thermocouple Measuring Accuracy
The Thermocouple Measuring Accuracy tests the accuracy of the thermocouple
measuring circuitry. For this test, input a dc voltage into the 5500A front panel TC
terminals using copper plugs and wire (observe polarity on the TC connector), select
External Reference, and the linear output 10µV/°C as the thermocouple “type.” (See
“Setting Temperature Simulation (Thermocouple)” in Chapter 4.)
(Optional: You can also source a known temperature using a J-type thermocouple
connection and Internal Reference. Source 0°C, 100°C, 1000°C, and -200°C.)
Input Value
(V)
Nominal Reading
(°C)
Actual Reading
(mV)
Deviation %
90-Day Spec.
(mV or %)
0 V 0.00°C 0.003 mV
100 mV 10,000.00°C 0.008%
-100 mV -10,000.00°C 0.008%
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