Temperature Accuracy
The following pages have temperature accuracy graphs that include instrument
and firmware linearization errors. The linearization algorithm used is based on
the IPTS-68(78) standard transducer curves. Add your transducer accuracy to
determine total measurement error.
The thermocouple graphs on the following pages include only the errors due to
measuring the voltage output of the thermocouple, as well as the algorithm
errors due to converting the thermocouple voltage to temperature. To this error
must be added the error due to measuring the reference junction temperature
with an RTD or a 5K thermistor. See the graphs for the RTD or the 5K
thermistor to determine this additional error. Also, the errors due to gradients
across the isothermal reference must be added. If an external isothermal
reference panel is used, consult the manufacturer’s specifications. If HP
termination blocks are used as the isothermal reference, see the notes below.
NOTE
1) When using the Terminal Module as the isothermal reference, add
±
0.6
°
C
to the thermocouple accuracy specs to account for temperature gradients
across the Terminal Module. The ambient temperature of the air surrounding
the Terminal Module must be within
±
2
°
C of the temperature of the inlet
cooling air to the VXI mainframe.
2) When using the E1586 Rack-Mount Terminal Panel as the isothermal
reference, add
±
0.2
°
C to the thermocouple accuracy specs to account for
temperature gradients across the E1586. The E1586A should be mounted in
the bottom part of the rack, below and away from other heat sources for best
performance.
The temperature graphs are found on the following pages:
•
Thermocouple Type E (-200 to 800
°
C) . . . . . . . . . . . . . . . . . . . . . . Page 296-297
•
Thermocouple Type E (0 to 800
°
C). . . . . . . . . . . . . . . . . . . . . . . . . Page 298-299
•
Thermocouple Type EEXtended . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 300-301
•
Thermocouple Type J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 302-303
•
Thermocouple Type K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 304
•
Thermocouple Type R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 305-306
•
Thermocouple Type S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 307-308
•
Thermocouple Type T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 309-310
•
Reference Thermistor 5K. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 311-312
•
Reference RTD 100
Ω
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 313
•
RTD 100
Ω
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 314-315
•
Thermistor 2250
Ω
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 316-317
•
Thermistor 5K
Ω
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 318-319
•
Thermistor 10K
Ω
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 320-321
Appendix A
Specifications 295
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