HP E1419A User Manual page 336

Temperature Accuracy
Appendix A
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
•
Thermocouple Type E (0 to 800
•
Thermocouple Type EEXtended . . . . . . . . . . . . . . . . . . . . . . 340,341
•
Thermocouple Type J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342,343
•
Thermocouple Type K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
•
Thermocouple Type R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345,346
•
Thermocouple Type S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347,300
•
Thermocouple Type T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349,350
•
Reference Thermistor 5K . . . . . . . . . . . . . . . . . . . . . . . . . . . 351,352
•
Reference
RTD 100Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
•
Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354,355
RTD 100
•
Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356,357
Thermistor 2250
•
Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358,359
Thermistor 5K
•
Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360,361
Thermistor 10K
°C) . . . . . . . . . . . . . . . . . . 336,337
°C) . . . . . . . . . . . . . . . . . . . . . 338,339
Specifications 335