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the next parameter. On the last parameter, press the Exit buttontoexittothe
menu.
7.2.1.1
ITS-90 Conversion
The ITS-90 conversion is for PRTs calibrated and characterized using the Inter
-
national Temperature Scale of 1990 equations. The parameters that appear
when ITS-90 is selected are RTPW, A4, B4, A, B, C, and D. These should be
set with the corresponding values that appear on the calibration certificate for
the PRT. The parameter RTPW takes the triple point of water resistance from
the certificate. The parameters A, B, C, and D take the an,bn, cn,anddcoeffi
-
cients from the certificate, where n is a number from 6 to 11. Parameters A4
and B4 take the a4 and b4 coefficients on the certificate. Any ITS-90 parameter
of the 1529 that does not have a corresponding coefficient on the PRT certifi
-
cate must be set to 0.
When the ITS-90 conversion type is selected, the RANGE, WIRES, and coeffi
-
cients are displayed on the right portion of the bottom of the display. The UD
buttons are used to scroll through the coefficients. Use the Enter buttontoedit
and to save the new settings. Use the LR buttons to change each digit of the
settings. Press and hold the Exit button to cancel to the main display or press
the EXIT button to cancel and to move to the next parameter. On the last pa
-
rameter, press the Exit button to exit the menu.
1529 Chub-E4 Thermometer Readout
User’s Guide
38
Probe Type Conversion Type
SPRT, PRT, RTD ITS-90 (default)
ITS-SR5
PT-100
CVD
RES (
Ω
)
Thermistor THRM R(T)
THRM T(R)
YSI-400
RES (K
Ω
)
Thermocouple TC-K (default)
VIN [mV]
TC-B
TC-E
TC-J
TC-N
TC-R
TC-S
TC-T
TC-AU/PT
Polynomial
Table 2 Conversion Types