Fluke THE HART 1529 - Manual (Page 43)

The RANGE parameter is used to select the appropriate resistance range. For
25 ohm and 100 ohm PRTs select 100 ohms and for 1000 ohm PRTs select 10K
ohms.
The WIRES parameter sets the appropriate number of lead wires from the sen-
sor. This parameter can be set to 2-, 3-, or 4-wires. See Figure 5 on page 22 for
the wiring configuration.
The following table shows which parameter to set for each of the coefficients
that may appear on the certificate. Note: If the certificate has two sets of coeffi-
cients, one set for “zero-power” calibration and one set for 1 mA calibration,
use the coefficients for the 1 mA calibration.)
Matching Certificate Values to the 1529 ITS-90 Coefficients
1529 ITS-90 Coefficients Certificate Value
A a6, a7, a8, a9, a10, or a11
B b6, b7, b8, or b9
C c6, c7
D d
A4 a4
B4 b4
The following example demonstrates how to set the ITS-90 parameters for the
case where a PRT was calibrated to ITS-90 and its calibration certificate states
values for coefficients Rtpw, a4, b4, a8, and b8. Set the 1529 parameters with
values from the certificate as follows.
Setting Coefficients Rtpw, a8, b8, a4, and b4
1529 ITS-90 Coefficients Certificate Value
RTPW Rtpw
A a8
B b8
C 0
D 0
A4 a4
B4 b4
7.2.1.2 ITS-SR5
The ITS-SR5 conversion is a special case of the ITS-90 conversion type. This
conversion is for the ITS-90 sub-range 5 only.
When the ITS-SR5 conversion type is selected, the RTPW, A5, and B5 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 button to edit
37
7 Menu Functions
Probe Menu