Fluke 1529 Chub-E4 User Manual download pdf (Page 45)

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 24 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

Cc6,c7

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

Aa8

Bb8

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 buttontoedit

7 Menu Functions

Probe Menu

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 153 154

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Fluke 1529 Chub-E4 User Manual Page 45