Fluke 1502A-156 Product Manual - Page 18

E

-04

Increase or decrease the exponent using the

U

and

D

buttons. Once the ex-

ponent is correct, press

Enter

to accept it.

6.4.3

ITS-90 PRT and Coefficients

The ITS-90 option is for PRTs calibrated and characterized using the

Interna-

tional Temperature Scale of 1990

equations. The parameters that appear

when ITS-90 is selected are “R0.01", ”A", “b”, “C”, “d”, “A4", and ”b4". These

should be set with the corresponding values that appear on the calibration cer-

tificate for the PRT. The parameter “R0.01" takes the triple point of water resis-

tance, often labeled ”Rtpw" or “R(273.16K)” on the certificate. Parameters “A”,

“b”, “C”, and “d” take the a

n

, b

n

,c

n

, and d coefficients where

n

is a number

from 5 to 11. Parameters “A4" and ”b4" take the a4 and b4 coefficients or the

a5 and b5 coefficients on the certificate.

Any ITS-90 parameter of the 1502A

that does not have a corresponding coefficient on the PRT’s certificate must

be set to 0.

The following table shows which parameter to set for each of the coefficients

that may appear on the certificate. The examples that follow demonstrate how

to set the ITS-90 parameters for certain cases. (Note: If the certificate has two

sets of coefficients, one set for “zero-power” calibration and one set for 1 mA

calibration, use the coefficients for the 1 mA calibration.)

18

Manual Rev. 952801

Hart Scientific

6

General Operation

1502A ITS-90 Coefficient

Certificate Value

A

a5, a6, a7, a8, a9, a10, or a11

b

b5, b6, b7, b8, or b9

C

c6 or c7

d

d

A4

a4 or a5

b4

b4 or b5

Table 1

Matching Certificate Values to 1502A ITS-90 Coefficients

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Section	Page
Ta ble of Con tents	3
1 In tro duc tion 1	6
2 Spec i fi ca tions and En vi ron men tal Con di tions 3	7
2.1 Spec i fi ca tions 3	7
2.2 En vi ron men tal Con di tions 4	8
2.3 War ranty 4	8
3 Safety Guide lines 7	9
4 Quick Start 9	10
4.1 Un packing 9	10
4.2 Power 9	10
4.3 Con necting the Probe 9	10
4.4 DC Power Op tion 10	11
5 Parts and Con trols 13	13
5.1 Front Panel But tons 13	13
5.2 Rear Panel 14	14
6 Gen eral Op er a tion 15	15
6.1 Se lecting Units 15	15
6.2 Pa ram e ter Menus 15	15
6.3 Menu Lock out 15	15
6.4 Se lecting the Probe Char ac ter iza tion 17	17
6.4.1 Set ting the Probe Char ac ter iza tion Type 17	17
6.4.2 Set ting the Char ac ter iza tion Co ef fi cients 17	17
6.4.3 ITS-90 PRT and Co ef fi cients 18	18
6.4.4 Callendar-Van Dusen (RTD) Con ver sion 20	20
6.4.5 IPTS-68 Con ver sion 20	20
6.4.5.1 Set ting the Char ac ter iza tion Co ef fi cients 21	21
6.4.5.2 Testing the Co ef fi cients 21	21
6.5 Fil tering 21	21
6.6 Set ting the Cur rent 22	22
6.7 Power Saver 22	22
7 Dig i tal Com mu ni ca tions In ter face 23	23
7.1 Se rial In ter face 23	23
7.1.1 Set ting the Baud Rate 24	24
7.1.2 Au to matic Trans mis sion of Mea sure ments 24	24
7.1.3 Time Stamp and Sys tem Clock 24	24
7.1.4 Du plex Mode and Line feed 25	25
7.2 GPIB In ter face 25	25
7.2.1 Set ting the Ad dress 26	26
7.2.2 Set ting the Ter mi na tion Char ac ter 26	26
7.2.3 Time Stamp 26	26
7.3 Re mote Com mands 26	26
7.3.1 Mea sure ment Com mands 26	26
7.3.1.1 Read ing Tem per a ture 28	28
7.3.1.2 Au to matically Trans mitting Mea sure ments 29	29
7.3.1.3 Se lecting the Unit of Mea sure ment 29	29
7.3.1.4 En abling the Time Stamp 29	29
7.3.1.5 Set ting the Clock 29	29
7.3.2 Probe Char ac ter iza tion Com mands 29	29
7.3.2.1 Se lecting the Char ac ter iza tion 29	29
7.3.2.2 Testing the Char ac ter iza tion 30	30
7.3.3 Sam ple Com mands 30	30
7.3.3.1 Set ting the Fil ter 30	30
7.3.3.2 Set ting the Probe Cur rent 30	30
7.3.3.3 Set ting the Power Saver 31	31
7.3.4 Com mu ni ca tion Com mands 31	31
7.3.4.1 Set ting the Du plex Mode 31	31
7.3.4.2 Set ting the Line feed Op tion 31	31
7.3.5 Cal i bra tion Com mands 31	31
7.3.5.1 En tering the Pass word 31	31
7.3.5.2 Set ting the Menu Lock out 31	31
7.3.5.3 Set ting the Cal i bra tion Co ef fi cients 32	32
7.3.5.4 Set ting the Se rial Num ber 32	32
7.3.6 Other Com mands 32	32
7.3.6.1 In stru ment Iden ti fi ca tion 32	32
7.3.6.2 Read ing a List of Com mands 32	32
8 Cal i bra tion Pro ce dure 33	33
8.1 Ac cessing the Cal i bra tion Pa ram e ters 33	33
8.2 Cal i bra tion Pro ce dure 34	34
9 Main te nance 35	35
10 Trou ble shooting 37	36

Fluke 1502A-156 Product Manual - Page 18

ITS-90 PRT and Coefficients

Page 18 highlights