Fluke 1502A-156 Product Manual - Page 17

6.4

Selecting the Probe Characterization

Before the 1502A can measure temperature accurately it must know how to

calculate temperature from the resistance of the sensor. You must select a

conversion type and enter the proper characterization coefficients. There are

several temperature conversion algorithms available. The one to use depends

on the type of probe you are using and its calibration. The conversion algo-

rithms use coefficients that characterize the sensor. Coefficients are deter-

mined when the probe is calibrated. SPRTs and PRTs often use the ITS-90

algorithms and are provided with ITS-90 characterization coefficients.

6.4.1

Setting the Probe Characterization Type

The probe characterization type and characterization coefficients are set in the

Probe

menu. Press the

Menu

button (“

SEt?

” appears), then the

C/Probe

but-

ton. The menu name, “

ProbE

”, will appear briefly then the characterization

type. The probe characterization types are indicated on the display as follows:

Pr=

t90

ITS-90

Pr=

rtd

Callendar-Van Dusen

Pr=

t68

IPTS-68

Select the desired probe characterization type using the

U

and

D

buttons

and pressing the

Enter

button. After the characterization type is selected the

characterization coefficients follow. The coefficients that appear depend on the

probe type that was selected.

6.4.2

Setting the Characterization Coefficients

Probe characterization coefficients are set within the

Probe

menu after select-

ing the probe characterization type. Each coefficient appears with the name of

a coefficient shown briefly followed by its value. For example,

A4

+4.336079

For some coefficients, you only need to set the digits in the number. Other co-

efficients also have a sign as shown above (positive sign appears as “

+

”). Use

the

L

and

R

buttons to move between the digits (and the sign). The se-

lected digit will flash. Use the

U

and

D

buttons to change a digit. Once the

sign and digits are correct, press

Enter

to accept the number. If you decide to

cancel any changes you have made, you may do so by pressing the

Ω

/

Exit

button. This will immediately skip to the next coefficient.

If the coefficient also requires an exponent, it will appear after setting the num-

ber as follows:

1502A

Manual Rev. 952801

17

6

General Operation

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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 17

Selecting the Probe Characterization

Page 17 highlights