Isotech TTI-7-R, Operator'S Handbook Manual

Page: 47 / 120

5.4.8 Selecting ext. ref. junction PRT linearization whose
temperature is measured by a PRT connected to the same channel.
1. The [Ext] menu option allows you to set up an external reference
junction whose temperature is measured by a PRT connected to the
same channel. When you select
[Ext] you are prompted to choose
the PRT linearization for this PRT, the screen displays:
Standard?
IEC US/ EN-
751 JIS 751 Usr Quit OK
2. This lets you choose one of three standard linearizations which can
be used with uncalibrated probes. A fourth option,
[Usr], gives you
access to the 20 probe memories for Callendar van Dusen
coefficients provided with calibrated probes.
3. If you want to select one of the standard linearization options,
[IEC751], [US/JIS] or [EN751] , press the appropriate function key
and then [Quit]. Reference junction information is displayed at the
top right hand corner of the screen, e.g.
RJ Mode= Ext US/JIS
4. If you want to access one of the probe calibrations already in
memory, press
[Usr]. The screen displays:
Enter Probe #(1-20):
Quit OK
Use the keypad to enter the probe number and then press [Quit].
Section 5.3.5 describes how to enter user coefficients.
Operating the TTI-7-R
Page 5-13