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TTI-7 Iss.02 – 06/11
-I
This selects the measuring current in the negative direction. Measuring time is approx. 1.8 seconds per
reading for channels A and B, and 3 seconds for A-B.
AVE
This automatically switches the measuring current from forward to reverse direction and displays the
average of the 2 readings, thus eliminating any errors due to thermal emf. Measuring time
approximately 5.2 seconds per reading for channels A and B and 10.2 seconds per reading for A-B
2
Current is reduced through the measuring probes by
2 (half power) enabling any probe self heating to
be determined. The best method of use for this option is to first allow the sensor to reach a steady
temperature and note the value; it will take some time for the sensor to stabilise. Select
2 current and
immediately press the ZERO key, the reduced current through the probe will reduce the heating effect
on the probe, and any value displayed will represent the temperature change due to the reduced
current. The advantages of using the ZERO key in this way are twofold; firstly, any errors in the
measuring amplifiers due to a change in current are removed, and secondly, from a calculation point of
view, the change in reading will be displayed without further calibration being required.
OPT
Selects the various instrument configurations. The following options are offered:
Sys Conf
displays information regarding the instrument configuration
Set Up
BACKLIGHT may be turned on/off press OK to confirm setting.
BEEPER
may be turned on/off press OK to confirm setting.
TIME
Current set time is displayed, to change press Chg and enter the new time. Hours/minutes/seconds
format is used. Press OK to confirm settings.
DATE
Current set date is displayed, to change press Chg and enter the new date Days/Month/year format
is used. Press OK to confirm settings.
REM I/F
If an interface card is fitted, pressing this key will display the various settings available to that interface
i.e. Baud rates, address etc. If no interface is fitted then a “No Option Available“ message is
displayed.
Trg:
The trigger mode can be changed; selecting Sng enables the TRIG key to be used as a single trigger.
Only one measurement will be made and held on the display. Selecting Run enables the Run/Hold
mode. Pressing the TRIG key holds the reading with the current value held on the display. Press
TRIG again and the measurement is in Run mode with continuous measurements being displayed.
Ver
Displays the Model and software versio
ns
