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6 General Operation
This section explains basic operation of the 1504 Thermometer.
6.1 Selecting Units
Temperature can be displayed in degrees Celsius (indicated with “C”), degrees
Fahrenheit (indicated with “F”), or Kelvin (indicated with “A” for absolute).
The resistance of the sensor can also be displayed (indicated with “o”for
ohms). Simply press the appropriate unit button, C, F, K,orΩ to select the
units.
6.2 Parameter Menus
Except for unit selection, all functions and operating parameters are accessed
and edited within the parameter menus. There are four menus: the Probe pa
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rameter menu, Sample parameter menu, Comm (communication) parameter
menu, and Cal (calibration) parameter menu. The arrangement of parameters in
the menus is shown in Figure 5 on page 18.
Menus are selected by pressing the Menu/Enter button followed by the appro-
priate menu selection button. The name of the menu will briefly appear on the
display. For example, the Probe menu is selected by pressing the Menu/Enter
button (“SEt?” appears on the display) followed by the C/Probe button
(“ProbE” appears). Selecting the Cal menu requires that you press the
Menu/Enter button then press the Ω/Exit button and hold it down for at least
one second.
The Probe menu contains parameters for selecting the probe characterization
and setting the characterization coefficients. These parameters are explained in
Section6.4.TheSample menu contains parameters for setting the filter. This is
explained in Sections6.5.TheComm menu contains communication parame
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ters such as the serial baud rate or IEEE-488 address. These are explained in
Sections7.1 and7.2.TheCal menu contains the calibration parameters. These
are explained in Section8.1.
6.3 Menu Lockout
All menus can be locked out to prevent inadvertently changing parameters. By
default, only the Cal menu is locked out. The lockout option is accessed in the
Cal menu (see Section8.1 “Accessing the Calibration Parameters”).
If menus are locked out you must enter the correct password (“4051”) to gain
access. After you select the menu (see the previous section) the display will
show “PA= 0000” and allow you to change the number to the correct pass
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word. Use the L and R buttons to move between the password digits and
the U and D buttons to increase or decrease the value of a digit. Press Enter
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6 General Operation
Selecting Units