Martel Electronics 235 - Manual (Page 11)

Menu Selection
The Model 230/235 calibrator has several functions that require
additional information once the function has been selected. The
additional information is entered by picking from a menu or list of
items. For example, when selecting the Thermocouple function, you
must pick the type of thermocouple and the temperature scale.
A detailed description of the menu is provided with each function that
has menu choices. The following general information will provide an
understanding of the operation of the menus.
The menus are composed of a title (the top line) and a list of choices
(the bottom line). The title will indicate which parameter you are
entering.
On the bottom line, one of the choices will be blinking. This indicates
the active choice and the one that will be used if you press ENT. To
select a different choice, use the INC and DEC keys. The INC key moves
the choice to the right and the DEC key moves the choice to the left. If
there are more choices than will fit on one line, the additional choices
will scroll into view as you move the selection past the rightmost
choice. When the desired choice is blinking, press ENT. If you find
yourself in a function menu by mistake, pressing CE will cancel the
menu and return the calibrator to the previous or idle state as
appropriate.
Battery Check
The BAT CK key may be pressed at any time to display the current
battery voltage for approximately 1 second before the normal display
returns. The current input and output function are not disturbed by
making a battery check measurement.
The battery voltage should be between 5.3 and 4.6 volts. When the
Operation
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