Martel Electronics 235 - Manual (Page 10)

Input/Output Selection
The Model 230/235 calibrator has a single set of function keys for
controlling both input measurements and output simulation. The input
measurement section of the calibrator is completely isolated from the
output simulation section.
To select input or output functions the INPUT and OUTPUT keys are
used. The calibrator is in output mode following power on.
Pressing the INPUT key places the calibrator in input mode, and
pressing any function key will cause the input to begin measurements
using that function.
Pressing the OUTPUT key places the calibrator in the output mode, and
pressing any function key will cause the output to request the value to
be simulated.
The current mode of the calibrator is indicated by the position of the
blinking cursor. When the calibrator is in input mode, the cursor is on
the leftmost column. When the calibrator is in output mode the cursor
is on the rightmost column.
The calibrator stays in the last mode selected until the mode is changed
by pressing the alternate key. For example, if you press INPUT and then
V, the calibrator will begin measuring volts. If you then press MV, the
input will begin measuring millivolts. If you then press OUTPUT
followed by V, the output function will respond by requesting the value
for the voltage.
Changing the input and output mode in no way affects the functions in
operation at the time. Input and output functions operate
simultaneously and without interaction. Input or output mode simply
indicates whether subsequent keystrokes will be applied to the input or
output function.
Operation
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