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SECTION 3
Operation
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MODE
(Oscillation mode)
MODIFY]
The MODE key programs the oscillation mode set-
ting. Available oscillation modes include: CONT
(continuous oscillation), BRST (burst oscillation),
TRIG (trigger oscillation), and GATE (gate oscilla-
tion).
DATA
OVumeric keys for parameter enty)
The DATA key set consists of numeric keys for en-
tering a value and ENTER (units) keys for setting
the units of the entered value. The "." (decimal
point) key and the +/- (sign inversion) key do not
affect parameters for which they have no function.
Parameters that are selected with one numeric
character, such as waveform and oscillation mode,
do not require that any ENTER key be pressed.
Such parameters are set simply by entering one
numeric character (or by rotating the MODIFY
knob as required).
For other parameters, enter the required value
with the numeric keys, then press the appropriate
ENTER units key. If you enter the incorrect value,
press the RTJB OUT (delete) key. RTJB OUT deletes
the numeric character or decimal point from the
rightmost position. To delete the entire entered
value and return the display to the current value,
press the original function key to enable parame-
ter entry for that function.
Pressing any of the ENTER keys will enter the val-
ues for the MARK and SPACE waveform cycles
and phase parameters where only one type of unit
is used, or for the GPIB address in which case pa-
rameters contain no units.
For frequency and amplitude where parameters
can be entered in different types of units, select the
appropriate units key from the ENTER key to com-
plete entry of the value.
The units keys also have a units conversion ftmc-
tion. This feature is available for unit conversions
such as frequency-to-period
conversion for fre-
quency, as well as amplitude p-p/rms/dBV/dBm
conversions. When the units key of the unit to be
changed is pressed with the current setting dis-
played, the display will be changed to reflect the
newly selected units; note, however, that the ac-
tual outout remains unchanged.
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MODIFY
(Modify operation knob)
In addition to using the numeric keys, you can set
any parameter except the GPIB address, delimiter,
and memory number by using the MODIFY knob.
The MODIFY knob is operational when the Model
3940 is in the appropriate parameter-entry mode,
and the unit displays the current parameter value.
MODIFY (Modify knob)
When the step size is fl, you can select the digit to
increase or decrease by 1 by placin the cursor un-
der the appropriate digit (use 4 or % ) and turning
the MODIFY knob to the right or left.
When the step size is x+2, you can divide the se-
lected parameter by 2 by turning knob counter-
clockwise, or multiply the parameter by 2 by turn-
ing the knob clockwise. Similarly, when the step
size is x+10, you can divide or multiply the pa-
rameter by 10 by rotating the knob counter-clock-
wise or clockwise respectively. Note that the cur-
sor will not be displayed when the step size is x+2
or x+10.
4 Keff cursor)
This key moves the cursor to the left by one digit
each time it is pressed, and it will automatically re-
peat left cursor movement as long as it is held
down.
F (Right cursor)
This key moves the cursor to the right by one digit
each time it is pressed, and it will automatically re-
peat right cursor movement as long as it is held
down.
S'IXP SIZE (UP/DOWN step size)
STEP SIZE changes the MODIFY knob LB?/
DOWN step size. For parameters with
values
that
can be changed using variable step sizes, the step
size will change in the following order each time
this key is pressed: rtl x+2 x+10 . . .
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Miscellaneous Keys
1 - LOCAL (Refurn fo local)
LOCAL cancels remote and returns the instru-
ment to the local mode when used over the GPIB.
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