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SECTION 3
Operation
OFFSET (DC offset)
[MODIFY] [SIZE]
The OFFSET key enables DC offset voltage pro-
gramming. The allowed offset is between -15V/
no load and 15V/no load for a DC waveform. For
other waveform types, the offset range is re-
stricted to the values specified in Table 3-l. All
specified offset ranges are for no-load condi-
tiOIlS.
FCTN (Function: waveform)
MODIFY1
This key allows you to choose the output
waveform
of the phase shifter. Available
waveforms include: DC, SIN Q
(sine wave),
2/ (triangular wave), ll- (square wave), /l (as-
cending sawtooth wave), A (descending saw-
tooth wave).
If the output range is AUTO, and the waveform
changes, p-p amplitude values are set automati-
dY*
DATA (Numeric keys for parameter entry)
The DATA key set consists of numeric keys for
entering a value and ENTER (units) keys for set-
ting 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 which 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 en-
tering 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 appropri-
ate ENTER units key to enter the units (deg, V,
etc.>.
The display will indicate the entered values and
the cursor will flash beneath the least significant
whole number. The MODIFY knob will allow
you to change the value in the column indicated,
while the cursor is flashing. After you have made
any necessary modifications, press DSPL to re-
turn to the main parameter display and begin
operation of the Model 3933A under the new set-
tings.
If, while using the DATA numeric keypad, you
enter an incorrect value, you will notice that the
cursor is not visible. This indicates the MODIFY
knob is not operational at this time.
For example, when changing PHASE, you want
to set a new phase of 124 degrees, via the DATA
keypad, but you erroneously enter "142". Since
you haven't pressed the "deg" key on the EN-
TER pad, you have several options for changing
the numeric input.
You can press the RUB OUT (delete) key. RUJ3
OUT deletes the numeric character or decimal
point from the rightmost position. Two strokes
on the RUB OTJT key will delete the Y", then the
"4", leaving the "1" next to the decimal point. At
this point, you simply enter Y", then "4", fol-
lowed by the "deg" key. The display indicates
"124 deg". Pressing DSPL completes the entry.
Keep in mind, RUB OUT only works prior to en-
tering the parameter units (V, deg, etc.).
If you have already pressed one of the ENTER
keys, you will notice that the cursor is displayed
and is blinking. You now have the option of us-
ing the MODIFY knob and the cursor movement
keys (4 and b >. Place the cursor under the value
to be changed and turn the MODIFY knob
counter-clockwise to reduce the numeric value
indicated by the cursor. A clockwise rotation will
increase the value. The amount of increase or de-
crease depends on the setting of STEP SIZE (if
applicable).
Another option is to simply press PHASE again
(or any other appropriate ENTRY key), which
will wipe out all your existing entries in the pre-
sent display (other settings - AMPTD, OFFSET,
FCTN - remain unaffected). Now, re-enter the
proper numbers, plus "deg", then DSPL.
Pressing any appropriate ENTER key will enter
the values for the MARK and SPAN waveform
cycles and phase parameters, where only one
type of unit is used. This also applies to the GPlB
address, which does not contain parameter
* units. The Model 3933A will automatically select
the appropriate unit value designation when
two unit types are identified on one keypad face.
For amplitude, where parameters can be entered
in different types of units, select the appropriate
3-8
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