HP 3335A - Sweep Width and Last Entry Display; Sweep Width Setting; Display Last Entry Function

Section [I]
Check the other operating parameters in register 2 by pres-
sing their respective FUNCTION key. The display should
indicate the quantities previously programmed.
Recall the operating parameters of register 3 by pressing
RECALL 3.
Result: Display indicates @INCR of 3.0 deg (@ INCR was
the parameter displayed when STORE 3 was initiated).
Check other operating parameters in register 3 as previously
done for register 2.
Display the frequency of register 2 without changing the
output frequency by pressing DISPLAY, FREQUENCY, 2.
Display Result: FREQUENCY 2 000 000. 0 ENTRY (This
frecuency can be initiated by activating a DATA ENTRY
key.)
Initiate by pressing the Hz DATA ENTRY key.
Display result: 2 000 000. 0 Hz
Recall the operating parameters of register 4 by pressing
RECALL 4.
Result: FREQUENCY 1} 000 000. 0 Hz (This is an initial
turn-on condition. The other operating parameters stored in
register 4 are also initial conditions. When a register
containing initial conditions is recalled, FREQUENCY is
displayed.)
3-41. Merging Data Into a Preset Register.
3-42. Any operating parameter stored in a PRESET register
can be changed by merging the new parameter into the
register without changing the other parameters of the
stored sets. This allows the user to change a parameter in
a PRESET register and only be concerned with the para-
meter being changed. Merging a parameter is done much
like storing a complete parameter set as described in the
preceding paragraph. The difference is the function key,
corresponding to the parameter to be merged, is pressed
prior to the register number key. Several examples of merg-
ing data follow.
EXAMPLE:
Recall from the previous examples that all parameters in
PRESET register 2 contain two’s and those in PRESET
register 3 contain three’s.
Change the frequency in PRESET register 2 to 4 MHz and
the amplitude increment of register 3 to 0.6 dBm by pres-
sing FREQUENCY, 4 MHz, STORE, FREQUENCY, 2 an
and AMPTD INCR, 0.6, + dBm, STORE AMPTD INCR, 3.
Verify these parameters have been merged by displaying
each parameter after recalling registers 2 and 3.
3-43. Recalling Data From a Preset Register.
3-44. Any operating parameter stored in a PRESET register
can be recalled individually without recalling the entire
parameter set. This allows the user to change an output
3-8
Model 3335A
parameter by recalling only that parameter from one of the
ten PRESET registers. This is done like the merging of data.
The function key, corresponding to the parameter to be
recalled, is pressed prior to the register number key. Several
examples of recalling a single parameter follow.
EXAMPLE:
Press RECALL 5.
Display Result: Display indicates a frequency of 1 MHz and
all operating parameters are initial conditions.
Recall the frequency increment of PRESET register 2 by
pressing RECALL, FREQ INCR, 2.
Display Result: Display indicates a frequency increment of
200 Hz. All other parameters are still initial conditions.
Recall the amplitude of PRESET register 3 by pressing
RECALL, AMPLITUDE, 3.
Display Result: Display indicates amplitude of + 3 dBm.
All other parameters except frequency increment are initial
conditions. Frequency increment is 200 Hz.
3-45. Display Last Entry.
3-46. The DISPLAY LAST ENTRY KEY of the FUNC-
TION group is used to recall to the display the last entry
made. It will not recall the function the entry was made in
but only the digits. If an operating parameter from one of
the ten storage registers is displayed as an entry by acti-
vating the DISPLAY key of the PRESET FUNCTION keys,
it becomes the last entry. Conversely, when the CLEAR
key is pressed, the display shows an entry of zero but this
does not constitute a last entry. This is because a display
entry cleared in error can be recalled by pressing the DIS-
PLAY LAST ENTRY key.
3-47. Sweep Width Entry.
3-48. In the sweep mode, the 3335A frequency can be
swept over a specific range. The operating frequency before
the sweep mode is the center frequency of the sweep. The
starting point of the sweep is determined by the sweep
width programmed. Half the sweep occurs below the center
frequency and half above the center frequency. The sweep
width is programmed by activating the SWEEP WIDTH
FUNCTION key, DATA keys 0 through 9 and a DATA
ENTRY key Hz, kHz or MHz. Programming a sweep width
greater than the instrument’s capability causes the display
to flash indicating an illegal sweep. A description of the
keys and the sweep width display indicators follows.
KEYS:
SWEEP WIDTH Key. Preface key for entering sweep width.
When pressed the front panel displays the present sweep
width and the controller is enabled to accept new sweep
width data.
DATA Keys. These keys are used to enter the desired sweep
width.