HP 3336A Operating Manual page 30

Model 3336A/B/C
3-39. Clear Display.
3-40. The key causes the display to clear to zero. This key is useful when an error is
made entering numerical data. This key has no effect on existing programs.
3-41. Output Selection.
3-42. Pressing the key above any front panel output, activates that output port and deac-
tivates all other output ports in this group. The light in the center of these keys indicates the
active port. When the 21-60 MHz AUX Output on the rear panel is active, all front panel
outputs are deactivated. At this time, the light in the center of the Output Select key in-
dicates the front panel output port to be activated if and when the 21-60 MHz AUX Output
is deactivated. Any front panel output may be selected at any time.
NOTE
When changing from one output to another, expect a level change
relative to the different absolute amplitude ranges of each output.
(Paragraph 3-16)
3-43. Frequency Entry.
3-44. To enter frequency, press the FREQUENCY Entry key (it is not necessary to press this
key if the light in its center is lit indicating that it is already the entry function). Next, enter
the number sequence, most significant digit first, including decimal point of the desired fre-
quency and finally, press the appropriate Units key (MHz, kHz, Hz). Three units keys allow
the frequency to be entered in the most convenient form, however, the instrument always
displays the frequency in Hz.
3-45. 21-60 MHz Aux Output.
3-46. This rear panel output is activated by entering frequencies >21 MHz and deactivated
by entering frequencies below 20 MHz. The nominal rear panel output level is 0 dBm into
50 Ohms.
3-47. Level Entry.
3-48. Output levels are entered by pressing the AMPLITUDE Entry key followed by the —
key (if needed), the exact number sequence of the desired level (most significant digit first)
including decimal point and the dBm Units key.
/\ 3-49. Amplitude Leveling.
3-50. Internal Amplitude Leveling. Internal Amplitude Leveling regulates the output power
ensuring accurate output levels throughout the entire frequency range of the instrument.
The Model 3336 has two leveling modes, Normal and Fast, with different settling times. The
settling times are nominally 250 ms for the Normal mode and 1 ms for the Fast mode. At
turn-on, the instrument is in the Normal Leveling Mode and this is the operating mode that
should be used unless the advantage of faster settling time is needed. One advantage of the
Fast Leveling Mode is improved flatness. of frequency sweeps above 10 kHz.
Operation