HP 3335A - Amplitude and Phase Increment Control; Setting Amplitude Increments; Phase Increment Entry

Section HI
Example:
Program an amplitude of - 23.45 dBm.
Display Result: - 23.45 dBm
NOTE
I. It is normal to hear relay operation when
the attenuator changes attenuator pads.
2. If the front panel is displaying amplitude, it
is not necessary to preface and amplitude entry
with the AMPLITUDE key.
3. With a negative amplitude displayed, depres-
sing the BACK SPACE key will cause an
ENTRY preceded by a negative sign. With this
type of amplitude entry displayed, the
“dBm” and “tdBm” entry keys will both
finalize a negative amplitude.
3-33. Amplitude Increment Entry.
3-34. Amplitude increment is used when it is desired to
manually change the amplitude by specific increments. The
desired amplitude increment is programmed by activating
the AMPTD INCR FUNCTION key, DATA keys 0 through
9 and a DATA ENTRY key, - dBm or + dBm. If an ampli-
tude increment greater than 99.99 dBm is programmed, the
display flashes indicating an illegal entry. A description of
the keys and amplitude increment display indicators
follows.
KEYS:
AMPTD INCR Key. Preface key for entering amplitude
increment. When pressed, the front panel displays the pres-
ent amplitude increment and the controller is enabled to
accept new amplitude increment data.
DATA Keys. These keys are used to enter the desired amp-
litude increment.
DATA ENTRY Keys. Used to finalize the amplitude incre-
ment entry. If an increment is programmed that exceeds
the maximum, the display flashes indicating an illegal entry.
INCR Keys. These keys are used to change the output amp-
litude by the programmed increment. By holding an INCR
key activated, the amplitude can be stepped through an
amplitude sweep.
DISPLAY INDICATORS:
AMPLITUDE INCR Indicator. Indicates the front panel is
displaying the present amplitude increment or an amplitude
increment entry.
ENTRY Indicator. Indicates the display holds an amplitude
increment entry not yet finalized by a data entry key.
3-6
Model 3335A
The numeric display indicates the amplitude increment pro-
grammed.
NOTE
Amplitude increment is actually in dB but the
dBm annunciator is used.
Example:
Program an amplitude increment of + 2.75 dBm.
Display Result: 2.75 dBm
Display
present
amplitude,
press
AMPLITUDE
FUNC-
TION
key.
Display Result: Present Amplitude display
Increment
amplitude
by
pressing
the
INCR
up
arrow.
Display
Result:
Present
amplitude
is
incremented
by
2.75
dBm.
3-35. Phase Increment Entry.
3-36. The phase increment can be used to change the out-
put phase relationship with respect to another signal by a
fixed phase increment. As an example, the 10 MHz rear
panel output and the front panel output signal have a
certain phase difference at turn-on. By phase incrementing
the output, the output signal will increase or decrease the
initial phase difference by the magnitude of the phase incre-
ment programmed. An example of using the phase incre-
ment function is illustrated in the integrated phase noise
test of Section V. The desired phase increment is program-
med by activating the @ INCR FUNCTION key, DATA
‘keys O through 9 and the deg DATA ENTRY key. An incre-
ment range of 0 degree to 360 degrees is obtainable with a
resolution of 0.1 degree. Any increment attempted greater
than 360 degrees causes the display to flash indicating an
illegal entry. A description of the keys and the @ and 9
increment displays follows.
KEYS:
@ INCR Key. Preface key for entering phase increment.
When pressed, the front panel displays the present phase
increment and the controller is enabled to accept new phase
increment data.
DATA Keys. These keys are used to enter the desired phase
increment.
DATA ENTRY Key. Used to initialize the phase increment
entry. If an increment is entered exceeding 360 degrees, the
display flashes when the ENTRY key is pressed.
DISPLAY INDICATORS:
@ INCR Indicator. Indicates the front panel is displaying
the present phase increment or a phase increment entry.