Modulation - HP 8340A Operating Manual

Operating Information
DESCRIPTION
These two keys select pulse and/or amplitude modulation of the RF output, and are used in
conjunction with the front panel
3w 15). Table 1M1 (Specifications) lists all electrical parameters of these two modulation
functions.
PANEL LAYOUT
(HP-IB:
[PULSE]
the pulse modulation function. When pulse modulation is in effect, the RF output of the HP
8340A is turned on (full power selected) and off ( >80 dB attenuation) at a rate determined
by the pulse modulation input (described in Figure 3w 15). Pulse and amplitude modulation
can be in effect simultaneously (amplitude modulation is described in a following
paragraph). Press
[SHIFT] [PULSE]
[AM] (HP-IB: AMl turns on amplitude modulation, AMO turns off the function) activates
the amplitude modulation function. Amplitude modulation allows the pre-attenuated RF
output of the HP 8340A to be continuously and linearly varied between -30 dBm and the
maximum power available, at a rate determined by the
Amplitude and pulse modulation can be in effect simultaneously. Press
to turn off the function.
(HP-IB:
[SHIFT] [AM]
(automatic leveling control) bandwidth in the pulse modulation mode to reduce the settling
time of the pulses. Settling time is the typical amount of time needed for the amplitude of
the internally leveled RF pulse to come to within 10% of its final value after a change in the
pulse amplitude has been initiated. Settling time values are listed in Table 1M1. The cost for
the faster settling time obtained by
envelope, and a change of the minimum pulse repetition frequency from 100 Hz to 1 kHz.
3-28
PULSE
8)(0)
PMl turns on pulse modulation, PMO turns off the function) activates
a second time to turn off the function.
[PULSE]
has no effect on the HP 8340A.
SHAM) activates the AM function and increases the ALC
[SHIFT] [AM]
Figure 3-14.
Scans by HB9HCA and HB9FSX
.
---- - - -�---�
and BNC connectors (described in Figure
AM

MODULATION

0
0
input (described in Figure 3-15).
AM
is a slight degradation of the pulse
Modulation
Model 8340A
a second time
[AM]