Giga-tronics 2500B Series Microwave Signal Generators
Modulation Operation
Operation Manual, Part Number 34737, Rev C, June 30, 2011
Page 59
PM Menus
Submenu
Parameter
Figure 29: PM Internal Gated Menu
PM Int Gated Menu
The PM Internal Gated menu allows you to view and modify the internal gated pulse
modulation mode. In this mode, the instrument’s CW signal is pulse modulated
according to the PRI and Width settings of its internal pulse modulation generator, but
appears at the RF output connector as determined by the gating signal that is applied
to the rear-panel PULSE IN/PM TRIG IN connector.
PM
Turns pulse modulation on and off. Pressing the adjacent soft key or the Step Up
or Step Down buttons toggles the PM state. The PM
indicator is displayed in the upper
right-hand corner of the display when pulse modulation is turned on
PRI
The pulse repetition interval (PRI) of the instrument’s internal pulse modulating
signal. The PRI parameter sets the duration between similar edges of the modulating
signal, and thus, the pulse repetition interval (frequency) of the pulsed RF output.
NOTE:
This parameter setting is used for the internal continuous and internal gated
pulse modulation modes; it is not set and stored separately for these modes.
Width
Sets the duration of the longest state of the modulating signal pulses, and thus,
the width of the pulses that appear at the RF output connector when an appropriate
gating signal is applied to the rear-panel PULSE IN/PM TRIG IN connector.
If the width parameter is set to a value that is more than the current PRI setting,
the PRI setting is automatically adjusted to be 20 ns greater than the Width
setting. The step size can be set in the range of 10 ns to 5 ms.
NOTE:
The same width parameter setting gets used for all three internal pulse
modulation modes (continuous, triggered, and gated); it is not set and stored
separately for each of these modes.
