Instrument Function
R&S
®
SMF100A
269
Operating Manual 1167.2319.02 ─ 12
"Pulse Generator"
Uses the pulse generator as modulation signal source.
The internal pulse generator signal is provided at the PULSE OUT
output.
●
Without option R&S
SMF-K23:
The internally generated rectangular signal is used for the pulse
modulation. The frequency of the internal signal can be set in the
LF Output menu.
●
With option R&S
SMF-K23:
If option R&S
SMF-K23 is installed, the characteristics of the gen-
erated pulse can be set in a wide range, and double pulse gener-
ation is possible. The settings are made in the "Pulse Generator"
section of the menu.
"External"
Uses an externally applied modulation signal.
The external modulation signal is input via the PULSE IN connector.
"Random"
Uses random pulses generated by the noise generator for pulse mod-
ulation.
Remote command:
Polarity
(External Source only)
Selects the polarity of the modulation signal.
"Normal"
The RF signal is
On
while the level is high at the modulation input.
"Inverted"
The RF level is ON while the level is LOW at the modulation input.
Remote command:
Synchronize to internal clock - Pulse Modulation
(External Source only)
When enabled, the external modulation signal is synchronized to the internal 200 MHz
reference before it is passed to the pulse modulator. Since most instrument capabilities
are timed by the same reference, the edges of the modulation signal can be synchron-
ized e.g. to RF or to pulse modulator outputs if instrument is set up accordingly.
When disabled, the signal is passed asynchronously to the modulator.
Remote command:
Video Polarity - Pulse Modulation
Selects the polarity of the pulse video output.
"Normal"
The video signal level is HIGH while the RF level is ON.
"Inverse"
The video signal level is LOW while the RF level is ON.
Remote command:
[:SOURce<hw>]:PULM:OUTPut:VIDeo:POLarity
Modulation
