Instrument Function
R&S
®
SMB100A
209Operating Manual 1407.0806.32 ─ 21
Ext. Impedance
(Source "External" only)
Sets the impedance for the external modulation signal, applied at the MOD EXT con-
nector.
You can select 600 Ohm or high (>100 kOhm).
This setting affects all analog modulations which use the external modulation signal.
Remote command:
[:SOURce<hw>]:INPut:MODext:IMPedance on page 347
Ignore Overvoltage Warning
Suppresses warnings the instrument generates when the modulation signal input is
overloaded.
This function prevents a warning caused by signals, that generally comply with the
specification, but temporarily overload the input, for example due to spikes. The warn-
ing is suppressed in the history, and in the error queue.
Note: This setting is not affected by an instrument preset (PRESET key), *rst or the
Save/Recall function. Only the factory preset resets (enables) this setting.
Remote command:
[:SOURce<hw>]:INPut:MODext:WIGNore on page 348
5.4.5 Pulse Modulation (PM)
The available options for performing pulse modulation include:
●
option Pulse Modulator (R&S SMB-K22)
●
option Pulse Generator (R&S SMB-K23) , comprises "Single" and "Double" pulse
generation
●
option Pulse Train (R&S SMB-K27), enables generation of pulse trains.
As modulation signal, you can either use the signal of the internal pulse generator or
an externally supplied signal. In case of external source, the external signal is input via
the PULSE EXT connector at the rear of the instrument. In case of internal source, this
connector can be used as external trigger or gate signal input for internal pulse modu-
lation. The polarity and input impedance of the connector can be selected.
The pulse signal is output at the PULSE VIDEO connector at the rear of the instru-
ment.
Modulation
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