R&S SMA100B - Source:pm Subsystem

Remote control commands
R&S
®
SMA100B
577User Manual 1178.3834.02 ─ 09
14.16.1.5 SOURce:PM subsystem
Option: R&S SMAB-K720
The PM subsystem contains the commands for setting the phase modulation. You can
configure the internal modulation source (LF generator) with the commands listed in
Chapter 14.16.6, "SOURce:LFOutput subsystem", on page 652 .
Example: Performing phase modulation
The following example shows a command sequence to perform phase modulation.
// Reset the instrument to start from an initial state
*RST; *CLS
// Set the RF signal frequency and level
SOURce:FREQuency:CW 4000000000
SOURce:POWer:LEVel:IMMediate:AMPLitude -25
// Configure the phase modulation settings
SOURce1:LFOutput1:SHAPe SINE
SOURce1:LFOutput1:FREQuency 1000
// Select the LF signal generated by the internal modulation generator
// or the internally generated noise signal
SOURce1:PM1:DEViation 1
SOURce1:PM1:SOURce LF1
// SOURce1:PM1:SOURce INTernal
// SOURce1:PM1:SOURce NOISe
SOURce1:PM1:RATio 40
SOURce1:PM1:MODE HBAN
// Alternatively configure the phase modulation settings for an
// external modulation source and query the input sensitivity.
SOURce1:PM1:SOURce EXT1
// SOURce1:PM1:SOURce EXTernal
SOURce1:PM1:DEViation 1
SOURce1:PM1:SENSitivity?
// Response: 1
// since the voltage value for full modulation is 1V,
// the resulting sensitivity is precisely 1RAD/V.
// Activate the signal output
SOURce1:PM1:STATe 1
OUTPut1:STATe 1
Example: Using combined LF signals
Using the internal LF generators of both paths, the following command sequences con-
figure an phase modulated signal with determined deviations.
SOURce subsystem