R&S FSMR, Operating Manual

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CALCulate Subsystem R&S FSMR
1313.9723.12 6.1-52 E-1
CALCulate<1|2>:MARKer<1 to 4>:FUNCtion:MDEPth:RESult?
This command queries the AM modulation depth in the indicated measurement window.
A complete sweep with synchronization to sweep end must be performed between switching on the
function and querying the measured value to obtain a valid query result. This is only possible in single
sweep mode.
The numeric suffix <1 to 4> of :MARKer is irrelevant for this command.
Example:
"INIT:CONT OFF"
'Switches to single-sweep mode.
"CALC:MARK:X 10MHZ"
'Sets the reference marker (marker 1) to
'the carrier signal at 10 MHz.
"CALC:MARK:FUNC:MDEP ON"
'Switches on the modulation depth
'measurement in screen A.
"INIT;*WAI"
'Starts a sweep and waits for the end.
"CALC:MARK:FUNC:MDEP:RES?"
'Outputs the measured value of screen A.
Characteristics: *RST value: -
SCPI: device-specific
This command is only a query and therefore has no *RST value.
CALCulate<1|2>:MARKer<1 to 4>:FUNCtion:MDEPth:[:STATe]
This command switches on the measurement of the AM modulation depth. An AM-modulated carrier
is required on the screen for correct operation. If necessary, marker 1 is previously activated and set
to the largest signal available.
The level value of marker 1 is regarded as the carrier level. On activating the function, marker 2 and
marker 3 are automatically set as delta markers symetrically to the carrier to the adjacent maxima of
the trace.
If the position of delta marker 2 is changed, delta marker 3 is moved symetrically with respect to the
reference marker (marker 1). If the position of delta marker 3 is changed, fine adjustment can be
performed independently of delta marker 2.
The R&S FSMR calculates the power at the marker positions from the measured levels.
The AM modulation depth is calculated from the ratio of power values at the reference marker and
the delta markers. If the two AM sidebands differ in power, the average value of the two power
values is used for calculating the AM modulation depth.
The numeric suffix <1 to 4> of :MARKer is irrelevant with this command.
Example:
"CALC:MARK:X 10MHZ"
'Sets the reference marker (marker 1) to
'the carrier signal at 10 MHz
"
CALC:MARK:FUNC:MDEP ON"
'Switches on the modulation depth
'measurement in screen A.
"CALC:DELT2:X 10KHZ"
'Sets delta markers 2 and 3 to the signals
'at 10 kHz from the carrier signal
"CALC:DELT3:X 9.999KHZ" '
Corrects the position of delta marker 3
'relative to delta marker 2.
Characteristics: *RST value: OFF
SCPI: device-specific