3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
State Saved Yes
Annunciation When this is on, the ideal state positions are identified by graphics on the constellation diagram
Low SNR Enhancement
This parameter enhances the ability of the demodulator to lock on to signals with
low SNR. This process reduces the frequency lock range and provides additional
filtering. This filtering enables the demodulator to lock in the presence of more. To
compensate for the smaller frequency lock range, the frequency estimate is tracked
from measurement to measurement. An exponential average is used and the output
of this average becomes the starting point for the next frequency estimate for the
next measurement.
Remote Command
[:SENSe]:EVM:LSNR OFF | ON | 0 | 1
[:SENSe]:EVM:LSNR?
Example
:EVM:LSNR ON
:EVM:LSNR?
Preset OFF
State Saved Yes
Tx Frequency Offset
This control enables you to set the transmitter frequency offset. It will be subtracted
in the carrier frequency offset calculation. Set this parameter to match the Tx
frequency offset of your system.
Available only when the demodulation format is 2-FSK.
Remote Command
[:SENSe]:EVM:FSK:TXFRequency:OFFSet <frequency>
[:SENSe]:EVM:FSK:TXFRequency:OFFSet?
Example
:EVM:FSK:TXFR:OFFS 1 kHz
:EVM:FSK:TXFR:OFFS?
Dependencies If the modulation format is not 2-FSK, this control will be hidden
Preset 0.0 Hz
State Saved Yes
Min/Max -1 GHz / 1 GHz
FSK Deviation Ref
This control enables you to set the value of the FSK deviation reference when the 2-
FSK modulation format is selected.
Short Range Comms & IoT Mode User's &Programmer's Reference 285
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