Lambda SR1, Operation Manual, Page: 267 / 317

SR1 Operation 267
© 2014 Stanford Research Systems
2.8.8 IMD Panel
The IMD Quick Measurment panel sets up SR1's analyzers, generators, and displays to perform any
one of the three standard intermodulation distortion (IMD) measurements: SMPTE, CCIF, and DIM.
Cabling Configuration
The output of SR1's analog or digital generator is connected to the EUT's input. The output of the EUT is
connected to SR1's analog or digital inputs. The number of inputs and outputs and the connectors used
are specified in the
Setup Panel .
Generator Configuration
The output waveform is set to the IMD waveform of the specified type. For SMPTE measurements the
"high frequency" is set to the value entered in the panel while the low frequency defaults to 60 Hz. For
CCIF measurements the center frequency is set to the specified value while the difference frequency
defaults to 1 kHz. For DIM measurements the tone frequencies are fixed by the standard. The default
tone frequencies set up by the quick measurement can always be manually overridden on the
appropriate panel.
Analyzer Configuration
One or both analyzers (depending on the number of output channels specified in the Setup Panel ) are
configured as IMD Analyzers . The measured distortion products are selectable from the Analysis section
of the panel.
Free Run Configuration
A barchart display is created for each output channel showing the instantaneous IMD distortion of the
EUT.
Sweep Configuration
A graph will be created for each channel showing IMD vs.amplitude for the selected range of amplitudes.
Log spacing can be selected for both the frequency and amplitude sweeps. The settling parameters of
the THD+N measurement can be adjusted directly from the "Settling" tab of the panel.