Agilent Technologies 93000 SOC Series Training Manual page 358

Lesson 5 – Executing the ADC Distortion Test
M : Synchronous or asynchronous.
•
ODE
R : Specify the resolution of the ADC as number of bits.
•
ESOLUTION
Synchronous mode means synchronized start of AWG and digital
waveform capturing. The delay between the AWG trigger pulse and
the waveform start must be specified with the Analog Setup Tool.
Asynchronous mode does not care about setup delays. This mode
can be used to capture a certain number of data points of a
waveform that is repeated.
F : Data format, such as binary or 2's complement. Supports
•
ORMAT
also special formats.
M : Can be normal or complementary (inverted).
•
ODE
O : If you specify an offset of N the first N samples of the
•
FFSET
captured data will be discarded. Note that this offset is in addition
to the initial discard defined in the vector variable.
# : Specifies the total number of data points (captured samples)
•
PTS
to be used for the result evaluation.
F : Enter the sampling frequency.
•
REQ
D : This is the frequency range of the FFT results that
•
ISTORTION BW
is passed to the distortion calculation.
# : The number of harmonics to be used in the distortion
•
HARMS
parameter calculations (THD).
# : Enter the number of cycles in the captured waveform. As
•
CYCLS
the number of data points to be captured is even (2
of cycles should be odd in order to support coherent sampling.
F lets you define a larger part (more than one frequency
•
UNDWIDTH
bin) of the spectrum as part is the fundamental. Normally, the
fundwidth is set to 1 (one frequency bin), but it can be set to a
higher odd integer value (3, 5, 7, ...), if required.
Datalog
The D section provides checkboxes which allow to control
ATALOG
the storage of captured and calculated waveforms in the Event
Datalog file.
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n
), the number