92
Agilent E1439 Programmer's Reference
Functions listed alphabetically
when
dataType
is set to
AGE1439_REAL
and there is a non-zero center frequency the data scale
value is doubled for consistent spectrum measurements
dataTypePtr
points to the current value of the
dataType
parameter.
mode
selects whether the Agilent E1439's data collection operates in block mode or continuous mode.
AGE1439_BLOCK
selects block transfer mode in which the measurement is halted after each
block of data. To start collection of the next data block the module must be armed and triggered
again. This mode is used whenever each block of data is to be associated with an individual
trigger event.
AGE1439_CONTINUOUS
means that a single arm and trigger event starts a measurement which
runs continuously with no gaps between output data blocks. The measurement continues as long
as the data is read out fast enough to prevent overflow in the output FIFO. The continuous mode is
useful for continuous signal processing applications where data gaps are unacceptable.
modePtr
points to the current value of the
mode
parameter.
port
determines which output port is used to take data from the Agilent E1439 module.
Setting
port
to
AGE1439_VME
means the data is to be output using standard VME register reads.
This is the instrument default.
Setting
port
to
AGE1439_LBUS
means the data is to be output as a byte-serial data stream via the
VXI local bus (Agilent E1439D only) . When using the local bus port the module immediately to
the right of the Agilent E1439 must be capable of receiving the local bus byte sequence.
Setting
port
to
AGE1439_FIBER
means the filtered ADC data is to be transmitted as a serial data
stream over the fiber interface.
portPtr
points to the current value of the
port
parameter.
resolution
selects data resolution of either 12 or 24 bits by using resolution values of
AGE1439_12BIT
or
AGE1439_24BIT
respectively. Choosing 12-bit precision allows for more samples in the FIFO
memory. Choosing 24 bits allows more dynamic range. Because of the broadband white noise
present on the input of the analog-to-digital converter, it is normally sufficient to use 12 bit
resolution whenever the
age1439_filter_setup
function specifies a signal bandwidth greater than
10 MHz. For narrower bandwidths much of the broadband white noise is filtered out, resulting in
lower noise in the output data. To take advantage of this lower noise, you should use the 24-bit
data resolution.
resolutionPtr
points to the current value of the
resolution
parameter.
Comments
The following table summarizes the output word or byte sequence for each combination of
dataType
,
resolution
, and
port
parameters:
Содержание E1439
Страница 6: ...6...
Страница 10: ...10 Contents...
Страница 11: ...1 1 Installing the Agilent E1439...
Страница 18: ...8 Installing the Agilent E1439 To transport the module...
Страница 19: ...2 2 Getting Started with the Agilent E1439...
Страница 28: ...18 Getting Started with the Agilent E1439 To use the example programs...
Страница 29: ...3 3 Using the Agilent E1439...
Страница 63: ...4 4 Agilent E1439 Programmer s Reference...
Страница 217: ...5 5 Module Description...
Страница 228: ...218 Module Description Block diagram and description...
Страница 229: ...6 6 Replacing Assemblies...
Страница 234: ...224 Replacing Assemblies Replaceable parts To remove the top cover...
Страница 235: ...225 Replacing Assemblies Replaceable parts To remove the M1 M2 assemblies...
Страница 236: ...226 Replacing Assemblies Replaceable parts...
Страница 238: ...228...
Страница 244: ...Index 234...