Acqiris U5309A User Manual page 21

The effective maximum memory available for acquisition depends on several parameters, such as
the acquisition mode (single / multi-record / streaming), sampling rate, record size, number of
records, trigger delay, etc.... This maximum is determined by the driver for each specific
configuration. The AQMD3_ATTR_MAX_SAMPLES_PER_CHANNEL attribute in IVI-C or
IAqMD3Acquisition.MaxSamplesPerChannel property in IVI.NET can be used to retrieve
the maximum number of samples per channel that can be acquired for a specific configuration.
When using the Soft Front Panel, the Max Samples per channel parameter is given on the
Acquisition panel.
Acquisition time (Timebase range)
The timebase range defines the time period over which data is being acquired.
For example, the U5309A-M01-SR1 has a standard acquisition memory of 64 MS/ch and a maximum
sampling rate of 1 GS/s. Therefore, at the maximum sampling rate, the ADC card can record a signal
over a time window of up to 67 ms (approx 67 M samples * 1 ns/ sample).
Maximum acquisition time
There is a limit on the acquisition time / acquisition length in digitizer mode depending on the record
size, post trigger delay and binary decimation factor. Above this limit, the driver returns a post-trigger
overflow.
This limitation is given by the table below, where acquisition time = record size x sampling interval +
post-trigger delay.
Sample rate
1.00E+09
Table 2.3 - Maximum acquisition time vs. sampling rate.
U5309A User's Manual
Max acquisition time (in
seconds)
68.72
2.3 Digitizer firmware (DGT option)
21