2.5 Peak Detection (PKD)
34
U5303A User's Manual
RisingDelta
: defines the amount by which two consecutive samples must differ to be considered
as rising edge in the peak detection algorithm.
FallingDelta
: defines the amount by which two consecutive samples must differ to be considered
as falling edge in the peak detection algorithm.
The
RisingDelta
and
FallingDelta
are defined in ADC counts and can set up from 0 to 8191
LSB. The conversion into volts can be done as follow:
RisingDelta (Volts) = RisingDelta
ADC
x Range / 8192
or
FallingDelta (Volts) = FallingDelta
ADC
x Range / 8192
Timing sequence
The minimum time between summed events depends on the trigger
Rearm Time
as specified in the
U5303A
.
Figure 2.9 -
Timing sequence in PKD mode
Current solution supports a single sequence mode.
The number of potential trigger lost depends on several factors:
The time needed to perform the last accumulation
PKDDead Time
, which depends on the num-
ber of samples acquired (For instance,
PKD Dead Time
is 2.189 ms for an acquisition of 480
ksamples),
The time to read the previous PKD acquisition sequence, depending on the number of samples
to transfer and mainly on the PCIe connection.
The time to initiate the next acquisition.
Post trigger delay
The post-trigger delay is a multiple of 10 ns with -SR2 option, a multiple of 16 ns with -SR1 option and
a multiple of 8 ns with -SR3 option (coded in 24 bits).
The post-trigger delay can be adjusted within the following time range:
-SR3 option: from 0 to 134.217728 ms (i.e. 2
24
x 8 x 10
-9
seconds)
-SR2 option: from 0 to 167.77216 ms (i.e. 2
24
x 10 x 10
-9
seconds)
-SR1 option: from 0 to 268.435456 ms (i.e. 2
24
x 16 x 10
-9
seconds).
