def get_interval_from_timebase(self, timebase, num_samples=1000):
"""Get sampling interval for given timebase.
:param timebase: timebase setting (see programmers guide for reference)
:param num_samples: number of samples required
:returns: sampling interval in nanoseconds
"""
interval = ctypes.c_float()
assert_pico_ok(
ps.ps3000aGetTimebase2(self._handle, timebase, num_samples,
ctypes.byref(interval), 1, None, 0))
return interval.value
def setTimebase(self,
postTriggerSamples=0,
preTriggerSamples=0,
timebase=2):
# Gets timebase innfomation
# Handle = chandle
# Timebase = 2 = timebase
# Nosample = maxsamples
# TimeIntervalNanoseconds = ctypes.byref(timeIntervalns)
# MaxSamples = ctypes.byref(returnedMaxSamples)
# Segement index = 0
self.timebase = timebase
self.preTriggerSamples = int(preTriggerSamples)
self.postTriggerSamples = int(postTriggerSamples)
self.maxsamples = preTriggerSamples + postTriggerSamples
self.timeIntervalns = ctypes.c_float()
self.returnedMaxSamples = ctypes.c_int16()
segment_index = 0
self.status["GetTimebase"] = ps.ps3000aGetTimebase2(
self.chandle, timebase, self.maxsamples,
ctypes.byref(self.timeIntervalns), 1,
ctypes.byref(self.returnedMaxSamples), segment_index)
assert_pico_ok(self.status["GetTimebase"])
totalSamples = preTriggerSamples + postTriggerSamples
# Gets timebase information
# handle = chandle
# timebase = 1252
# Nosample = totalSamples
# TimeIntervalNanoseconds = ctypes.byref(timeIntervalNs)
# MaxSamples = ctypes.byref(returnedMaxSamples)
# Segement index = 0
timebase = 1252
timeIntervalNs = ctypes.c_float()
returnedMaxSamples = ctypes.c_int16()
status["GetTimebase"] = ps.ps3000aGetTimebase2(chandle,
timebase,
totalSamples,
ctypes.byref(timeIntervalNs),
1,
ctypes.byref(returnedMaxSamples),
0)
assert_pico_ok(status["GetTimebase"])
# Create buffers ready for assigning pointers for data collection
bufferDPort0Max = (ctypes.c_int16 * totalSamples)()
bufferDPort0Min = (ctypes.c_int16 * totalSamples)()
# Set the data buffer location for data collection from PS3000A_DIGITAL_PORT0
# handle = chandle
# source = PS3000A_DIGITAL_PORT0 = 0x80
# Buffer max = ctypes.byref(bufferDPort0Max)
# Buffer min = ctypes.byref(bufferDPort0Min)
# Buffer length = totalSamples