def prepare_waveform(self,
seq_setpoints=None,
seq_name=None,
seq_label=None,
seq_unit=None):
"""
Prepare the scope for returning waveform data
"""
# To calculate set points, we must have the full preamble
# For the instrument to return the full preamble, the channel
# in question must be displayed
# shorthand
instr = self._instrument
# acquire waveform description
instr.write("{}:WF? DESC".format(self._channel_id))
wavedesc = instr._parent._read_ieee_block()
# extract Time setpoints info
self.Nsamples, = struct.unpack_from('l', wavedesc, 116)
self.Nseqs, = struct.unpack_from('l', wavedesc, 144)
self.horz_dt, self.horz_offset = struct.unpack_from(
'fd', wavedesc, 176)
self.Npts = int(self.Nsamples / self.Nseqs)
self.time_setpoints = tuple(self.horz_offset +
self.horz_dt * np.arange(self.Npts))
# set setpoints info
if ((seq_setpoints is not None)
and (len(seq_setpoints) != self.Nseqs)):
raise ValueError('Length of seq_setpoints {} does \
not match number of sequences {}'.format(
len(seq_setpoints), self.Nseqs))
self.seq_setpoints = (tuple(seq_setpoints) if seq_setpoints else tuple(
range(self.Nseqs)))
if seq_name is not None:
self.setpoint_names = (seq_name, 'Time')
if seq_unit is not None:
self.setpoint_units = (seq_unit, 's')
if seq_label is not None:
self.setpoint_labels = (seq_label,
f'{self._channel_id} time series')
self.setpoints = setpoint_generator(self.seq_setpoints,
self.time_setpoints)
self.shape = (self.Nseqs, self.Npts)
# make this on a per channel basis?
self._instrument._parent.trace_ready = True
def __init__(self, name, instrument):
self.start = 0
self.stop = 2e6
self.npts = (100, 50, 20)
sp1 = np.linspace(self.start, self.stop, self.npts[0])
sp2 = np.linspace(self.start, self.stop, self.npts[1])
sp3 = np.linspace(self.start, self.stop, self.npts[2])
setpoints = setpoint_generator(sp1, sp2, sp3)
super().__init__(name=name,
instrument=instrument,
setpoints=setpoints,
shape=(100, 50, 20),
label='Flower Power Spectrum in 3D',
unit='V/sqrt(Hz)',
setpoint_names=('Frequency0', 'Frequency1',
'Frequency2'),
setpoint_units=('Hz', 'Other Hz', "Third Hz"))
def __init__(self, name, instrument, **kwargs):
self.start = 0
self.stop = 2e6
self.npts = (100, 50, 20)
sp1 = np.linspace(self.start, self.stop, self.npts[0])
sp2 = np.linspace(self.start, self.stop, self.npts[1])
sp3 = np.linspace(self.start, self.stop, self.npts[2])
setpoints = setpoint_generator(sp1, sp2, sp3)
super().__init__(
name=name,
instrument=instrument,
setpoints=setpoints,
shape=(100, 50, 20),
label="Flower Power Spectrum in 3D",
unit="V/sqrt(Hz)",
setpoint_names=("Frequency0", "Frequency1", "Frequency2"),
setpoint_units=("Hz", "Other Hz", "Third Hz"),
**kwargs,
)