def setup_waveform(self):
waveform = Waveform()
preamble = self.query('ACQ1:MEM?').strip().split(';')
wave_header = {}
for entry in preamble:
entry_parts = entry.split(',')
if len(entry_parts) == 2:
wave_header[entry_parts[0]] = entry_parts[1]
waveform.capture_time = waveform.capture_time = datetime.datetime.utcnow()
waveform.data_channel = wave_header['Source']
waveform.number_of_points = int(wave_header['Memory Length'])
waveform.x_unit = wave_header['Horizontal Units']
if waveform.x_unit.lower() == 's':
waveform.x_unit = 'Seconds'
waveform.x_scale = float(wave_header['Horizontal Scale'])
waveform.y_unit = wave_header['Vertical Units']
if waveform.y_unit.lower() == 'V':
waveform.y_unit = 'Volts'
waveform.y_scale = float(wave_header['Vertical Scale'])
return waveform
def setup_waveform(self):
"""
Fetch all the parameters needed to parse the wave data.
will be passed the waveform object.
:return: the waveform object if setup fails.
"""
waveform = Waveform()
waveform.data_channel = self.getDataChannel() # get active channel
waveform.capture_time = datetime.datetime.utcnow()
try:
preamble = self.query("WFMP?").split(';') # get waveform preamble and parse it
if len(preamble) > 5: # normal operation
waveform.number_of_points = int(preamble[5])
waveform.x_increment = float(preamble[8])
waveform.x_offset = float(preamble[9])
waveform.x_zero = float(preamble[10])
waveform.x_unit = preamble[11].strip('"')
if waveform.x_unit == 's':
waveform.x_unit = 'Seconds'
waveform.y_multiplier = float(preamble[12])
waveform.y_zero = float(preamble[13])
waveform.y_offset = float(preamble[14])
waveform.y_unit = preamble[15].strip('"')
else: # Selected channel is not active
waveform.error = waveform.data_channel \
+ ' is not active. Please select an active channel.'
return waveform
except Exception as e:
self.logger.error(e)