niscope_types.InitiateAcquisitionRequest(vi=vi))).status)
# Allocate space for the waveform according to the max number of
# points to fetch and the number of waveforms.
channel_list = channels.split(',')
total_samples = int(total_acquisition_time_in_seconds * sample_rate_in_hz)
waveforms = [
np.ndarray(total_samples, dtype=np.float64) for c in channel_list
]
# Set fetch relative to attribute.
CheckForError(vi, (client.SetAttributeViInt32(
niscope_types.SetAttributeViInt32Request(
vi=vi,
channel_list="",
attribute_id=niscope_types.NiScopeAttributes.
NISCOPE_ATTRIBUTE_FETCH_RELATIVE_TO,
value=niscope_types.NiScopeInt32AttributeValues.
NISCOPE_INT32_FETCH_RELATIVE_TO_VAL_READ_POINTER))).status)
# Fetch continuously until all samples are acquired.
current_pos = 0
samples_per_fetch = 100
while current_pos < total_samples:
# We fetch each channel at a time so we don't have to de-interleave afterwards.
# We do not keep the wfm_info returned from fetch.
for channel_name, waveform in zip(channel_list, waveforms):
fetch_response = client.Fetch(
niscope_types.FetchRequest(vi=vi,
channel_list=channel_name,
# Configure Horizontal Timing
config_result = scope_service.ConfigureHorizontalTiming(
niscope_types.ConfigureHorizontalTimingRequest(vi=vi,
min_sample_rate=1000000,
min_num_pts=1000,
ref_position=50,
num_records=1,
enforce_realtime=True))
CheckForError(vi, config_result.status)
# Setup an Edge Trigger
result = scope_service.SetAttributeViInt32(
niscope_types.SetAttributeViInt32Request(
vi=vi,
attribute_id=niscope_types.NiScopeAttributes.
NISCOPE_ATTRIBUTE_TRIGGER_TYPE,
value=niscope_types.NiScopeInt32AttributeValues.
NISCOPE_INT32_TRIGGER_TYPE_VAL_EDGE_TRIGGER))
CheckForError(vi, result.status)
conf_trigger_edge_result = scope_service.ConfigureTriggerEdge(
niscope_types.ConfigureTriggerEdgeRequest(
vi=vi,
trigger_source=channels,
level=0.00,
slope=niscope_types.TriggerSlope.
TRIGGER_SLOPE_NISCOPE_VAL_POSITIVE,
trigger_coupling=niscope_types.TriggerCoupling.
TRIGGER_COUPLING_NISCOPE_VAL_DC,
holdoff=0.0))
CheckForError(vi, conf_trigger_edge_result.status)
confTrigger_edge_result = scope_service.ConfigureTriggerEdge(
niscope_types.ConfigureTriggerEdgeRequest(
vi=vi,
trigger_source=channels,
level=0.00,
trigger_coupling=niscope_types.TriggerCoupling.
TRIGGER_COUPLING_NISCOPE_VAL_DC,
slope=niscope_types.TriggerSlope.TRIGGER_SLOPE_NISCOPE_VAL_POSITIVE))
CheckStatus(scope_service, vi, confTrigger_edge_result)
result = scope_service.SetAttributeViInt32(
niscope_types.SetAttributeViInt32Request(
vi=vi,
channel_list=channels,
attribute_id=niscope_types.NiScopeAttributes.
NISCOPE_ATTRIBUTE_MEAS_REF_LEVEL_UNITS,
value=niscope_types.NiScopeInt32AttributeValues.
NISCOPE_INT32_REF_LEVEL_UNITS_VAL_VOLTS))
CheckStatus(scope_service, vi, result)
# Read a waveform from the scope
read_result = scope_service.Read(
niscope_types.ReadRequest(vi=vi,
channel_list=channels,
timeout=10000,
num_samples=100000))
CheckStatus(scope_service, vi, read_result)
values = read_result.waveform[0:10]
print(values)