# Fetch the measured average frequency
fetch_result = scope_service.FetchMeasurementStats(
niscope_types.FetchMeasurementStatsRequest(
vi=vi,
channel_list=channels,
timeout=1,
scalar_meas_function=niscope_types.ScalarMeasurement.
SCALAR_MEASUREMENT_NISCOPE_VAL_AVERAGE_FREQUENCY))
CheckForError(vi, fetch_result.status)
print("Average Frequency: " +
str("%.2f" % round(fetch_result.result[0], 2)) + " Hz")
print("")
time.sleep(0.1)
except KeyboardInterrupt:
pass
except grpc.RpcError as rpc_error:
error_message = rpc_error.details()
if rpc_error.code() == grpc.StatusCode.UNAVAILABLE:
error_message = f"Failed to connect to server on {server_address}:{server_port}"
elif rpc_error.code() == grpc.StatusCode.UNIMPLEMENTED:
error_message = "The operation is not implemented or is not supported/enabled in this service"
print(f"{error_message}")
finally:
if ('vi' in vars() and vi.id != 0):
# close the session.
CheckForError(vi, (scope_service.Close(
niscope_types.CloseRequest(vi=vi))).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,
timeout=500000,
num_samples=samples_per_fetch))
CheckForError(vi, fetch_response.status)
waveform[current_pos:current_pos +
samples_per_fetch] = fetch_response.waveform
print(
f'Fetching channel {channel_name}\'s waveform for indices {current_pos} to {current_pos + samples_per_fetch - 1}'
)
print()
current_pos += samples_per_fetch
# Close session to NI-SCOPE module.
CheckForError(vi, (client.Close(niscope_types.CloseRequest(vi=vi))).status)
channel.close()
# If NI-SCOPE API throws an exception, print the error message.
except grpc.RpcError as e:
error_message = e.details()
print(error_message)
plt.subplots_adjust(wspace=0.5)
plt.pause(0.001)
time.sleep(0.1)
except KeyboardInterrupt:
pass
for i in range(len(sessions)):
sample_rate_result = scope_service.SampleRate(
niscope_types.SampleRateRequest(vi=session))
record_length_result = scope_service.ActualRecordLength(
niscope_types.ActualRecordLengthRequest(vi=session))
print(resources[i])
print("Actual Sample Rate = %f" % sample_rate_result.sample_rate)
print("Actual Record Length = %f\n" %
record_length_result.record_length)
except grpc.RpcError as rpc_error:
error_message = rpc_error.details()
if rpc_error.code() == grpc.StatusCode.UNAVAILABLE:
error_message = f"Failed to connect to server on {server_address}:{server_port}"
elif rpc_error.code() == grpc.StatusCode.UNIMPLEMENTED:
error_message = "The operation is not implemented or is not supported/enabled in this service"
print(f"{error_message}")
finally:
if ('vi' in vars() and vi.id != 0):
# close the sessions.
for session in sessions:
close_request_result = scope_service.Close(
niscope_types.CloseRequest(vi=session))
CheckForError(scope_service, session, close_request_result.status)
num_samples=10000))
CheckStatus(scope_service, vi, read_result)
values = read_result.waveform[0:10]
print(values)
# Update the plot with the new waveform
plt.plot(read_result.waveform[0:100])
fig.canvas.draw()
plt.pause(0.001)
# Fetch the measured average frequency
fetch_result = scope_service.FetchMeasurementStats(
niscope_types.FetchMeasurementStatsRequest(
vi=vi,
channel_list=channels,
timeout=1,
scalar_meas_function=niscope_types.ScalarMeasurement.
SCALAR_MEASUREMENT_NISCOPE_VAL_AVERAGE_FREQUENCY))
CheckStatus(scope_service, vi, fetch_result)
print("Average Frequency: " +
str("%.2f" % round(fetch_result.result[0], 2)) + " Hz")
print("")
time.sleep(0.1)
except KeyboardInterrupt:
pass
# Close
scope_service.Close(niscope_types.CloseRequest(vi=vi))
channel.close()
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
))
CheckForError(vi, result.status)
# Read a waveform from the scope
read_result = scope_service.Read(niscope_types.ReadRequest(
vi = vi,
channel_list = channels,
timeout = 10000,
num_samples = 100000
))
CheckForError(vi, read_result.status)
values = read_result.waveform[0:10]
print(values)
except grpc.RpcError as rpc_error:
error_message = rpc_error.details()
if rpc_error.code() == grpc.StatusCode.UNAVAILABLE:
error_message = f"Failed to connect to server on {server_address}:{server_port}"
elif rpc_error.code() == grpc.StatusCode.UNIMPLEMENTED:
error_message = "The operation is not implemented or is not supported/enabled in this service"
print(f"{error_message}")
finally:
if('vi' in vars() and vi.id != 0):
# close the session.
CheckForError(vi, (scope_service.Close(niscope_types.CloseRequest(
vi = vi
))).status)
