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from pathlib import Path
import time
from lab_control.function_generator import FunctionGenerator
from lab_control.oscilloscope import Oscilloscope
from lab_control.measurement import Measurement, getLinearRange
class FrequencyResponseMeasurement(Measurement):
def __init__(self):
self.minFrequency = 20e0
self.maxFrequency = 16e3
self.steps = 50
self.inputAmplitude = 0.1
self.functionGeneratorChannel = 1
self.oscilloscopeChannel = 1
self.measurementDone = False
self.data = None
def measure(self, osc: Oscilloscope, fg: FunctionGenerator) -> None:
frequencies = getLinearRange(self.minFrequency, self.maxFrequency, self.steps)
self.data = []
# Initial set up
fg.setAmplitude(self.functionGeneratorChannel, self.inputAmplitude)
fg.setFunction(self.functionGeneratorChannel, FunctionGenerator.SINE)
fg.setOn(self.functionGeneratorChannel)
osc.setVoltsPerDivision(self.oscilloscopeChannel, self.inputAmplitude / (osc.getDivisionsDisplayed() - 2))
for f in frequencies:
fg.setFrequency(self.functionGeneratorChannel, f)
#time.sleep(0.2)
response = osc.measureAmplitude(self.oscilloscopeChannel)
self.data.append((f, response))
self.measurementDone = True
def dumpToCSV(self, path: Path) -> None:
if self.data is None:
return
with open(path, "w") as f:
f.write("Frequency (Hz),Amplitude (V)")
for entry in self.data:
f.write(f"\n{entry[0]},{entry[1]}")
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