94 lines
3.6 KiB
Python
94 lines
3.6 KiB
Python
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from time import sleep
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import numpy as np
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from matplotlib import pyplot as plt
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import pyvisa
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from .keithley import reset
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from ..utility import testing as _testing
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def measure_count(instr, count=100, interval=0.05, update_func=None, update_interval=0.5, beep_done=True, verbose=True):
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"""
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Take <count> measurements with <interval> inbetween
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@details
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Uses the devices overlappedY function to make the measurements asynchronosly
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The update_func is optional and only used when I == True and V == True
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The update_func does not necessarily get all the values that are measured. To obtain the whole measurement, get them from the device buffers (smua.nvbufferX)
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@param instr: pyvisa instrument
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@param update_func: Callable that processes the measurements: (index, ival, vval) -> None
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@param update_interval: interval at which the update_func is called
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"""
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f_meas = "smua.measure.overlappediv(smua.nvbuffer1, smua.nvbuffer2)"
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# if V and I:
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# elif V:
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# f_meas = "smua.measure.overlappedv(smua.nvbuffer1)"
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# elif I:
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# f_meas = "smua.measure.overlappedi(smua.nvbuffer1)"
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# else:
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# print("I and/or V needs to be set to True")
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# return
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i = 0
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reset(instr, verbose=verbose)
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instr.write(f"smua.measure.count = {count}")
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instr.write(f"smua.measure.interval = {interval}")
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# start measurement
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instr.write(f"smua.source.output = smua.OUTPUT_ON")
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instr.write(f_meas)
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sleep(update_interval)
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# for live viewing
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query = """if smua.nvbufferX.n > 0 then print(smua.nvbufferX.readings[smua.nvbufferX.n]) else print(0) end"""
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# will return 2.0 while measruing
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while float(instr.query("print(status.operation.measuring.condition)").strip("\n ")) != 0:
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if update_func:
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try:
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ival = float(instr.query(query.replace("X", "1")).strip("\n"))
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vval = float(instr.query(query.replace("X", "2")).strip("\n"))
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update_func(i, ival, vval)
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except ValueError as e:
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if i != 0:
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pass
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else:
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print(f"measure_count: ValueError: {e}")
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sleep(update_interval)
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i += 1
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instr.write(f"smua.source.output = smua.OUTPUT_OFF")
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if beep_done:
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instr.write("beeper.beep(0.3, 1000)")
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def measure(instr, interval, update_func=None, max_measurements=None):
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"""
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@details:
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- Resets the buffers
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- Until KeyboardInterrupt:
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- Take measurement
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- Call update_func
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- Wait interval
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Uses python's time.sleep() for waiting the interval, which is not very precise. Use measure_count for better precision
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You can take the data from the buffer afterwards, using save_csv
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@param instr: pyvisa instrument
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@param update_func: Callable that processes the measurements: (index, ival, vval) -> None
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@param max_measurements : maximum number of measurements. None means infinite
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"""
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reset(instr, verbose=True)
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instr.write("smua.source.output = smua.OUTPUT_ON")
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instr.write("format.data = format.ASCII\nformat.asciiprecision = 12")
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try:
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i = 0
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while max_measurements is None or i < max_measurements:
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ival, vval = tuple(float(v) for v in instr.query("print(smua.measure.iv(smua.nvbuffer1, smua.nvbuffer2))").strip('\n').split('\t'))
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if update_func:
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update_func(i, ival, vval)
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sleep(interval)
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i += 1
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except KeyboardInterrupt:
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pass
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instr.write("smua.source.output = smua.OUTPUT_OFF")
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print("Measurement stopped" + " "*50)
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