def He3_instr(self):
print "Initializing Instruments..."
self.lockin1 = SRS830.SRS830("GPIB0::8")
self.lockin2 = SRS830.SRS830("GPIB0::16")
self.gate = DAC488.device("GPIB0::10")
self.gate.set_range(1, 3)
self.temp = LS340.device("GPIB0::12")
"""
Created on Thu Jun 07 12:11:52 2012
@author: BRAM
"""
import SRS830
import DAC488
import lakeshore332
import time
t_start = time.time()
frequency = 108.25 # hz
amplitude = 5.0 # V
time_constant = 100.0 #ms
lockin = SRS830.device('GPIB1::8')
gate = DAC488.device('GPIB1::10')
temp = lakeshore332.device('GPIB1::12')
gate.set_range(1,3)
def read(gateVoltage):
t = time.time() - t_start
t = float(t)
x_value = lockin.read_input(1)
x = float(x_value)
# gate = gate
temperature = float(temp.read('b'))
conductance = calc_conduct(x)
return [gateVoltage, conductance, x, temperature, t]
def calc_conduct(voltage):
# Program Parameters
rampTime = 10.0 # (minutes)
maxBias = -2.5
steps = int(rampTime*60)
biasVoltage = -0.0
stepTime = float(rampTime*60/steps)
stepVoltage = float(maxBias/steps)
timeout = 120.0 #(minutes)
timeout #(seconds)
# Initialize the devices
lockin = SRS830.device('GPIB1::8')
bias = DAC488.device('GPIB1::10')
temp = lakeshore332.device('GPIB1::12')
bias.set_range(1,3)
t_start = time.time()
out_file = open ('test.dat', 'w')
# First we need to slowly rampt to our bias voltage
print "Ramping up the Bias Voltage"
out_file.write("Sample: VA150InSn2\n Measuring with 0.05V/500k (100nA)\n")
out_file.write("Ramping up the Bias Voltage\n")
print("...")
print("...")
