给出安捷伦33120A和EG&G 7260 DSP Lock-in Amplifier扫描音叉谐振子频率使用pyvisa库并绘图的python代码

以下是一个使用pyvisa库和matplotlib库的Python代码，可以通过安捷伦33120A和EG&G 7260 DSP Lock-in Amplifier扫描音叉谐振子频率并绘制图表。

import visa
import time
import numpy as np
import matplotlib.pyplot as plt

# Connect to instruments
rm = visa.ResourceManager()
gen = rm.open_resource('USB0::0x0957::0x0407::MY44016679::INSTR')
lockin = rm.open_resource('GPIB0::1::INSTR')

# Configure function generator
gen.write('*RST')
gen.write(':SOUR:FUNC SIN')
gen.write(':SOUR:FREQ:MODE CW')
gen.write(':SOUR:VOLT:UNIT VPP')
gen.write(':SOUR:VOLT 2.0') # Set amplitude to 2 Vpp
gen.write(':OUTP ON')

# Configure lock-in amplifier
lockin.write('*RST')
lockin.write('HARM 1') # Set detection harmonic to 1
lockin.write('ISRC 1') # Set input to A
lockin.write('ICPL 0') # Set input coupling to AC
lockin.write('IGND 1') # Set input ground to FLOAT
lockin.write('SENS 22') # Set sensitivity to 1 nV/fA
lockin.write('OFLT 1') # Set time constant to 1 s
lockin.write('SYNC 0') # Set synchronous detection to OFF

# Scan frequency and measure output
freqs = np.linspace(1, 10000, 1000) # Scan frequencies from 1 Hz to 10 kHz
output = []
for freq in freqs:
    gen.write(':SOUR:FREQ {:.6f}'.format(freq))
    time.sleep(0.01)
    lockin.write('REST') # Reset lock-in amplifier
    time.sleep(0.1)
    output.append(float(lockin.query('OUTP?'))) # Measure output

# Plot results
plt.plot(freqs, output)
plt.xlabel('Frequency (Hz)')
plt.ylabel('Output (V)')
plt.show()

# Disconnect from instruments
gen.write(':OUTP OFF')
gen.close()
lockin.close()

请注意，此代码仅供参考，可能需要根据实际情况进行调整。