Example Python script to implement the Spectrum Analyzer

For more Python examples, please refer to this link.

#
# moku example: Plotting Spectrum Analyzer
#
# This example demonstrates how you can configure the Spectrum Analyzer
# instrument and plot its spectrum data in real-time. 
#
# (c) 2021 Liquid Instruments Pty. Ltd.
#
import logging


import matplotlib.pyplot as plt
from moku.instruments import SpectrumAnalyzer


logging.basicConfig(format='%(asctime)s:%(name)s:%(levelname)s::%(message)s')
logging.getLogger('moku_client').setLevel(logging.INFO)


# Connect to your Moku by its ip address using SpectrumAnalyzer('192.168.###.###')
# or by its serial number using SpectrumAnalyzer(serial=123)
i = SpectrumAnalyzer('192.168.###.###', force_connect=False)


try:
    # Configure the Spectrum Analyzer 
    i.set_span(frequency1=0, frequency2=30e3)
    i.disable_output(1)
    i.set_rbw('Auto')  # Auto-mode
    
    # Configure ADC inputs
    i.set_frontend(1, impedance='1MOhm', coupling='DC', range='10Vpp')
    i.set_frontend(2, impedance='1MOhm', coupling='DC', range='10Vpp')


    # Set up basic plot configurations
    line1, = plt.plot([])
    line2, = plt.plot([])
    plt.ion()
    plt.show()
    plt.grid(b=True)
    plt.ylim([-2, 2])
    plt.autoscale(axis='x', tight=True)


    # Get an initial frame of data to set any frame-specific plot parameters
    frame = i.get_data()


    # Format the x-axis as a frequency scale
    ax = plt.gca()


    # Get and update the plot with new data
    while True:
        frame = i.get_data()
        
        # Set the frame data for each channel plot
        line1.set_ydata(frame['ch1'])
        line2.set_ydata(frame['ch2'])
        # Frequency axis shouldn't change, but to be sure
        line1.set_xdata(frame['frequency'])
        line2.set_xdata(frame['frequency'])
        # Ensure the frequency axis is a tight fit
        ax.relim()
        ax.autoscale_view()


        # Redraw the lines
        plt.draw()
        plt.pause(0.001)


except Exception as e:
    print(f'Exception occurred: {e}')
finally:
    # Close the connection to the Moku device
    # This ensures network resources and released correctly
    i.relinquish_ownership()