Connecting to MS9740A by Anritsu in Python

Instrument Card

The MS9740A supports nine application measurement modes (DFBLD, FP-LD, LED, PMD, Opt. Amp, Opt. Amp (Multi-channel), WDM, LD Module, WDM Filter) for measurement targets

Device Specification: here

Manufacturer card: ANRITSU

Anritsu Has Testing Solutions for Automotive, Government, Data Center, & IoT Industries. Test Solutions for IoT Devices, Government Radar, Automotive, & Signal Integrity.

• Headquarters: JAPAN
• Yearly Revenue (millions, USD): 670
• Vendor Website: here

Connect to the MS9740A in Python

Read our guide for turning Python scripts into Flojoy nodes.

Flojoy

PROTOCOLS > SCPI

📄 IDN

Query a device's identity through the universal *IDN? SCPI command.

📄 MEASURE VOLTAGE

Query an instrument's measured output voltage, such as a DMM or power supply.

📄 SCPI WRITE

Write a SCPI command to a connected bench-top instrument and return the result.

PyMeasure

import logging
from pymeasure.instruments import Instrument
from pymeasure.instruments.anritsu import AnritsuMS9710C
from pymeasure.instruments.validators import (
    strict_discrete_set,
    truncated_discrete_set,
    truncated_range,
)

log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())


class AnritsuMS9740A(AnritsuMS9710C):
    """Anritsu MS9740A Optical Spectrum Analyzer."""

    def __init__(self, adapter, name="Anritsu MS9740A Optical Spectrum Analyzer", **kwargs):
        """Constructor."""
        self.analysis_mode = None
        super().__init__(
            adapter, name, **kwargs)

    ####################################
    # Spectrum Parameters - Wavelength #
    ####################################

    resolution = Instrument.control(
        "RES?", "RES %s", "Resolution (nm)",
        validator=truncated_discrete_set,
        values=[0.03, 0.05, 0.07, 0.1, 0.2, 0.5, 1.0],
    )

    resolution_vbw = Instrument.control(
        "VBW?", "VBW %s", "Video Bandwidth Resolution",
        validator=strict_discrete_set,
        values=["1MHz", "100kHz", "10kHz", "2kHz", "1kHz", "200Hz", "100Hz", "10Hz"]
    )

    average_sweep = Instrument.control(
        "AVS?", "AVS %d",
        "Nr. of averages to make on a sweep (1-1000), with 1 being a single (non-averaged) sweep",
        validator=truncated_range, values=[1, 1000]
    )

    sampling_points = Instrument.control(
        "MPT?", "MPT %d", "Number of sampling points",
        validator=truncated_discrete_set,
        values=[51, 101, 251, 501, 1001, 2001, 5001, 10001, 20001, 50001],
        get_process=lambda v: int(v)
    )

    ##########################
    #  Data Memory Commands  #
    ##########################

    data_memory_select = Instrument.control(
        "TTP?", "TTP %s",
        "Memory Data Select.",
        validator=strict_discrete_set,
        values=["A", "B", "C", "D", "E", "F", "G", "H", "I", "J"]
    )

    def repeat_sweep(self, n=20, delay=0.5):
        """Perform a single sweep and wait for completion."""
        log.debug("Performing a repeat Spectrum Sweep")
        self.clear()
        self.write('SRT')
        self.wait_for_sweep(n=n, delay=delay)

This script defines a class AnritsuMS9740A that inherits from AnritsuMS9710C (which is another instrument class provided by Pymeasure). The AnritsuMS9740A class adds additional control properties and methods specific to the Anritsu MS9740A Optical Spectrum Analyzer.

The control properties defined in the class, such as resolution, resolution_vbw, average_sweep, sampling_points, and data_memory_select, allow you to interact with the instrument by reading and writing specific commands.

The repeat_sweep method performs a single sweep and waits for completion. It sends the command ‘SRT’ to start the sweep and then waits for the sweep to complete using the wait_for_sweep method.

Note that this script only defines the class and its properties/methods. To use it, you need to create an instance of the AnritsuMS9740A class and connect it to your instrument using an appropriate adapter.