Connecting to DMM6500 Keithley by Keithley in Python

Instrument Card

6½ digit bench/system digital multimeter with large 5” (12.7cm) multi touch capacitive touchscreen and graphical display. It supports SCPI, TSP® scripting, Keithley 2000 SCPI emulation and Keysight 34401A SCPI emulation language modes.

Device Specification: here

Manufacturer card: KEITHLEY

Keithley Instruments is a measurement and instrument company headquartered in Solon, Ohio, that develops, manufactures, markets, and sells data acquisition products, as well as complete systems for high-volume production and assembly testing.

• Headquarters: Cleveland, Ohio, United States
• Yearly Revenue (millions, USD): 110.6
• Vendor Website: here

Demo: Record voltage over time with an Agilent 34401A multimeter

Connect to the DMM6500 Keithley 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.

QCodes

Here is a Python script that uses Qcodes to connect to a Keithley DMM6500 Multimeter:

from qcodes.instrument.visa import VisaInstrument
from qcodes.instrument.parameter import Parameter
from qcodes.utils.validators import Numbers


class KeithleyDMM6500(VisaInstrument):
    def __init__(self, name, address, **kwargs):
        super().__init__(name, address, terminator="\n", **kwargs)

        self.add_parameter(
            "voltage",
            get_cmd="MEAS:VOLT:DC?",
            get_parser=float,
            unit="V",
            vals=Numbers(),
        )

        self.add_parameter(
            "current",
            get_cmd="MEAS:CURR:DC?",
            get_parser=float,
            unit="A",
            vals=Numbers(),
        )

        self.add_parameter(
            "resistance",
            get_cmd="MEAS:RES?",
            get_parser=float,
            unit="Ohm",
            vals=Numbers(),
        )

        self.connect_message()

    def reset(self):
        self.write("*RST")


# Connect to the Keithley DMM6500
dmm = KeithleyDMM6500("dmm", "TCPIP0::192.168.1.1::INSTR")

# Reset the device
dmm.reset()

# Read voltage
voltage = dmm.voltage()
print("Voltage:", voltage)

# Read current
current = dmm.current()
print("Current:", current)

# Read resistance
resistance = dmm.resistance()
print("Resistance:", resistance)

# Close the connection
dmm.close()

This script creates a KeithleyDMM6500 class that inherits from VisaInstrument provided by Qcodes. It adds three parameters: voltage, current, and resistance, which are used to read the corresponding measurements from the multimeter.

The reset method is used to reset the device.

To use the script, you need to provide the appropriate address for your Keithley DMM6500 in the KeithleyDMM6500 instantiation. Then, you can call the parameter methods (voltage(), current(), resistance()) to read the measurements from the multimeter.

Note: Make sure you have Qcodes and the necessary dependencies installed before running this script.