PyVISA Rigol DL3021 via LXI (TCP SCPI) example

First install using

sudo pip install pyvisa pyvisa-py

The following example will connec to a LXI-enabled (license required!!!) DL3021 at IP address 192.168.178.31

import pyvisa
import time

rm = pyvisa.ResourceManager()
inst = rm.open_resource("TCPIP0::10.9.2.31::INSTR")
# Query if instrument is present
# Prints e.g. "RIGOL TECHNOLOGIES,DL3021,DL3A204800938,00.01.05.00.01"
print(inst.query("*IDN?"))

# Set to constant resistance mode
inst.write(":SOURCE:FUNCTION RESISTANCE")
# Set to 3 Ohms
inst.write(":SOURCE:RESISTANCE:LEVEL:IMMEDIATE 3.0")
# Enable electronic load
inst.write(":SOURCE:INPUT:STATE On")
# Wait for value to stabilize
time.sleep(2)
# Measure!
print("Voltage: ", inst.query(":MEASURE:VOLTAGE?").strip())
print("Current: ", inst.query(":MEASURE:CURRENT?").strip())
print("Power: ", inst.query(":MEASURE:POWER?").strip())

This will print, for example:

RIGOL TECHNOLOGIES,DL3021,DL3A204800938,00.01.05.00.01

Voltage:  2.885810
Current:  0.961862
Power:  2.775752

with some power supply attached of course.