Add nivisa_dmm_measurement example

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Add a nivisa_dmm_measurement example, which uses pyvisa to perform a DMM measurement with NI Instrument Simulator v2.0 hardware. It also supports using pyvisa-sim to simulate the simulator hardware.

Why should this Pull Request be merged?

Implements the NI-VISA part of AB#2086086: Test Architect can access python example for using session management

What testing has been done?

Manually tested with InstrumentStudio, MeasurementLink UI Editor, and TestStand.

[bkeryan]

FYI, the NI Instrument Simulator v2.0 is a small plastic box that connects to a PC via GPIB and/or RS-232.

It simulates three instruments: a waveform generator, an oscilloscope, and a digital multimeter:

You can configure some settings in software by running the NI Instrument Simulator Wizard:

• GPIB multi-address vs. single address
• GPIB address numbers
• RS-232 baud rate and other configuration

I reset the simulator to its default factory settings, which includes GPIB multi-address mode with address 1-3.

[bkeryan]

.measui panel: copied from nidmm_measurement and removed outputs that aren't supported by the simulator.

[bkeryan]

TestStand:

Report w/duplicated measurement step (for more readings):

[bkeryan]

I created Test Case 2263609: Use a Python measurement service with NI-VISA in TestStand to document how to set up and run this example.

[bkeryan]

Neither NI nor the IVI Foundation distribute official Python support for VISA. I used pyvisa and pyvisa-sim.

[pbirkhol-ni]

This link is a blast from the past. :) http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=13039