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Nathan Chordas-Ewell 085c1cb49d Add README for Agilent34405A MATLAB Driver

Added documentation for Agilent34405A MATLAB Instrument Driver, including requirements, installation instructions, usage examples, supported measurement modes, configuration utilities, properties, and notes.

2026-02-23 02:00:04 -05:00

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Agilent34405A — MATLAB Instrument Driver

A MATLAB class for controlling the Agilent 34405A bench multimeter over USB/VISA. Provides a clean, object-oriented interface for all major measurement modes, configuration, and instrument lifecycle management.

Requirements

MATLAB with the Instrument Control Toolbox
NI-VISA driver installed
Agilent34405AStates enumeration class (companion file)

Installation

Clone or download this repository.
Add the folder to your MATLAB path:
```
addpath('/path/to/Agilent34405A');
```
Ensure the multimeter is connected via USB and recognized by NI-VISA.

Quick Start

% Instantiate — automatically finds the instrument via USB
dmm = Agilent34405A();

% Read DC voltage
v = dmm.readDCV();

% Read AC current
i = dmm.readACI();

% Read temperature
t = dmm.readTemp();

% Clean up when done
dmm.deInit();

Supported Measurement Modes

Method	Description
`readDCV()`	DC Voltage
`readACV()`	AC Voltage
`readDCI()`	DC Current
`readACI()`	AC Current
`readTemp()`	Temperature
`read2WRes()`	2-Wire Resistance
`readCont()`	Continuity
`readDiode()`	Diode Test
`readCapacitance()`	Capacitance
`readFrequency()`	Frequency
`readPeriod()`	Period
`scan()`	Scan mode

All measurement methods automatically switch the instrument to the correct mode if it isn't already configured.

Configuration & Utilities

Set Measurement Scale

% obj.setScale(state_string, [resolution, range])
dmm.setScale('VOLT:DC', [0.001, 10]);

Trigger & Sample Settings

dmm.sampleCount  = 20;   % Number of samples (default: 10)
dmm.triggerCount = 4;    % Trigger count (default: 1)

dmm.setSampleCount();    % Apply sample count to instrument
dmm.setTriggerCount();   % Apply trigger count to instrument
dmm.setTriggerSource('BUS');  % Set trigger source

Send Arbitrary SCPI Command

% Automatically reads response if command contains '?'
response = dmm.sendCommand('VOLT:DC:RANG?');
dmm.sendCommand('DISP:TEXT "Hello"');

Other Utilities

dmm.getConfig()       % Query current instrument configuration
dmm.selfTest()        % Run built-in self-test and print result
dmm.reset()           % Send *RST to instrument
dmm.setBeep(true)     % Enable/disable beeper
dmm.setLocal()        % Return front-panel control to user
dmm.approxTime(state) % Benchmark acquisition time for a given state
dmm.deInit()          % Cleanly close and release the VISA connection

Properties

Property	Default	Description
`visaAddress`	(auto-detected)	USB/VISA address of the instrument
`state`	`DCV`	Current measurement mode
`numSamples`	`512`	Internal sample buffer size
`sampleCount`	`10`	Samples per trigger sent to instrument
`triggerCount`	`8`	Number of triggers

Notes

The constructor automatically detects the instrument address using instrhwinfo('visa','ni') — no manual address configuration needed.
The beeper is silenced on startup by default.
deInit() should always be called when finished to cleanly release the VISA resource.

License

MIT License — see LICENSE for details.

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