mirror of
https://github.com/njchorda/Agilent-34405A-MATLAB-Library.git
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Nathan Chordas-Ewell
085c1cb49d
Added documentation for Agilent34405A MATLAB Instrument Driver, including requirements, installation instructions, usage examples, supported measurement modes, configuration utilities, properties, and notes.
130 lines
3.3 KiB
Markdown
130 lines
3.3 KiB
Markdown
# Agilent34405A — MATLAB Instrument Driver
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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.
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---
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## Requirements
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- MATLAB with the **Instrument Control Toolbox**
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- **NI-VISA** driver installed
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- `Agilent34405AStates` enumeration class (companion file)
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---
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## Installation
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1. Clone or download this repository.
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2. Add the folder to your MATLAB path:
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```matlab
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addpath('/path/to/Agilent34405A');
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```
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3. Ensure the multimeter is connected via USB and recognized by NI-VISA.
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---
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## Quick Start
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```matlab
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% Instantiate — automatically finds the instrument via USB
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dmm = Agilent34405A();
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% Read DC voltage
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v = dmm.readDCV();
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% Read AC current
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i = dmm.readACI();
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% Read temperature
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t = dmm.readTemp();
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% Clean up when done
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dmm.deInit();
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```
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---
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## Supported Measurement Modes
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| Method | Description |
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| `readDCV()` | DC Voltage |
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| `readACV()` | AC Voltage |
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| `readDCI()` | DC Current |
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| `readACI()` | AC Current |
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| `readTemp()` | Temperature |
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| `read2WRes()` | 2-Wire Resistance |
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| `readCont()` | Continuity |
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| `readDiode()` | Diode Test |
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| `readCapacitance()` | Capacitance |
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| `readFrequency()` | Frequency |
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| `readPeriod()` | Period |
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| `scan()` | Scan mode |
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All measurement methods automatically switch the instrument to the correct mode if it isn't already configured.
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---
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## Configuration & Utilities
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### Set Measurement Scale
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```matlab
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% obj.setScale(state_string, [resolution, range])
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dmm.setScale('VOLT:DC', [0.001, 10]);
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```
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### Trigger & Sample Settings
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```matlab
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dmm.sampleCount = 20; % Number of samples (default: 10)
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dmm.triggerCount = 4; % Trigger count (default: 1)
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dmm.setSampleCount(); % Apply sample count to instrument
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dmm.setTriggerCount(); % Apply trigger count to instrument
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dmm.setTriggerSource('BUS'); % Set trigger source
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```
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### Send Arbitrary SCPI Command
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```matlab
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% Automatically reads response if command contains '?'
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response = dmm.sendCommand('VOLT:DC:RANG?');
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dmm.sendCommand('DISP:TEXT "Hello"');
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```
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### Other Utilities
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```matlab
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dmm.getConfig() % Query current instrument configuration
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dmm.selfTest() % Run built-in self-test and print result
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dmm.reset() % Send *RST to instrument
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dmm.setBeep(true) % Enable/disable beeper
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dmm.setLocal() % Return front-panel control to user
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dmm.approxTime(state) % Benchmark acquisition time for a given state
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dmm.deInit() % Cleanly close and release the VISA connection
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```
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---
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## Properties
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| Property | Default | Description |
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| `visaAddress` | *(auto-detected)* | USB/VISA address of the instrument |
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| `state` | `DCV` | Current measurement mode |
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| `numSamples` | `512` | Internal sample buffer size |
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| `sampleCount` | `10` | Samples per trigger sent to instrument |
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| `triggerCount` | `8` | Number of triggers |
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---
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## Notes
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- The constructor **automatically detects** the instrument address using `instrhwinfo('visa','ni')` — no manual address configuration needed.
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- The beeper is **silenced on startup** by default.
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- `deInit()` should always be called when finished to cleanly release the VISA resource.
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---
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## License
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MIT License — see [LICENSE](LICENSE) for details.
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