HP manual Familiarizing Yourself with the Driver, Examples

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To see the list of drivers registered with the IVI Foundation, go to

http://www.ivifoundation.org.

Familiarizing Yourself with the Driver

Although the examples in IVI Getting Started Guide use a DMM driver, you will likely employ a variety of IVI drivers to develop test programs. To jumpstart that task, you’ll want to familiarize yourself quickly with drivers you haven’t used before. Most ADEs provide a way to explore IVI drivers to learn their functionality. In each chapter, where applicable, we add a note explaining how to view the available functions. In addition, browsing an IVI driver’s help file often proves an excellent way to learn its functionality.

Examples

As we noted above, each example chapter in IVI Getting Started Guide shows you how to use an IVI driver to write and run a program that performs a simple measurement on a simulated instrument and returns the result. The examples demonstrate common steps using IVI drivers. Where practical, every example includes the steps listed below:

Download and Install the IVI driver– covered in the Download and Install IVI Drivers section above.

Determine the VISA address string – Examples in IVI Getting Started Guide use the simulate mode, so we chose the address string GPIB0::23::INSTR, often shown as GPIB::23. If you need to determine the VISA address string for your instrument and the ADE does not provide it automatically, use an IO application, such as National Instruments Measurement and Automation Explorer (MAX) or Agilent Connection Expert.

Reference the driver or load driver files – For the examples in this guide, the driver is the Agilent 34401A IVI-COM Specific Driver, Version 1.1.0.11, March 2006 (from Agilent Technologies) or the Agilent 34401A IVI-C

Specific driver, Version 4.1, October 2006 (from National Instruments).

Create an instance of the driver in ADEs that use COM – For the examples in this guide, the driver is the Agilent 34401A (IVI-COM) or HP 34401 (IVI-C).

Write the program:

Initialize the instrument – Initialize is required when using any IVI driver. Initialize establishes a communication link with the instrument and must be called before the program can do anything with the instrument. We set reset to true, ID query to false, and simulate to true.

Setting reset to true tells the driver to initially reset the instrument. Setting the ID query to false prevents the driver from verifying that the connected instrument is the one the driver was written for. Finally, setting simulate to true tells the driver that it should not attempt to connect to a physical instrument, but use a simulation of the instrument.

Configure the instrument – We set a range of 1.5 volts and a resolution of 0.001 volts (1 millivolt).

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HP manual Familiarizing Yourself with the Driver, Examples

Drive specifications

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