• Using the WaveForms Power Supplies and Data Logger with a simple resistor circuit.

这是一个快速简单的项目，它将介绍如何使用电子探索器板使用波形电源和数据记录仪。将实现的电路将是一个简单的网络，该网络由4个不同值的4个电阻器。波形电源将用于电路供电。电阻网络的两个“节点”将连接到EE板上的不同电压表通道，并且波形数据记录器将用于测量这些感兴趣的节点的电压。作为该项目的一部分，将讨论电压隔板和串联/平行电阻的简短背景。

• Electronics Explorer Board w/ Power Supply and USB cable
• From the Starter Parts Kit:
  • 470Ω Resistor x 2
  • 1kΩ Resistor
  • 100Ω电阻
  • Jumper wires
• WaveForms Software (下载） -WaveForms 3.5.4 is used in this tutorial

1. Connect the EE Board to your PC with the USB cable.
2. Connect the board's external power supply and flip theReady切换到上位置。
3. 构建电路。
   • The figure below shows the completed circuit.
4. Launch the WaveForms Software. TheDevice Managerwill pop up. Click yourEExploreron the list and clickSelect。The WaveForms main window will now appear.
5. Click on the Power Supplies icon打开EE板的电源。配置如下显示的窗口：
   • In the top left, deselect all of the boxes except the one corresponding toVP+。
     • VP-,Vcc,vref1， 和VREF2should beOFF。VP+should beRdy。
   • 在盒子中标记为Positive Supply - VP+ Rdy，将电压设置为5V和电流100mA。
   • In the plot area below that, deselect all the boxes except theVmtr 1和Vmtr 2rows that are measuring a voltage value. These plots are not the ones that will be used in this tutorial, but offer an alternate view. BY clicking on the green plus sign用户可能会在图表中添加其他图，包括VP+导轨的电压和其他数学派生图。
   • Notice thatVP+是我们唯一的电源打开,因为this is where the power to the circuit is coming from on the EE Board.
   • Confirm your settings are correct by comparing your window to the figure below.
6. 通过“欢迎”选项卡返回到主波形屏幕，然后单击数据记录器图标
   • In the plot area deselect all of the boxes except for theC1 DC和C2 DC(Channel 1 DC and Channel 2 DC inputs).
     • It is recommended that the settings for each of the plots are changed so that they do not auto-range, providing a more clear and less jumpy representation of the voltage divider circuit.
7. After configuring the settings, click theRunbutton in the Data Logger and on the Power Supplies tab click top left button that saysMaster Enable。This will turn the power on. Switch back to the Logger window.
8. 观察结果，尤其是记录器电压表1和2的值。通道1和2读取的值应分别约为2.18V和1.80V。注意：除数据记录器外，波形还具有专用的电压表工具。本教程中未使用电压表的原因是，电压表工具使用示波器输入在40 V PK2PK的最大范围内，导致分辨率约为40 mV。简要讨论电压隔板和串联/平行电阻器将解释如何验证这些值。

The figure to the right shows the original circuit from step 3. Nodes A and B are the locations of the circuit that were measured with channels 1 and 2, respectively. The discussion regarding how the values at nodes A and B were obtained will begin with a discussion ofseriesresistors.

Resistors being in series refers to them being in the same line. To combine resistors in series, simply add their values together. For example:R₃+ r₄=100Ω +470Ω=570Ω

应用上面的原理，电阻器r₃和r₄can be combined to a single resistor. This results in a simplified equivalent circuit, shown at the right.

The new simplified circuit consists of two resistors in平行。在并行结合电阻时，应用以下公式：

In our circuit, resistors R₂和r_3,4并联。应用上述方程式导致：
This leads to the further simplified circuit shown on the right. This circuit is a simple voltage divider that has isolated node A so the voltage at this node can be easily calculated.

Applying the standard voltage divider equation gives the voltage at node A.

请注意，此值与电压表1频道1测得的电压相匹配！

To find the voltage at node B, we will apply a fundamental concept of parallel circuits. This concept is as follows:并行组件，无论数量或值如何，它们的电压下降都相同。In our circuit this means that R₂has the 2.178V from Node A across it. Additionally, resistors R₃和r₄, when combined, have the same 2.178V across them. We can now apply the same voltage divider equation to R₃和r₄to find the voltage at Node B. You may want to refer back to the original circuit (shown again on the right) to see how we applied the voltage divider.

Notice that this matches the voltage measured at channel 2 of the voltmeter!

That concludes this project! Try applying different voltages withVP+or using different resistor values and check if your measured values match your calculations!