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This Voltage Input Phidget provides a way to measure small voltages anywhere in a circuit. It plugs directly into a VINT port and has a set of selecable voltage ranges from ±1V down to ±10mV, with smaller ranges having higher precision (See the Connection & Compatibility tab for a list of VINT Hubs). This Phidget also has an automatic mode that continuously adjusts the range based on present voltage measurements, so you'll always have the most accurate measurement possible.
You can use this Phidget to measure current in a pinch: Just place a known resistor in series with the circuit, and measure the voltage drop across it. Knowing the voltage and resistance, you can then use Ohm's law to calculate the current.
This Phidget is electrically isolated, so a power surge on the circuit you're measuring will not damage your VINT Hub or your computer. Isolation also improves stability by eliminiating potential ground loops.
This Phidget is a smart device that must be controlled by a VINT Hub. For more information about VINT, have a look at the VINT Primer. You can use a Phidget Cable to simply and easily connect the two devices. Here's a list of all of the different VINT Hubs currently available:
|Image||Part Number||Price||Number of VINT Ports||Controlled By|
|HUB5000_0||$60.00||6||Local Network (Ethernet or Wi-Fi)|
Use a Phidget cable to connect this device to the hub. You can solder multiple cables together in order to make even longer Phidget cables, but you should be aware of the effects of having long wires in your system.
Welcome to the VCP1002 user guide! In order to get started, make sure you have the following hardware on hand:
Next, you will need to connect the pieces:
Now that you have everything together, let's start using the VCP1002!
In order to demonstrate the functionality of the VCP1002, the Phidget Control Panel running on a Windows machine will be used.
The Phidget Control Panel is available for use on both macOS and Windows machines.
To open the Phidget Control Panel on Windows, find the icon in the taskbar. If it is not there, open up the start menu and search for Phidget Control Panel
To open the Phidget Control Panel on macOS, open Finder and navigate to the Phidget Control Panel in the Applications list. Double click on the icon to bring up the Phidget Control Panel.
For more information, take a look at the getting started guide for your operating system:
Linux users can follow the getting started with Linux guide and continue reading here for more information about the VCP1002.
After plugging the VCP1002 into your computer and opening the Phidget Control Panel, you will see something like this:
The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
Double-click on the Voltage Input object , labelled 10-bit (±1V) Voltage Input Phidget, in order to run the example:
General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:
Before you can access the device in your own code, and from our examples, you'll need to take note of the addressing parameters for your Phidget. These will indicate how the Phidget is physically connected to your application. For simplicity, these parameters can be found by clicking the button at the top of the Control Panel example for that Phidget.
In the Addressing Information window, the section above the line displays information you will need to connect to your Phidget from any application. In particular, note the Channel Class field as this will be the API you will need to use with your Phidget, and the type of example you should use to get started with it. The section below the line provides information about the network the Phidget is connected on if it is attached remotely. Keep track of these parameters moving forward, as you will need them once you start running our examples or your own code.
You are now ready to start writing your own code for the device. The best way to do that is to start from our Code Samples.
Select your programming language of choice from the drop-down list to get an example for your device. You can use the options provided to further customize the example to best suit your needs.
Once you have your example, you will need to follow the instructions on the page for your programming language to get it running. To find these instructions, select your programming language from the Programming Languages page.
The VCP1002 is electrically isolated, so a power surge in the circuit you're measuring would only damage the VCP1002- it won't damage your Hub or your computer. Having isolation also helps prevent the formation of ground loops in your system.
Another advantage of isolation on the VCP1002 is the capability to measure the voltage differential between two points of a circuit regardless of their relation to ground, as long as the voltage differential between those points is within the specification of the sensor.
For example, take the pictured battery charging circuit; there is sufficient complexity between the current sense resistor (Rsense) and the VINT Hub that trying to directly measure the voltage with a non-isolated sensor could be a risky proposition. However, thanks to the isolated nature of the VCP1002, the voltage across the resistor may be measured directly, ignoring the circuits in between.
The VCP1002 is made to measure small voltages anywhere in a circuit. This makes it the ideal candidate for use with current sense resistors to measure current.
For an in-depth look at how to use current sense resistors with the VCP1002, see our article about Current Sense Resistors.
|Sensor Type||Voltage (DC)|
|Voltage Difference Max||± 1 V DC|
|Withstand Voltage Max||± 50 V DC|
|Sampling Interval Max||60 s/sample|
|Sampling Interval Min||40 ms/sample|
|Sensor Input Impedance||1 MΩ|
|Measurement Error Max||0.1 %|
|Number of Voltage Inputs||1|
|Voltage Resolution||1 mV DC|
|±10 mV Range|
|Voltage Resolution||300 nV DC|
|Voltage Offset Max||25 μV DC|
|Measurement Error Max||0.5 %|
|Voltage Noise||6 μV DC|
|±40 mV Range|
|Voltage Resolution||1.2 μV DC|
|Voltage Offset Max||40 μV DC|
|Measurement Error Max||0.25 %|
|Voltage Noise||25 μV DC|
|±200 mV Range|
|Voltage Resolution||6 μV DC|
|Voltage Offset Max||200 μV DC|
|Measurement Error Max||0.25 %|
|Voltage Noise||100 μV DC|
|±1 V Range|
|Voltage Resolution||28.8 μV DC|
|Voltage Offset Max||1 mV DC|
|Measurement Error Max||0.3 %|
|Voltage Noise||500 μV DC|
|Current Consumption Max||12 mA|
|Recommended Wire Size||16 - 26 AWG|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|
|Date||Board Revision||Device Version||Comment|
|June 2017||0||106||Product Release|
|VoltageInput||Visual Studio GUI||C#||Windows||Download|
|VoltageInput||Visual Basic .NET||Windows||Download|
|Product||Voltage Sensor||Sensor Properties|
|Image||Part Number||Price||Voltage Difference Max||Input Voltage Min (DC)||Input Voltage Max (DC)|
|1135_0B||$17.00||± 30 V DC||—||—|
|3509_1||$115.00||—||0 V DC||200 V DC|
|VCP1000_0||$50.00||± 40 V DC||—||—|
|VCP1001_0||$25.00||± 40 V DC||—||—|
|VCP1002_0||$25.00||± 1 V DC||—||—|