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 Comaptible Products 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.
|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|
|VoltageInput||Visual Basic .NET||Windows||Download|
|Date||Board Revision||Device Version||Comment|
|June 2017||0||106||Product Release|
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. If you would like to follow along, first 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:
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.
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:
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.
|Product||Voltage Sensor||Sensor Properties|
|Image||Part Number||Price||Voltage Difference Max||Input Voltage Min (DC)||Input Voltage Max (DC)|
|1135_0||$19.00||± 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||—||—|