1135 User Guide: Difference between revisions

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__NOINDEX__
<metadesc>The Phidgets Precision Voltage Sensor measures ±30V DC and connects to an Analog Input or VINT Hub port.</metadesc>
[[Category:UserGuide]]
[[Category:UserGuide]]
==Getting Started==
==Getting Started==
{{UgSensorIntro|1132|4-20mA Adapter|Voltage Input port}}
*voltage source


===Checking the Contents===
{{UGbox|
'''You should have received:'''
* A Precision Voltage sensor
* A sensor cable
|
'''In order to test your new Phidget you will also need:'''
* A PhidgetInterfaceKit 8/8/8
* A USB cable
* A 9V battery
||}}
===Connecting the Pieces===
{{UGbox|
#Connect the Precision Voltage Sensor to an Analog Input on the PhidgetInterfaceKit 8/8/8 board using the sensor cable.
#Connect the voltage source to the terminal block.  It is possible to connect the leads of the voltage source to either terminal - the reported voltage may just be of the opposite polarity.
#Connect the InterfaceKit board to your PC using the USB cable.
|
[[File:1135_0_Connecting_The_Hardware.jpg|400px|link=]]
||}}
===Testing Using Windows 2000 / XP / Vista / 7===


{{UGwin}}
Next, you will need to connect the pieces:
[[Image:1135_0_Connecting_The_Hardware.jpg|400px|right|link=]]
# Connect the 1135 to the HUB0000 with the Phidget cable.
# Connect a voltage source to the 1135. If you connect the supply backwards, the reported voltage will be negative.
# Connect the HUB0000 to your computer with the USB cable.


===Running Phidgets Sample Program===
<br clear="all">
{{UGIntroDone|1135}}


{{UGwin2|'''InterfaceKit-full'''}}
==Using the 1135==
{{UGcontrolpanelSensor|1135|HUB0000}}


{{UGbox6|
{{UGSensorVoltageInput|1135|differential voltage (V)}}
Double Click on the [[File:Ph.jpg|link=]] icon to activate the Phidget Control Panel and make sure that the '''Phidget InterfaceKit 8/8/8''' is properly attached  to your PC. 
|[[File:1018_2_Control_Panel_Screen.jpg|400px|link=]]
|
#Double Click on '''Phidget InterfaceKit 8/8/8''' in the Phidget Control Panel to bring up InterfaceKit-full and check that the box labelled Attached contains the word True.
#Make sure that the Ratiometric box is not Ticked.
#With no connections on the input terminal blocks, the Analog In value should be approximately 500. The value displayed shows the 9V battery actual voltage when the battery’s + wire is connected to the VIN+ terminal block.
#You can adjust the input sensitivity by moving the slider pointer.
#Click on the Sensors button to bring up the Advanced Sensor Form.
|
[[File:1135 0 InterfaceKit Screen.jpg|link=|400px]]
|
#In the Advanced Sensor Form, select the 1135 - Voltage Sensor from the drop down menu.
#The differential voltage measured by the sensor is shown here.
#Formula used to convert the analog input SensorValue into voltage.
|
[[File:1135 0 Advanced Sensor Form Screen.jpg|link=|400px]]
}}
 
===Testing Using Mac OS X===
 
{{UGmac| | }}
 
===Using Linux===
 
{{UGlinux}}
 
===Using Windows Mobile / CE 5.0 / CE 6.0===
 
{{UGce}}


==Technical Details==
==Technical Details==
===General===
===General===
The Voltage Sensor measures the differential voltage between the input terminals and outputs the difference proportionally. The maximum differential voltage that can be measured accurately is +/-30V. When the positive and negative inputs are equal, the analog output value is 2.5V. When the positive input is 30V greater than the negative input, the analog output is 4.5V and when the positive input is 30V less than the negative input, the analog output is 0.5V.
The 1135 measures the differential voltage between the input terminals and outputs the difference proportionally. The maximum differential voltage that can be measured accurately is ±30V. When the positive and negative inputs are equal, the voltage output value is 2.5V. When the positive input is 30V greater than the negative input, the voltage output is 4.5V and when the positive input is 30V less than the negative input, the voltage output is 0.5V.
 
When measuring voltage levels below 5V, you'll have more accuracy if you connect the leads directly to the [[Analog Input Primer|analog input]] of an interface kit.


Since the 1135 Voltage Sensor can measure a differential voltage, the common mode rejection (CMR) is an important specification. CMR refers to the amount of voltage that both input terminals of an differential amplifier can be offset without affecting the output gain. For example, if the positive terminal sees a voltage of 7V and the negative terminal sees a voltage of 5V, then the CMR would be 5V and would output a value of 2V at unity gain. For the 1135 Voltage Sensor, it is able to measure the differential voltage of +/-10V with a CMR of 40V while keeping the accuracy within 2%. Please note that the error specifications do not include the error introduced by the Analog to Digital Conversion on the Analog Input. (if you are using the 1135 with a PhidgetInterfaceKit)  The majority of error introduced by the Analog to Digital conversion is from the error in the voltage reference (0.5% max), and the limitation of resolution in the SensorValue property.  The best accuracy can be achieved by using a 2 or more point calibration of your
When measuring voltage levels below 5V, you'll have more accuracy if you connect the leads directly to the [[Phidgets_Connectors|voltage input]] of the HUB0000 (or {{CT|HasAI|compatible product}}).
system - effectively calibrating the 1135 and the PhidgetInterfaceKit in a single step.  If you are calibrating, be sure to use a good quality multimeter to determine the voltage being applied.


Using RawSensorValue in the formula will increase the resolution, which is limited by SensorValue to about 67mV.
Since the 1135 can measure a differential voltage, the common mode rejection (CMR) is an important specification. CMR refers to the amount of voltage that both input terminals of a differential amplifier can be offset without affecting the output gain. For example, if the positive terminal sees a voltage of 7V and the negative terminal sees a voltage of 5V, then the CMR would be 5V and would output a value of 2V at unity gain. For the 1135, it is able to measure the differential voltage of ±10V with a CMR of 40V while keeping the accuracy within 2%. Please note that the error specifications do not include the error introduced by the Analog to Digital Conversion on the Analog Input. (if you are using the 1135 with a PhidgetInterfaceKit)  The majority of error introduced by the Analog to Digital conversion is from the error in the voltage reference (0.5% max), and the limitation of resolution in the analog-to-digital converter.  The best accuracy can be achieved by using a 2 or more point calibration of your system - effectively calibrating the 1135 and the PhidgetInterfaceKit in a single step.  If you are calibrating, be sure to use a good quality multimeter to determine the voltage being applied.


===Formulas===
===Formulas===
The Formula to translate SensorValue into differential voltage is:
{{UGSensorFormula|differential voltage (V)}} The Formula to translate the analog voltage returned by the 1135 into differential voltage is:
 
 
::<math>V_{diff} =  \frac{\frac{SensorValue}{200} - 2.5}{0.0681}</math>
 


where V<sub>diff</sub> is defined as V<sub>positive</sub> - V<sub>negative</sub>.
::<math>V_{diff} =  \frac{V_sens - 2.5}{0.0681}</math>


{{UGotherint}}
where V<sub>diff</sub> is defined as V<sub>positive</sub> - V<sub>negative</sub>, and V<sub>sens</sub> is the voltage returned by the 1135. For maximum accuracy, measure the sensor voltage when measuring a 0V source and replace the "2.5" in this equation with the zero value that you've measured.


===Coding for your Sensor===
Phidget analog sensors do not have their own API, but instead their output is a voltage that is typically converted to a digital value and accessed through the SensorValue properties and events on a Phidget InterfaceKit. It is not possible to programmatically identify which sensor is attached to the Analog Input. Your application will need to apply the formula from this manual to the SensorValue to translate it into usable data. Please see the Phidget InterfaceKit product manual for code samples, an overview of its API, and a description of our architecture.


===Analog Input Cable Connectors===
{{UGasens}}
Each Analog Input uses a 3-pin, 0.100 inch pitch locking connector.  Pictured here is a plug with the connections labeled.  The connectors are commonly available - refer to the [[Analog Input Primer]] for manufacturer part numbers.


==Product History==
{{UGnext|}}
{{UGhist}}
{{UGrow|March 2010 |0 |N/A |Product Release }}

Latest revision as of 16:36, 7 June 2018


Getting Started

Welcome to the 1132 user guide! In order to get started, make sure you have the following hardware on hand:


Next, you will need to connect the pieces:

1135 0 Connecting The Hardware.jpg
  1. Connect the 1135 to the HUB0000 with the Phidget cable.
  2. Connect a voltage source to the 1135. If you connect the supply backwards, the reported voltage will be negative.
  3. Connect the HUB0000 to your computer with the USB cable.


Now that you have everything together, let's start using the 1135!

Using the 1135

Phidget Control Panel

In order to demonstrate the functionality of the 1135, we will connect it to the HUB0000, and then run an example using the Phidget Control Panel on a Windows machine.


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 1135.

First Look

After plugging in the 1135 into the HUB0000, and the HUB0000 into your computer, open the Phidget Control Panel. You will see something like this:

HUB0000 Panel.jpg


The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:

  • Serial number: allows you to differentiate between similar Phidgets.
  • Channel: allows you to differentiate between similar objects on a Phidget.
  • Version number: corresponds to the firmware version your Phidget is running. If your Phidget is listed in red, your firmware is out of date. Update the firmware by double-clicking the entry.


The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.

Voltage Input

Double-click on a Voltage Input object in order to run the example:

1018 Sensors VoltageInput.png


General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:

  • Modify the change trigger and/or data interval value by dragging the sliders. For more information on these settings, see the data interval/change trigger page.
  • Select the 1135 from the Sensor Type drop-down menu. The example will now convert the voltage into differential voltage (V) automatically. Converting the voltage to differential voltage (V) is not specific to this example, it is handled by the Phidget libraries, with functions you have access to when you begin developing!


Technical Details

General

The 1135 measures the differential voltage between the input terminals and outputs the difference proportionally. The maximum differential voltage that can be measured accurately is ±30V. When the positive and negative inputs are equal, the voltage output value is 2.5V. When the positive input is 30V greater than the negative input, the voltage output is 4.5V and when the positive input is 30V less than the negative input, the voltage output is 0.5V.

When measuring voltage levels below 5V, you'll have more accuracy if you connect the leads directly to the voltage input of the HUB0000 (or compatible product).

Since the 1135 can measure a differential voltage, the common mode rejection (CMR) is an important specification. CMR refers to the amount of voltage that both input terminals of a differential amplifier can be offset without affecting the output gain. For example, if the positive terminal sees a voltage of 7V and the negative terminal sees a voltage of 5V, then the CMR would be 5V and would output a value of 2V at unity gain. For the 1135, it is able to measure the differential voltage of ±10V with a CMR of 40V while keeping the accuracy within 2%. Please note that the error specifications do not include the error introduced by the Analog to Digital Conversion on the Analog Input. (if you are using the 1135 with a PhidgetInterfaceKit) The majority of error introduced by the Analog to Digital conversion is from the error in the voltage reference (0.5% max), and the limitation of resolution in the analog-to-digital converter. The best accuracy can be achieved by using a 2 or more point calibration of your system - effectively calibrating the 1135 and the PhidgetInterfaceKit in a single step. If you are calibrating, be sure to use a good quality multimeter to determine the voltage being applied.

Formulas

The Phidget libraries can automatically convert sensor voltage into differential voltage (V) by selecting the appropriate SensorType. See the Phidget22 API for more details. The Formula to translate the analog voltage returned by the 1135 into differential voltage is:

where Vdiff is defined as Vpositive - Vnegative, and Vsens is the voltage returned by the 1135. For maximum accuracy, measure the sensor voltage when measuring a 0V source and replace the "2.5" in this equation with the zero value that you've measured.


Phidget Cable

Analoginput.jpg

The Phidget Cable is a 3-pin, 0.100 inch pitch locking connector. Pictured here is a plug with the connections labelled. The connectors are commonly available - refer to the Analog Input Primer for manufacturer part numbers.

What to do Next

  • Programming Languages - Find your preferred programming language here and learn how to write your own code with Phidgets!
  • Phidget Programming Basics - Once you have set up Phidgets to work with your programming environment, we recommend you read our page on to learn the fundamentals of programming with Phidgets.