Products for USB Sensing and Control
Products for USB Sensing and Control

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## 30 Amp Current Sensor AC/DC

ID: 1122_0
Mature: This product (or a similar replacement with a compatible form, fit and function) will be produced as long as the parts and components required to make it are available.

Measure up to 30 amps DC or ±30 amps AC with this current sensor. Connects to an Analog Input or VINT Hub port.

## $31.00 Quantity Available: 1000+ Qty Price 5$29.45
10 $27.90 25$24.80
50 $21.70 100$20.15

The 1122 measures AC current up to 30 Amps and DC Current from -30Amps to +30Amps. Dual outputs allow the user to measure both the AC and DC components of complex current waveforms separately.

#### Interface Boards and Hubs

This sensor can be read by any Phidget with an Analog Input or VINT Hub port. It will connect to either one using the included Phidget cable. VINT Hub ports can behave just like Analog Inputs, but have the added flexibility of being able to be used as digital inputs, digital outputs, or ports to communicate with VINT devices. For more information about VINT, see the VINT Primer.

Product Voltage Inputs
Image Part Number Price Number of Voltage Inputs Voltage Input Resolution
1010_0 $80.00 8 10 bit 1011_0$50.00 2 10 bit
1018_2B $80.00 8 10 bit 1019_1B$110.00 8 10 bit
1203_2B $70.00 8 10 bit DAQ1000_0$20.00 8 12 bit
HUB0000_0 $30.00 6 (Shared) * 16 bit SBC3003_0$120.00 6 (Shared) * 16 bit

#### Phidget Cables

This sensor comes with its own Phidget cable to connect it to an InterfaceKit or Hub, but if you need extras we have a full list down below. 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 Physical Properties
Image Part Number Price Cable Length
3002_0 $2.00 600 mm 3003_0$1.50 100 mm
3004_0 $3.00 3.5 m 3034_0$1.50 150 mm
3038_0 $2.25 1.2 m 3039_0$2.75 1.8 m

## Getting Started

Welcome to the 1122 user guide! In order to get started, make sure you have the following hardware on hand:

Next, you will need to connect the pieces:

1. Connect the 1122 to the HUB0000 with the Phidget cable.
2. To measure alternating current, you can either use the DC port to measure a peak-to-peak AC signal, or you can use the AC port to measure the RMS value. To measure direct current, either the AC port or the DC port will work, since RMS calculations will have no effect on a DC signal.
3. Connect the current-carrying wire into the terminals of the current sensor, paying attention to polarity. For safety, ensure that the wire is not powered until you're finished connecting everything.
4. Connect the HUB0000 to your computer with the USB cable.

Now that you have everything together, let's start using the 1122!

## Using the 1122

### Phidget Control Panel

In order to demonstrate the functionality of the 1122, 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:

### First Look

After plugging in the 1122 into the HUB0000, and the HUB0000 into your computer, open 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:

• 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 Ratio Input

Double-click on a Voltage Ratio Input object 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:

• 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 1122 from the Sensor Type drop-down menu. The example will now convert the voltage into amperage (A) automatically. Converting the voltage to amperage (A) 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 1122 measures alternating current (AC) up to 30 Amps and direct current (DC) between –30 and +30 Amps. It uses a Hall effect based sensor to measure the magnetic field induced by the applied current flowing through a copper conductor. It then converts the magnetic data into a current measurement with internal calculations. The AC output will give the root mean square (RMS) value of an alternating current assuming the current is sinusoidal, and the sine wave is varying equally across the zero point. The AC output can also be used for signals that are not varying evenly around the zero point but the value will be the RMS plus a DC component. If a DC signal is being measured, the AC output will produce a signal that can be used to calculate the current but without the value representing direction of current flow.

### Measuring Current

The 1122 should be wired in series with the circuit under test, as shown in the following diagrams:

In the diagrams above, the voltage source is represented by the battery symbol. The load is represented by a light bulb or schematic resistor symbol. The current flowing from the battery to the load is measured through the current sensor.

### Formulas

The Phidget libraries can automatically convert sensor voltage into amperage (A) by selecting the appropriate SensorType. See the Phidget22 API for more details. The formula to translate voltage ratio from the sensor into amperage is:

${\displaystyle {\text{DC Current (A)}}=({\text{VoltageRatio}}\times 75.76)-37.8787}$

${\displaystyle {\text{AC Current (RMS)}}={\text{VoltageRatio}}\times 42.04}$

### Phidget Cable

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

• Software Overview - Find your preferred programming language here and learn how to write your own code with Phidgets!
• Phidget22 API - The API is a universal library of all functions and definitions for programming with Phidgets. Just select your language and device and it'll give you a complete list of all properties, methods, events, and enumerations that are at your disposal.

This device doesn't have an API of its own. It is controlled by opening a VoltageRatioInput channel on the Phidget that it's connected to. For a list of compatible Phidgets with VoltageRatio Inputs, see the Connection & Compatibility tab.

You can find details for the VoltageRatioInput API on the API tab for the Phidget that this sensor connects to.

#### Product Specifications

Sensor Properties
Sensor Type Current (AC/DC In-Line)
Controlled By VoltageRatio Input
Sensor Output Type Ratiometric
Input Current Min ± 75 mA
Input Current Max ± 30 A
Surge Current (Input) 100 A
Measurement Error Max 5 %
Sensor Response Time Max 10 ms
Electrical Properties
Input Frequency 10 kHz
Supply Voltage Min 4.5 V DC
Supply Voltage Max 5.5 V DC
Current Consumption Max 10 mA
Output Impedance 1 kΩ
Input Impedance 1.5 mΩ
Output Voltage Min 0 V DC
Output Voltage Max 5 V DC
Physical Properties
Recommended Wire Size 10 - 26 AWG
Operating Temperature Min -40 °C
Operating Temperature Max 85 °C

#### Product History

Date Board Revision Device Version Comment
March 2008 0 N/A Product Release

#### Here's a list of our current sensors:

Product Sensor Properties
Image Part Number Price Sensor Type Controlled By Input Current Min Input Current Max Current Measurement Resolution
1122_0 $31.00 Current (AC/DC In-Line) VoltageRatio Input ± 75 mA ± 30 A 3500_0$40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 10 A 10 mA
3501_0 $40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 25 A 25 mA 3502_0$40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 50 A 50 mA
3503_0 $40.00 Current (AC Through-Hole) Voltage Input (0-5V) 0 A 100 A 100 mA 3511_0$95.00 Current (DC In-Line) Voltage Input (0-5V) 0 A 10 mA
3513_0 $95.00 Current (DC In-Line) Voltage Input (0-5V) 0 A 1 A 3584_0$40.00 Current (DC Through-Hole) ±12V Adapter 0 A 50 A 50 mA
3585_0 $35.00 Current (DC Through-Hole) ±12V Adapter 0 A 100 A 100 mA 3586_0$35.00 Current (DC Through-Hole) ±12V Adapter 0 A 250 A 250 mA
3587_0 $40.00 Current (DC Through-Hole) ±12V Adapter -50 A 50 A 100 mA 3588_0$35.00 Current (DC Through-Hole) ±12V Adapter -100 A 100 A 200 mA
3589_0 $35.00 Current (DC Through-Hole) ±12V Adapter -250 A 250 A 500 mA VCP1100_0$25.00 Current (DC In-Line Hall Effect) VINT -30 A 30 A 1.1 mA