The 1054 - PhidgetFrequencyCounter is designed to count events from an analog signal over time and calculate a frequency from it. The product can count a logic level or signal centered around zero volts. Signals with a different ground can be counted, provided they are within the common mode range (±10V).
The Frequency Counter can also power small devices, such as Hall effect, flow rate sensors, tachometers, and other sensors.
The PhidgetFrequencyCounter contains two channels to sense two different inputs. Each channel has two different circuits to sense for logic level-frequencies or zero-centered frequencies. The measurable frequency is accurate to 0.25% up to 1MHz. The Frequency Counter may measure frequencies past 1 Mhz, but the input voltage specifications will not hold.
The PhidgetFrequencyCounter can measure frequencies down to ~ 0.01Hz. However the response time of these measurements is directly related to the frequency, thus it could take 1 or 2 periods(100-200s) to detect the input frequency.
|API Object Name||FrequencyCounter|
|Number of Channels||2|
|Frequency Error Max||0.25 %|
|Input Frequency Max||1 MHz|
|Frequency Input Voltage Max||± 20 V DC|
|Amplitude Min (Zero-Centered Input)||110 mV DC|
|Hysteresis (Zero-Centered Input)||± 30 mV DC|
|Ground Offset Min||-6.3 V DC|
|Ground Offset Max||10.3 V DC|
|Low Voltage Max (False)||800 mV DC|
|High Voltage Min (True)||3 V DC|
|USB Voltage Min||4.8 V DC|
|USB Voltage Max||5.3 V DC|
|USB Speed||Full Speed|
|Current Consumption Max||42 mA|
|Available External Current||450 mA|
|Input Impedance||(30pF) 332 kΩ|
|Recommended Wire Size||16 - 26 AWG|
|Operating Temperature Min||0 °C|
|Operating Temperature Max||70 °C|
|Frequency Input||FrequencyCounter||0 - 1|
|FrequencyCounter||Visual Basic .NET||Windows||Download|
|Date||Board Revision||Device Version||Comment|
|May 2011||0||100||Product Release|
|May 2011||0||101||getLabelString fixed for labels longer than 7 characters|
Welcome to the 1054 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 1054!
In order to demonstrate the functionality of the 1054, 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 1054.
After plugging the 1054 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 Frequency Counter 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:
The 1054 contains two channels to sense two different inputs. Each channel has two different circuits to sense for logic level-frequencies or zero-centered frequencies. The measurable frequency is accurate to 0.25% up to 1MHz. The 1054 may measure frequencies past 1MHz, but the input voltage specifications will not hold. The 1054 can measure frequencies down to ~0.01Hz. However the response time of these measurements is directly related to the frequency, thus it could take 1 or 2 periods(100-200s) to detect the input frequency.
The logic-level sensing circuit has a hysteresis range from 0.9V to 2.4V. This will allow the circuit to count both 3.3V and 5V logic levels. In addition to logic-level signals, this will also accept the pulses from sensors with open collector outputs. When the input signals are either 3.3V or 5V, the maximum sensed frequency is 1.5MHz. Most digital sensors that are powered from a signal positive power supply will output a logic-level frequency.
The zero-centered sensing circuit can be used for input signals where you want to count as it crosses zero volts. A hysteresis of 30mVpp filters noise. At maximum frequency (1MHz), a signal of 400mVPP is required for reliable counting. A common application that uses a zero centered frequency output is a simple magnetic tachometer, which produces a sine wave around 0 volts.
The 1054 uses differential inputs, that is, the voltage being compared is the difference between the + and - inputs. If your application has a slightly different ground from your USB ground, the common mode rejection in the 1054 will handle small differences in ground. For many applications, the signal being measured is single ended, that is, your sensor outputs only one signal, and you can directly connect the ground of the sensor to the ground of the 1054. In this case, ensure the - input is tied to ground. Never allow either input to be left unconnected.
USB Voltage is passed directly to the +5V terminal on the green blocks.
You can protect your board from dust and debris by purchasing an enclosure. An enclosure will also prevent unintentional shorts caused by objects touching the pins on the bottom of the board or any terminal screws.
You can use a USB Isolator to increase your system stability by eliminating problems caused by ground voltage differences between your computer and the device.
|Image||Part Number||Price||Isolation Voltage (DC)|
|3060_0||$58.30||1 kV DC|
Use a USB cable to connect this Phidget to your computer. We have a number of different lengths available, although the maximum length of a USB cable is 5 meters due to limitations in the timing protocol. For longer distances, we recommend that you use a Single Board Computer to control the Phidget remotely.