View source for 1054 User Guide

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<metadesc>The PhidgetFrequencyCounter measures a signal's frequency and powers small devices like Hall Effect sensors, flow rate sensors, and tachometers.</metadesc>
[[Category:UserGuide]]
==Getting Started==
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*[{{SERVER}}/products.php?product_id=1054 1054 Frequency Counter Phidget]
*USB cable and computer
*something to use with the 1054 (e.g. a device with a frequency/pulse output)


Next, you will need to connect the pieces:
[[Image:1054_0_Connecting_The_Hardware.jpg|500px|right|link=]]
# Connect your pulse output device to the Frequency Counter Phidget. Connect the power wire to 5V, the ground wire to G, and the positive and negative data lines to '+' and '-'. If there is only one data line, connect it to '+' if it's a PNP sensor, and '-' if it's NPN.
# Connect the 1054 to your computer using the USB cable.

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==Using the 1054==
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*Modify the data interval value by dragging the slider. For more information on this setting, see the [[Data_Rate_and_Change_Trigger|data interval]] page.
*Enter a filter type from the Filter Type drop-down menu. A Logic Level signal goes from alternates between 0 and VCC. A Zero Crossing signal goes from -VCC to VCC.
*Toggle the Enabled checkbox to enable/disable the 1054.

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{{ugUsingYourOwnProgram|This Phidget is compatible with the {{ExampleLink|FrequencyCounter}}.}}

==Technical Details==
===General===
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. 

===Logic-Level Frequencies===
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.

===Zero-Centered Frequencies===
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.

===Differential Inputs===
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.

===Output Voltage===
USB Voltage is passed directly to the +5V terminal on the green blocks.

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