• Sencore is a company which engineers and develops signal transmission solutions and equipment. In addition to frequency counters, Sencore manufactures broadcast equipment, monitoring and analysis technology, and offers professional field services. The Sencore FC71 is a digital portable frequency counter. Frequency counters are electronic instruments that provide concise measurements of the frequency of input signals from various devices, and are used in factories, laboratories and field environments. The Sencore FC71 measures frequencies between 10 Hz to 1 GHz.
  
  

Input

• The counter has a total of three adjustable inputs. The sensitivity control function is used to reduce the sensitivity on noisy signals, which provides a more stable reading. The one megaohm high impedance input minimizes circuit loading and has a high level of sensitivity. The second input reduces cable ringing from high frequency signals, and is terminated in 50 ohms. The third input, which is trade named Crystal Check, is a technology exclusive to Sencore. It allows any crystal to be inserted into the front test panel to be checked for activity.
  
  

Battery and Display

• The frequency counter runs on a 12 volt battery. It can run on a single battery charge for a full day. The counter does not need to be warmed before use. It maintains accuracy throughout a wide range of temperatures. An annunciator, or indicator, monitors the battery's condition. A second indicator warns if there is an overload that has damaged the input fuse. The digital display type is 8V2. The display can be read in most lighting conditions.
  
  

Resolution

• The FC71 is a direct reading counter. The resolution of direct reading counters is determined by what is known as gate time. Gate time refers to the length of time that the numbers of pulses or transition crossings are being counted. The Sencore F71 frequency counter offers a choice of two gate times. The faster update allows for troubleshooting and the slower update provides additional resolution. The slower gate time is used for most precise readings.