At present, we are striving our best to become amongst the ideal exporters inside our industry to satisfy shoppers more want for Used Network Analyzer Agilent 8719ES, Used Keithley 6487, Used DC Power Module Agilent N6745B. We focus on the interests of users and strive to create all kinds of opportunities to obtain their maximum satisfaction with the product. We have always established long-term friendly trade relations with customers on the basis of equality and mutual benefit. We abide by the promise to customers and the ethical standards, and we won't harm the interests of the customers.
A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency counters usually measure the number of cycles of oscillation, or pulses per second in a periodic electronic signal. Such an instrument is sometimes referred to as a cymometer, particularly one of Chinese manufacture
Most frequency counters work by using a counter which accumulates the number of events occurring within a specific period of time. After a preset period known as the gate time (1 second, for example), the value in the counter is transferred to a display and the counter is reset to zero. If the event being measured repeats itself with sufficient stability and the frequency is considerably lower than that of the clock oscillator being used, the resolution of the measurement can be greatly improved by measuring the time required for an entire number of cycles, rather than counting the number of entire cycles observed for a pre-set duration (often referred to as the reciprocal technique). The internal oscillator which provides the time signals is called the timebase, and must be calibrated very accurately.
If the event to be counted is already in electronic form, simple interfacing to the instrument is all that is required. More complex signals may need some conditioning to make them suitable for counting. Most general purpose frequency counters will include some form of amplifier, filtering and shaping circuitry at the input. DSP technology, sensitivity control and hysteresis are other techniques to improve performance. Other types of periodic events that are not inherently electronic in nature will need to be converted using some form of transducer. For example, a mechanical event could be arranged to interrupt a light beam, and the counter made to count the resulting pulses.
Frequency counters designed for radio frequencies (RF) are also common and operate on the same principles as lower frequency counters. Often, they have more range before they overflow. For very high (microwave) frequencies, many designs use a high-speed prescaler to bring the signal frequency down to a point where normal digital circuitry can operate. The displays on such instruments take this into account so they still display the correct value. Microwave frequency counters can currently measure frequencies up to almost 56 GHz. Above these frequencies the signal to be measured is combined in a mixer with the signal from a local oscillator, producing a signal at the difference frequency, which is low enough to be measured directly.
Single-mindedness and excellence are our core values. At a new starting point, we are willing to continue to make unremitting efforts for the development of Suin Benchtop 150MHz/200MHz 8-10 Digits/S Ss7001 Series Frequency Counter with High Speed of Data Processing. We take quality as life, pursuing product excellence as our brand management. 'Passion, Honesty, Sound services, Keen cooperation and Development' are our goals.
Hot Tags: frequency counters, China, manufacturers, Suppliers, Factory, buy, low price, in stock, Used Oscilloscope Tektronix DPO4104B L, Used High Power SourceMeter Keithley 2651A, Used Network Analyzer Agilent N5239A, Used Wireless Connectivity Test Agilent N4010A, Used Network AnalyzerRohde Schwarz ZVA50, Used Spectrum Analyzer Agilent E4407B
