Frequency Counters

What is a Frequency Counter?

A frequency counter is an electronic instrument that is used for measuring frequency. They usually measure the number of oscillations or pulses per second in a periodic electronic signal. The frequency counter is simple to use, you just turn the counter on and apply the signal to the input. They can be used for measuring many signals from digital logic signals to RF and microwaves.

General guidelines on using a Frequency Counter

• Do not overload input: This may occur when using some RF frequency counters that may have a 50Ω input.
• Keep frequency counter time-base / clock warm: The time-base of clock within a frequency counter governs the overall accuracy of the instrument.
• Requires accurate time-base: As the accuracy of the time-base directly reflects onto the accuracy of the measurement, it is necessary to use an instrument with an accurate time-base, or use an external one that is very accurate.
• Calibrate: With various aspects such as crystal ageing that affects even the most accurate crystal- based clock oscillators or time-bases, it is necessary to ensure that the time-base frequency is maintained as accurately as possible and all other functions are operating within their specified ranges.
• For noisy signals, pay attention to trigger error: When using a frequency counter or timer with a noisy signal, the noise can cause spurious counts which affects the reading.
• Lock all time-bases to a single clock: When a system uses several time-bases, there are possibilities of uncertainty between the signals that can cause some inaccuracies. To overcome this, it is often wise to lock all the elements of a system to a single accurate time-base.
Applications include:
• Measuring the frequency of a transmitter carrier
• Measuring the frequency of an oscillator in a circuit
• Measure the frequency of a signal on a line
• Any application where the frequency of a steady repetitive signal needs to be measured
To be able to measure the frequency of an RF signal using a frequency counter there are a few prerequisites.
• Frequency must be steady, i.e. not varying
• The signal should not have modulation applied as this prevents proper counting
• Signal must have sufficient amplitude – typically signals over about half a volt are suitable
• Signals should not be so large that they overload the input
Frequency counters are an easy to use test instrument, have few problems and give accurate results.
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Täpsem kirjeldus Brand Stock Maximum Frequency Minimum Frequency Resolution Pulse Width Resolution Attenuation Maximum Internal Counter Maximum Input Voltage Measurement Time Connector Type Dimensions Model Number p Width Length Weight Height Plug Type Maximum Operating Temperature Minimum Operating Temperature
Aim-TTi TF930 Frequency Counter 3GHz Aim-TTi 18 3GHz 0.001 Hz 10 Digit 20ns 1:1, 5:1 9999999999 30V ac/dc - - 235 x 260 x 88mm TF930 260mm 235mm 950g 88mm Type C - European Plug, Type G - British 3-pin +40°C +5°C
Aim-TTi PFM3000 Frequency Counter 3GHz Aim-TTi 8 3GHz 3 Hz 6 Digit - - 188888888 30V ac/dc 10s - 178 x 81 x 30mm PFM3000 81mm 178mm 190g 30mm - +40°C +5°C
Tektronix FCA3100 Frequency Counter 300MHz Tektronix 5 300MHz 0.001 Hz 12 Digit 1.6ns 1:10 - 5 V, 50 V 250ksps BNC, SMA, Type-N Female 395 x 210 x 90mm FCA3100 210mm 395mm 2.7kg 90mm Type C - European Plug, Type G - British 3-pin, Type J - Swiss 3-pin +50°C 0°C
Aim-TTi TF960 Frequency Counter 6GHz Aim-TTi 4 6GHz 0.001 Hz 10 Digit 20ns 1:1, 5:1 9999999999 30V 100s Type-N 260 x 235 x 88mm TF960 235mm 260mm 950g 88mm - +40°C +5°C
Tektronix FCA3000 Frequency Counter 300MHz Tektronix 4 300MHz 0.001 Hz 12 Digit 1.6ns 1:10 - 5 V, 50 V 250ksps BNC, SMA, Type-N Female 395 x 210 x 90mm FCA3000 210mm 395mm 2.7kg 90mm Type C - European Plug, Type G - British 3-pin, Type J - Swiss 3-pin +50°C 0°C
Rohde & Schwarz HM8123 Frequency Counter 3GHz Rohde & Schwarz 0 3GHz 0 Hz 10 Digit 5ns 1:1, 1:10, 1:100 - 250 V, 5 V - BNC, SMA 365 x 285 x 75mm HM8123 285mm 365mm 4kg 75mm - +40°C +5°C
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