Frequency Counters

What is a Frequency Counter?
• 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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Part Details Brand 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 Height Weight Plug Type Maximum Operating Temperature Minimum Operating Temperature
Aim-TTi TF930 Frequency Counter 3GHz Aim-TTi 3GHz 0.001 Hz 10 Digit 20ns 1:1, 5:1 9999999999 30V ac/dc - - 235 x 260 x 88mm TF930 260mm 235mm 88mm 950g Type C - European Plug, Type G - British 3-pin +40°C +5°C
Aim-TTi PFM3000 Frequency Counter 3GHz Aim-TTi 3GHz 3 Hz 6 Digit - - 188888888 30V ac/dc 10s - 178 x 81 x 30mm PFM3000 81mm 178mm 30mm 190g - +40°C +5°C
Tektronix FCA3000 Frequency Counter 300MHz Tektronix 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 90mm 2.7kg Type C - European Plug, Type G - British 3-pin, Type J - Swiss 3-pin +50°C 0°C
Tektronix FCA3100 Frequency Counter 300MHz Tektronix 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 90mm 2.7kg 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 6GHz 0.001 Hz 10 Digit 20ns 1:1, 5:1 9999999999 30V 100s Type-N 260 x 235 x 88mm TF960 235mm 260mm 88mm 950g - +40°C +5°C
Rohde & Schwarz HM8123 Frequency Counter 3GHz Rohde & Schwarz 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 75mm 4kg - +40°C +5°C
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