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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Description Price Maximum Frequency Minimum Frequency Resolution Calibrated Pulse Width Resolution Attenuation Maximum Internal Counter Minimum Internal Counter Maximum Input Voltage Minimum Input Voltage Input Impedance Measurement Time Connector Type Dimensions
RS Stock No. 810-6305
Mfr. Part No.TF930
BrandAim-TTi
kr 4 162,02
Each
Units
3GHz 0.001 Hz 10 Digit RSCAL 20ns 1:1, 5:1 9999999999 1 30V ac/dc - 1 MΩ, 50 Ω - - 235 x 260 x 88mm
RS Stock No. 810-6314
Mfr. Part No.TF930
BrandAim-TTi
kr 4 528,02
Each
Units
3GHz 0.001 Hz 10 Digit UKAS 20ns 1:1, 5:1 9999999999 1 30V ac/dc - 1 MΩ, 50 Ω - - 235 x 260 x 88mm
RS Stock No. 665-4919
Mfr. Part No.TF930
BrandAim-TTi
kr 3 649,02
Each
Units
3GHz 0.001 Hz 10 Digit - 20ns 1:1, 5:1 9999999999 1 30V ac/dc - 1 MΩ, 50 Ω - - 235 x 260 x 88mm
RS Stock No. 622-3265
Mfr. Part No.HM8123
kr 18 585,00
Each
Units
3GHz 0 Hz 10 Digit - 5ns 1:1, 1:10, 1:100 - - 250 V, 5 V - 1 MΩ, 50 Ω - BNC, SMA 365 x 285 x 75mm
RS Stock No. 192-5828
Mfr. Part No.HM8123
kr 19 098,00
Each
Units
3GHz 0 Hz 10 Digit RSCAL 5ns 1:1, 1:10, 1:100 - - 250 V, 5V - 1 MΩ, 50 Ω - BNC, SMA 365 x 285 x 75mm
RS Stock No. 192-5829
Mfr. Part No.HM8123
kr 19 464,00
Each
Units
3GHz 0 Hz 10 Digit UKAS 5ns 1:1, 1:10, 1:100 - - 250 V, 5V - 1 MΩ, 50 Ω - BNC, SMA 365 x 285 x 75mm
RS Stock No. 712-8953
Mfr. Part No.53220A
kr 24 829,83
Each
Units
350MHz 0 Hz 12 Digit RSCAL 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 713-4295
Mfr. Part No.53220A
kr 24 316,83
Each
Units
350MHz 0 Hz 12 Digit - 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 712-8956
Mfr. Part No.53220A
kr 25 195,83
Each
Units
350MHz 0 Hz 12 Digit UKAS 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 712-8962
Mfr. Part No.53230A
kr 38 319,24
Each
Units
350MHz 0 Hz 12 Digit RSCAL 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 712-8966
Mfr. Part No.53230A
kr 38 685,24
Each
Units
350MHz 0 Hz 12 Digit UKAS 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 712-8947
Mfr. Part No.53210A
kr 21 975,52
Each
Units
350MHz 0 Hz 10 Digit UKAS 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 713-4286
Mfr. Part No.53210A
kr 21 096,52
Each
Units
350MHz 0 Hz 10 Digit - 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 487-864
Mfr. Part No.PFM3000
BrandAim-TTi
kr 2 237,81
Each
Units
3GHz 3 Hz 6 Digit RSCAL - - 188888888 - 30V ac/dc - 1 MΩ, 50 Ω 10s - 178 x 81 x 30mm
RS Stock No. 768-3441
Mfr. Part No.TF960
BrandAim-TTi
kr 4 895,27
Each
Units
6GHz 0.001 Hz 10 Digit - 20ns 1:1, 5:1 9999999999 1 30V - 1 MΩ, 50 Ω 100s Type-N 260 x 235 x 88mm
RS Stock No. 711-8892
Mfr. Part No.FCA3000
BrandTektronix
kr 29 085,36
Each
Units
300MHz 0.001 Hz 12 Digit UKAS 1.6ns 1:10 - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω 250ksps BNC, SMA, Type-N Female 395 x 210 x 90mm
RS Stock No. 712-1154
Mfr. Part No.FCA3000
BrandTektronix
kr 28 206,36
Each
Units
300MHz 0.001 Hz 12 Digit - 1.6ns 1:10 - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω 250ksps BNC, SMA, Type-N Female 395 x 210 x 90mm
RS Stock No. 712-8938
Mfr. Part No.53210A
kr 21 609,52
Each
Units
350MHz 0 Hz 10 Digit RSCAL 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 713-4298
Mfr. Part No.53230A
kr 37 806,24
Each
Units
350MHz 0 Hz 12 Digit - 40ns - - - 5 V, 50 V -50 V, -5 V 1 MΩ, 50 Ω - BNC 261.2 x 302.2 x 103.8mm
RS Stock No. 457-730
Mfr. Part No.PFM3000
BrandAim-TTi
kr 1 724,81
Each
Units
3GHz 3 Hz 6 Digit - - - 188888888 - 30V ac/dc - 1 MΩ, 50 Ω 10s - 178 x 81 x 30mm
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