Digital or electronic frequency counters measure signals on a wide range of radio frequencies, usually in digital systems and/or computers. Also known as RF counters, digital frequency counters are ideal for accurately measuring RF signals or vibration levels, or to calibrate other equipment like signal generators that don't have their own digital displays.

Frequency counters for sale differ in frequency ranges and the number of digits that can be displayed. The greater the frequency range and digit-display, the greater the price. Price is also impacted by the options you choose, like extra channels or time bases to improve stability due to time or temperature changes, or mounting/connection kits.

As with other electronic devices, the fewer the bells and whistles, the lower the cost. This article can help you find a digital frequency counter or electronic frequency counter that meets your needs by following three steps:

1. Find manufacturers of electronic and digital frequency counters.

2. Determine the accuracy of the reading you require in your electronic frequency counter.

3. Decide how wide a range your RF counter must measure.

Action Steps
The best contacts and resources to help you get it done

Find manufacturers of electronic and digital frequency counters

There are several options to choose from when searching for frequency counters. They include readout displays, single or double channels and frequency range. You can even choose between hand-held frequency counters or traditional stationary models. The variety of choices are all the more reason to browse through several websites to determine which manufacturer or model can meet your needs.

I recommend: Direct Industry's website lists companies all over the world that manufacture frequency counters. MetricTest features listings of refurbished and new frequency counters for sale or rental.

Determine the accuracy of the reading you require in electronic frequency counters

The more digits available on the digital display, the more accurate the reading. While some frequency counters are manufactured with six digit displays, it is more common to see models with either 10- or 12-digit readouts.

I recommend: Laurel Electronics carries standard and extended frequency counters with six digit displays. Hensley Technologies carries frequency counters with 10- and 12-digit readout displays.

Decide how wide a range RF counters must measure to meet your equipment needs

Frequency counters come in a variety of ranges for measurement in even the most sensitive equipment. It bears repeating that the greater your range measurement requirements the more money you will need to spend.

I recommend: B&K Precision manufactures frequency counters with measuring ranges anywhere from 200 MHz to 3.5 GHz. You have greater range measurement options with TESSCO Technologies, which offers frequency counter models measuring 1.5-t0-12.4 GHz.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  While not their intended purpose, frequency counters can even be used to tune musical instruments. All you need is a microphone and a reference table of musical note frequencies. By attaching a microphone to the frequency counter it can display the exact frequency being played on a guitar, piano or any other instrument.