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BeВ very careful not to disturb R1вЂ™s setting as you unplug the signal generator and amplifier input from the test jig.Д¦. Rotate R1 until the meter reads exactly 50% of what it did in step 3.ДҐ. Try for a signal generator level between 1 and 2 volts AC but be careful not to overload the effect and cause clipping.Д¤. The polarity doesnвЂ™t matter since weвЂ™re measuring AC signals. Measure the signal generator level by clipping the VOM leads to test points 1 and 2. You may later need to switch to a more sensitive range (e.g., 2.5V or so) if the test oscillator signal isnвЂ™t strong enough for the meter to give a reliable reading.ДЈ. Set the VOM to the 10V AC range so it can measure audio signals. Plug in the signal generator and amplifier (or other device being tested), then perform the following steps.ДЇig. 2, which consists of a 1 Meg linear taper pot and two 1/4' phone jacks. (Just clipping an ohmmeter across a dummy plug inserted in the input jack isnвЂ™t good enough the input will usually be capacitor-coupled, making it impossible to measure resistance without taking the deviceвЂ™s cover off.) So, if we can determine the effectвЂ™s input resistance to ground, weвЂ™re covered. This test takes advantage of the fact that input impedance and resistance are, at least for this application, roughly equivalent. The trick is finding out which devices are guitar-friendly, and which arenвЂ™t you have to be particularly careful with processors designed for the studio, as there may be enough gain to kick the meters into the red but not a high enough input impedance to preserve your tone. Thus, low frequency signals may not be attenuated that much, but high frequencies could get clobbered.Д«uffer boards and on-board preamps can turn the guitar output into a low impedance output for all frequencies, but many devices are already designed to handle guitars, so adding anything else would be redundant. The reason why a low input impedance 'dulls' the sound is because a guitar pickupвЂ™s output impedance changes with frequency-at higher frequencies, the guitar pickup exhibits a higher output impedance. Conversely, a high guitar output impedance and low amp input impedance creates a lot of loss. If the guitarвЂ™s output impedance is low and the amp input impedance is high, thereвЂ™s very little loss. 1: The rough equivalentВ of impedance, expressed as resistance. If you draw an equivalent circuit for these two resistances, it looks suspiciously like the schematic for a volume control (Fig.

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The guitarвЂ™s output impedance, which is equivalent to putting a resistance in series with your guitar and the amp input, works in conjunction with the input impedance to impede the signal. The lower the resistance to ground, the greater the amount of signal that gets shunted. Input Impedance is a pretty complex subject, but we can just hit the highlights for the purposes of this article.ДЄn amp or effectвЂ™s input impedance essentially drapes a resistance from the input to ground, thus shunting some of your signal to ground. If you can, though, stay tuned since guitar input impedance crops up a lot if you work with electronic devices. If theory scares you, skip ahead to the next subhead. YouвЂ™ll also need a steady test tone generator, which can be anything from an FM tuner emitting a stream of white noise to a synthesizer set for a constant tone (or even a genuine test oscillator). This is one piece of test equipment no guitarist should be without anyway, as you can test anything from whether your stage outlets are really putting out 117V to whether your cable is shorted. You may be able to find a good digital model that cost less than $40. YouвЂ™ll need a standard issue analog or digital volt-ohmmeter (VOM), as sold by electronics stores, and other online stores. You might think that testing for input impedance is pretty esoteric, and that you need an expensive impedance tester, or at least have to find one of those matchbooks that says, вЂњLearn Electronics at Home in Your Spare Time.вЂќ But in this case, testing for guitar impedance is pretty simple.

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This article will outline how to test guitar impedance so you can achieve the best sound possible. ItвЂ™s all a question of the inputвЂ™s impedance, so letвЂ™s look at a simple test for determining whether that amp or signal processor youвЂ™re feeding is a signal coddler or a signal stomper. A guitar pickup puts out relatively weak signals, and the input it feeds can either coddle those signals or stomp on them. Is your guitar sounding run down, tired, dull, and anemic? It may not have the flu but be feeding the wrong kind of input. Anderton | JPrevent 'tone suckage' with this simple test procedure

How to write test tone generator