The Visionary Sound Company

Testing and Calibrating

Connect a 9V battery and turn on.  The Green LED should light up.  Hold down the test button and you should be able to hear a tone.  Don't worry, it may be quite nasty!

To calibrate the unit put a A/C voltmeter across pins two and three of the left most male XLR when looking at the back.  This XLR is the oscillator out.  Adjust the left-hand trimmer until the voltage reads about 1.2V.  Turn the meter to read frequency and adjust the right-hand trimmer until it reads nearly 440Hz.

The left-hand trimmer is your dB adjustment and the right-hand trimmer is your Hz adjustment.  An easy way to remember this is that 'Level Hurts (Hertz)!'.

Both trimmers slightly affect each other so you will need to repeat this process until the voltage reads 1.23V and the frequency is 440Hz.

If you do not have a meter that can read frequency do not despair!  Find a piano and play middle A (the A below middle C).  Hold the ClipCop up to your ear and hold down the test button to hear the tone.  Adjust the right trimmer until the tone and the piano sound the same.