Calibration; Calibration Steps - Progress Direct Systems Volt Tattler 2 Owner's Manual

Calibration

Calibration requires 3 pieces of equipment commonly available to most hams and electronics
technicians:

the VoltTattler 2 module

a variable DC power supply capable of being adjusted from above the desired high threshold
down below the low threshold to be programmed

a high impedance voltmeter to confirm that the power supply is at the voltages to be
programmed*
* Meters that come on power supplies may not give the desired accuracy. In addition there could be
some drop between the power supply and VoltTattler 2. Knowing this you can decide to use the power
supply meter rather than a separate external voltmeter.

Calibration Steps

The DC calibration supply must be reasonably clean of hum and noise or significant error may occur in
calibration. Power supplies with a fine adjustment can improve the ability to set the voltage more
precisely.