I need a solution to the question, Which clamp-around-the-cable ammeter (digital or analog) can be trusted in measurement of current draw by a high-frequency AC tig welder? High-frequency AC is a requirement of welding aluminum, and an electrician measured 150+ amps at full power welding aluminum. A serviceman brought in to find the problem told us, after checking the machine, that high frequency creates error in digital ammeters and his analog meter indicated 105 amps in a duplicate situation. We might have left it at that but are being told (by an engineer) that the digital reading was correct and we have to take the welder offline. Help!