Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: What is the input impedance?
Review: It may be a wonderful instrument, but the on-line specifications are not sufficient to know whether I could use it for my intended purpose.I want an instrument that I can use for vacuum tube circuits. Because of the high resistances used with vacuum circuits, if a volt meter draws significant current, it will disturb the circuit making it impossible to get accurate readings. That is why traditionally vacuum tube voltmeters (VTVMs) were used with vacuum tube circuits.It may be that this instruments has a high enough input impedance, but it is impossible to tell from the on-line specifications. Because the information is inadequate, I have given it a 1-star rating.
