Review on 🔧 Innova 3340 Pro Auto Digital Multimeter by Victor Ahmed

spark plug wires; direct primary voltage regulation for COP (Coil on Plug) systems; traditional old-school tachometer readings for distribution systems (for a wide range of cylinder numbers); and DIS or depleted spark systems. And of course the measurement of the departure angle. Most modern car counters don't use all measurement methods except inductive, but I'd like to have more options. Volt. It is very good. If DC voltage is selected, the display will show 200-300 mV when no measurement is taken. This is due to internal noise from the autoranging circuitry. When I touch the probes together, the display resets. As I said, the DC voltage measurements I took were very accurate. I compared the resistance values between the 3340a and Fluke for various resistors from my electronics trash drawer and got excellent agreement between the instruments. Comparative Examples 3340a and Fluke: 20.5 and 20.4 ohms; 27.0 vs 27.4 ohms; 101.2 vs. 101.2 ohms; 147.5 vs. 147.6 ohms; 986 vs. 986 ohms; 51.1 vs. 51.1kΩ; 730 versus 729K ohms. These resistance values differed by only 0.1% on average. On average, my 3340a accuracy is better than the range specified in the product documentation. UPDATE 03/10/2020: I had a chance to test the rev counter on the grass. a lawn mower fitted with a tachometer connector (for the "RPM" function) and a high voltage spark plug wire for inductive gripping with the "CON" function. I compared the readings from the 3340a using a SunPro digital speedometer and a GTC505 ignition analyzer with a capacitive probe. With both direct "RPM" and inductive "CON" connections, the 3340a's RPM averages appear to match SunPro and GTC505 standards. However, the 3340a provided very erratic and intermittent readings, making it difficult to determine the average number of revolutions per eye. (With the "CON" function I had to halve the speed because the lawn mower sprays two sparks per cycle in 4 cycles.) The "DIS" function delivered confusing results. Maybe Innova needs to add some simple averaging or smoothing scheme. tachometer jump. You may need to add some basic filtering circuitry to deal with electrical noise from ignition systems. In any case, the tachometer functions need a little improvement to make the display easier to read. This gauge is an excellent and accurate gauge for basic electrical functions and is very well designed. I hope Innova do what they need to do to improve the tachometer's features and make it the great gauge it deserves, even if they have to raise the price a bit.