Review on 🔌 CrocSee AC 80-260V 100A CRS-022B Multimeter with LCD Display: Current Voltage Power Energy & More by Mike Wachtel

Installation Warning: This meter is not safe with its voltage terminals connected directly to AC terminals or to a circuit breaker. It is not UL listed or NEC compliant! There is no short circuit protection if the board fails or arcs and can catch fire unless external low current fuses (125-250mA 250V+) are installed as the main circuit breaker will not trip before the boards and flimsy connecting wires burn. Note: The connection diagram on the Revain page is not perfect: L (Live) and N (Neutral) are swapped. Terminals 2 and 3 are actually connected internally and in the diagram shown the current transformer is at L, better left at N. This is a digital meter based on the V9811A power meter chip (see datasheet if interested). ). It measures active power and averages voltage and current. There is an option for electronic calibration, but perhaps the manufacturer does not do this, so the accuracy of the readings is within 2-3%. This is the ideal device for monitoring the power consumption of an air conditioner, dryer or electric range - any load that uses a two wire connection to AC 120V or 240V and has a current transformer input. Sometimes it is desirable to control current sharing (typical US residential wiring) and this is also possible if you run both live wires in opposite directions through a current transformer to sum the phase currents. A and phase B, and connect the voltage inputs between neutral and one of the phases. Another option is to order two current transformers and connect them in parallel. Just 100A may not be enough to monitor the entire house (maximum power is 12kW). Working with split phase also introduces some problems in interpreting the results: for 120V instruments the current reading is correct, but for 240V instruments the current is correct. is shown as double the actual current, but the power is shown correctly. This is a typical problem with split-phase measurements. It would be nice if there were a measuring device with two current transformers that could display the currents for each phase separately and calculate the total power from the sum of the currents. That's why it only gets 4 stars.