How to choose multi-function power meter
To choose a multi-function power meter, we need to follow the following five requirements. I believe that with the introduction of the following content, you will have more skills in the future selection of power meters.
1. Multi-function power meter size. The size of the meter, this is a very basic problem. The DRO is installed in the cabinet, so the overall coordination should be considered. It may not be too big, too small, and does not see the display number. In addition, the bulky instrument is generally highly scalable, and the same function may be expensive. The function of the instrument is poor. At present, the digital international standard size surface plates are as follows: 48 * 24mm 48 * 48mm outer 48 * 96 mm; 72 * 72 mm; 96 * 96 mm; 96 * 48 mm outside; 16 0 * 80 mm.
2. Digital display. This is directly related to the measurement accuracy of the digital display, generally, the number of higher display digits, more accurate measurement, the price is more expensive, mainly the following: two (spec 99), three (999, very few) three Half a year (1999, ordinary DRO mainstream); four and a half (); four quarters (3999); five and more (common counters, tables, and accumulated high-end instrumentation), users can Choose several digital forms based on the required measurement accuracy.
3. Input signal. Refers to the direct input signal to the measuring instrument. This signal is a direct use of some industrial measuring instruments. Some signals are converted by accessing the instrument. You must figure out the nature of the measured signal. Otherwise, the instrument cannot be used to purchase or even damage the instrument and Original equipment. To clarify the type of the number: current or voltage, AC or DC pulse signal or linear signal, etc., but also calculate the size of the signal. The name of the instrument and the input signal are not the same concept.
4. Working power supply. All DROs require working power, digital display power supply: 220VAC; 110/220VAC; switching power supply 85-265VAC/DC, 24VDC (general order), 5VDC (small panel meter).
5. The function of the meter. The meter function is generally modular, optional, the function of the instrument is different, the price will be different, the digital display has the following optional functions: alarm function and alarm output group number (ie, relay output), feed Electric power output voltage machine size and power output, transmission output and transmission output (4-20mA or 0-10V, etc.) type, communication output and communication method and protocol (RS485 or RS232 interface, Modbus or other protocol), for Adjust and control the meter and even more optional features.
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