250A true effective value 300Hz high frequency current sensor full frequency current transmitter output 4-20mA

Using precision constant current technique and linear temperature compensation technology, the process of non control variables (consumption) linear isolation is converted into standard variable DC signal output for DC3V3.3V4V5V10V4-20ma20ma PLC or DCS DSP, or MCU, acquisition card, SCM paperless recorder data acquisition system provides a standard current signal for data conversion of A/D pretreatment

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250A 真有效值300hz高频电流传感器全频率电流变送器输出4-20ma是在电流传感器诸如电流互感器、霍尔电流传感器、罗氏线圈等电流传感器后端加上调理电路，将交流信号变为直流信号，直流信号的幅值与交流信号的有效值成正比。调理电路的基本原理从有效值的定义出发，将信号在一个或多个周期内进行方均根运算。现有专门由于真有效值转换的芯片。定义：交流电流的有效值（RMS）等于在同一电阻性负载回路中，与其产生等热量的直流电流的大小。

纯正弦波。要测量真有效值，可以采用JLKA系列的真有效值电流变送器，它可以检测电流中的真有效值，对失真的电流波形进行精确检测，避免普通平均值式电流变送器的失真。说明一点，普通电流变送器是“用平均值的转换方法，用有效值标定的电流变送器”。在波形是正弦波的时候，检测是准确的，但波形失真时，就会产生误差。利用真有效值电流变送器JLKA8，是目前广泛采用的产品

（1）直有效值与有效值之间的处别：有效值是：交流电压一周内的电压、电流转换成直流电压、电流等效计算出来，这样在电压表、电流表刻上表记，所以把交流电压、电流叫有效值。（2）现在可控硅整流、变频器的应用，它是通过移相来调电压，它出来的电压已经不是正弦波，如果用原来电表的刻度读出来已不精确了。现在又有一种新电压表、电流表来精确核算有效值。这就是真有效值测量。250A 真有效值300hz高频电流传感器全频率电流变送器输出4-20ma

1. when alternating current is used, the heat generated by the resistance is associated with the average current in a circumferential wave. The square of the square is proportional to it.

Heat and current generated by 2. square is proportional to the average value, that is to say the average current value and the square root after the value is proportional to the effective value

3. for a pure sine wave, the effective value is 0.707 times the peak value (or the peak value is 1.414 times that of the effective value). For example, the effective value is a pure sinusoidal current of 1 amperes, with a peak current of 1.414 amperes.

4. the average is the peak. 0.636 times the value, or 0.9 times the value of the value.

5., when measuring a pure sine wave (only for pure sine wave), it is easy to measure the average value (0.636 times the peak value) and multiplied by the wave factor 1.111 (0.707 times peak value). The obtained value is completely correct.

这个数值也被称为有效值。这种方法被广泛用于所有的模拟测量仪（此时平均值是靠线圈运动的惯性和阻尼作用来实现的）和所有旧式、仪表和大多数电流表数字万用表上。这种技术被称为“平均测量，按有效值标定”的测量方法。这种测量方法只适用于纯正弦波，而在现实的电气装置中，往往不存在250A 真有效值300hz高频电流传感器全频率电流变送器输出4-20ma

		JLBA-21 AC400A/4-20ma + -12v			Hall Current Sensor
work environment	ambient temperature		-25℃～+80℃	Storage temperature		-40℃～+115℃
	relative humidity		≤90%	Pressure condition		Normal atmospheric pressure
Electrical parameters	Rated current range		AC400A	Error nonlinearity		0.1%
	Output current		DC4-20ma 0.2FS %	Measuring current range		AC500A
	Internal resistance of secondary coil		@85℃ 50Europe	Turn ratio		1/4000
	Working power supply		±12V--±18V +-10%	Power waste		20+Ipx ma
	Measurement of internal resistance		1000A+ 15V20 Euro	Measurement of internal resistance		1000A+ 24V65 Euro
	Misaligned current temperature drift		@-40-85℃≦±0.5ua/℃	Following precision		greater than100A/us
	Zero point offset current		@-40-85℃≦±0.2ma/℃	Linearity		@Ipo=0±Ipn≦0.1%FS
	response time		@100A/us 10-90% ≦1us	bandwidth		0-3Db 0-100khz
Mechanicsparameter	First wear core		35MM	Shape size		1009034mm
	Two terminal		Pin	Life		greater than10Ten thousand hours
	Shell		PBTFlame retardant material	Potting		EpoxyEpoxy resin adhesive
	weight		450G	tolerance		±0.3mm
	Offset current		@Ipo ≦±0.1ma	Magnetic misalignment current		@Ipo=±Ipn-0 ≦±0.1ma

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250A true effective value 300Hz high frequency current sensor full frequency current transmitter output 4-20mA