ZMPT107

ZMPT101B(ZMPT107) voltage transformer operating guide 1、Wiring diagram FigureⅠ Figure Ⅱ 2、Determination of maximum output rms voltage Umax： Umax is decided by the AD peak voltage in the sampling loop in principle. Peakvoltag e As for Bipolar AD，Umax= 2 peak voltage As for unipolar AD，Umax= 2 2 for example: As for ± 5V AD，the maximum rms voltage of the transformer: Umax = 5V / 2 =3.53V As for 0~3.3V AD，the maximum rms voltage of the transformer:V max = 3.3V / 2 2 =1.16V 3、Determination of input current-limiting resistor R′ Current-limiting resistor R′= V I V：Rated input voltage I ： Rated operating current （ when Coil resistance is compared with current-limiting resistor R′ , it can be ignored.） ZMPT101B/ZMPT107 usually working at rated current:1~2mA. When Rated input voltage≤100V ， Usually choosing the operating current I=2mA; When Rated input voltage≥220V，To reducing the resistor power， Usually choosing the operating current 1 mA ≤I≤2 mA. for example: V=100V，I=2 mA， R′= V =50K Ω I for example: V=220V，I=1.1mA， R′= V =200 kΩ I To improve reliability, the current-limiting resistor selected usually is greater than its 4times the rated power, and generally use a high temperature coefficient metal film resistor. 4、Determination of the sampling resistor R VR = V R= outputmax outputmax I Vinputmax for example: Voutput max =3.53V，Vinput max =120V， R′ =50 kΩ Directions: R= 3.53 ×50 k Ω =1.471 kΩ 120 (1) Above formula is also suitable for the two ways of a...