Digital ammeters and voltmeters

Ammeters are devices that are used to determine the strength of current in the circuit. Digital modifications are made on the basis of Comparators. Accuracy they differ. It is also important to note that the devices can be installed in circuits with both constant and alternating current. Design type distinguished panel meters, portable and built-in modifications. The appointment is pulsed and phase-sensitive devices. In a separate category highlighted selective models. In order to study in more detail in the devices, it is important to know the device ammeter.

Conventional digital ammeter circuit includes a comparator together with resistors. To convert the voltage applied to the microcontroller. It is most commonly used with reference diodes. Stabilizers are installed only in the selective modifications. To increase the accuracy of measurements used broadband filters. Phase devices are equipped with transceivers.

To collect digital ammeter with your hands is quite difficult. Primarily this will require a qualitative comparator. Parameter sensitivity must be not less than 2.2 microns. The minimum resolution required it to maintain at the level of 1 mA. The microcontroller in the device is set with a reference diode. The display system attached to it through the filter. Further, in order to collect digital ammeter with your own hands, you need to install the resistors. Most often they're getting dial-up type. The shunt in this case should be the comparator. The division ratio of the device depends on the transceiver. If we talk about a simple model, it uses a dynamic type. Modern devices are equipped with high-precision analogues. The constant current source can be conventional battery Li-ion type. 

The resistors used in the device is a dial-up type. The stabilizer in this case is not provided. The triode has only one. Directly current conversion is pretty fast. For home use, this device fits well. Filters to increase the accuracy of the measurement provided.

If we talk about the parameters of the voltmeter–ammeter, it is important to note that the operating voltage is 12 V. the current Consumption in this case is equal to 0.5 A. the Minimum resolution of the presented device is 1 mA. Shunt resistance is around 2 Ohms.

The division ratio of the voltmeter-ammeter is only 0.7. Maximum resolution of this model is 15 mA. The process of the current conversion takes about 340 MS. Permissible error specified device is located at the level of 0.1 %. The minimum pressure the system can withstand a 12 kPa.

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