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Digital Volt Ampere Meter |
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Even if the digital multimeter have dominated in a lot of applications, in the measurement, exist the need for existence of instruments of clue in various appliances, voltage and current, as in power supply or elsewhere. The circuits that give make this precisely the work, measure the voltage in terminal a circuit and the current that passes in his. The circuit does not present particular difficulties for somebody that has a small experience. The two circuits are the himself, with a small difference only in their input, when they have they measure voltage or current and in connection that concern decimal point [ dp ]. In the department of input IC1 and IC3, exist the CA3161E, that is a A/D Converter for 3-Digit Display. In the drive of Display IC2 and IC4, exist CA3161E, that is a BCD the Seven Segment Decoder/ Driver. As it appear in Fig.1, that concern the voltmeter in input [ + IN ], exist in series a what resistor R1 in combination with the R3 create a voltage divider. On the contrary in the Fig.2 that it concern the ampere meter, this resistor does not exist, because the circuit is connected differently, thus the current pass through the R5, creating a fall of voltage, in her terminal, proportional current that it pass from this.
Voltmeter: Short circuit in the input, pins 10 and 11 [IC1] and we regulate the RV1, until we take clue in the Display, zero in all the digits. We rectify and connect in the input a external voltage roughly 900mV. With the RV2, we regulate so that we take the clue 900mV in the Display. At the same time, we check this voltage with a external multimeter, of good quality and precision.
Amperemeter: Short circuit in the input, pins 10 and 11 [IC3] and we regulate the RV4, until we take clue in the Display, zero in all the digits. We rectify and we connect in + IN point, provided that we place in series with the positive pole, of battery, a resistor 10R/10W and in the –IN, a new battery 9V. We regulate the RV3 so that we take clue in the Display 0.90A. We check simultaneously the correctness of measurement with a external digital amperemeter. A point that it should we are careful, the capacitors C4 and C9, it should they are very good quality. Also the various in the placement of resistors R4 and R7. of connection two circuits, for measurement voltage and current, appear in the Fig.3. The power supply that is public for two circuits appears in the Fig.4. If exist suitable constant supply in the appliance in which will be placed permanently the circuits, then can remove the T1 and bridge GR1 and is connected this voltage, in point A. The IC5 good is placed in heatsink.
Feature
V in maximum: 100V [99.9V]
A in maximum: 10A [9.99A]
Max. measurement Voltage Error: 100mV
Max. measurement Ampere Error: 100mA
Part List
R1=680Kohms C1-5=10nF IC2-4=CA3161E Intersil-Harris
R2-6=1Mohms C2-6=47uF 16V IC5=7805
R3=6.8Kohms C3-7-10-11=100nF GR1=4X 1N4001
R4-7=270 ohms C4-8=220nF 1% Q1......6=BC557
R5=0.1 ohms 5W C9=2200uF 25V DS1......6= 7Segment Display common anode
RV1-4=50Kohms trimmer 10 turns C12=10uF 16V T1=230VAC/6VAC 1A
RV2-3=5Kohms trimmer 10 turns IC1-3=CA3162E Intersil-Harris
Related Links
Downloads
Digital Volt Ampere Meter - Link
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