📄 digital_volt_and_ambere_meter_eng.htm
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<td width="100%" bgcolor="#800000"><p align="center"><em><font color="#FFFF00"
face="Arial"><big><strong>Digital Volt and Ampere meter</strong></big></font></em></td>
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<td width="100%"><p align="center"><img
src="Digital_voltmeter.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/Digital_V_A_meter/Digital_voltmeter.gif" width="766" height="464"
alt="Digital_voltmeter.gif (16018 bytes)"></td>
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<td width="100%"><p align="center"><img
src="Digital_ambermeter.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/Digital_V_A_meter/Digital_ambermeter.gif" width="765" height="463"
alt="Digital_ambermeter.gif (15633 bytes)"></td>
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<td width="100%"><p align="center"><img
src="Digital_block_supply.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/Digital_V_A_meter/Digital_block_supply.gif" width="759" height="273"
alt="Digital_block_supply.gif (7826 bytes)"></td>
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<td width="100%"><font FACE="Arial" SIZE="2" COLOR="#800000"><p ALIGN="JUSTIFY">Even if
the digital multimeters 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.</font></p>
<font FACE="Arial" SIZE="2" COLOR="#800000"><b><p>Adjustments</b> </p>
<p ALIGN="JUSTIFY"><strong><u>Voltmeter</u></strong>: 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. </p>
<p ALIGN="JUSTIFY"><strong><u>Amperemeter</u></strong>: 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 朓N, 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 ambermeter. 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. </p>
</font><p ALIGN="JUSTIFY"><font color="#FF0000"><strong><small>Feature</small> </strong></font></p>
<p ALIGN="JUSTIFY"><font FACE="Arial" SIZE="2" color="#FF0000">V in maximum: 100V [99.9V]</font></p>
<font FACE="Arial" SIZE="2"><p ALIGN="JUSTIFY"><font color="#FF0000">A in maximum: 10A
[9.99A]</font></p>
<p ALIGN="JUSTIFY"><font color="#FF0000">Max. measurement Voltage Error: 100mV</font></p>
<p></font><font FACE="Arial" SIZE="2" color="#FF0000">Max. measurement Ampere Error: 100mA</font><ul>
<li><small><a href="digital_volt_and_ambere_meter_gr.htm" tppabs="http://users.otenet.gr/~athsam/digital_volt_and_ambere_meter_gr.htm"><font color="#FF0000"><strong>Digital
Volt and Ampere meter in Greek</strong></font></a></small></li>
</ul>
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<td width="33%" bgcolor="#FFFF80"><p align="center"><font face="Arial" color="#800000"><small><strong>Part
List</strong></small></font></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">R1=680Kohms</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">C1-5=10nF</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">IC2-4=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"
target="_blank"><strong>CA3161E</strong></a> Intersil-Harris</font></small></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">R2-6=1Mohms</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">C2-6=47uF 16V</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">IC5=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"
target="_blank"><strong>7805</strong></a></font></small></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">R3=6.8Kohms</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">C3-7-10-11=100nF</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">GR1=4X 1N4001</font></small></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">R4-7=270 ohms</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">C4-8=220nF 1%</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">Q1......6=<a
href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm" target="_blank"><strong>BC557</strong></a></font></small></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">R5=0.1 ohms 5W</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">C9=2200uF 25V</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><font face="Verdana"><small>DS1......6=</small><font
size="1"> <a href="SG_clock_display_conn.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/SG_Clock/SG_clock_display_conn.gif" target="_blank">7Segment
Display common anode</a></font></font></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">RV1-4=50Kohms trimmer
10 turns</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">C12=10uF 16V</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">T1=230VAC/6VAC 1A</font></small></td>
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<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">RV2-3=5Kohms trimmer 10
turns</font></small></td>
<td width="33%" bgcolor="#FFF2EC"><small><font face="Verdana">IC1-3=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"
target="_blank"><strong>CA3162E</strong></a> Intersil-Harris</font></small></td>
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<td width="100%"><p align="center"><small><strong><font face="Westminster" color="#FF0000">Sam
Electronic Circuits </font></strong><font color="#FF0000" face="Arial"><small><small>3/02</small></small></font></small></td>
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