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Dspl01e - Exp 2

The document outlines the operation verification of a digital to analog converter, detailing the necessary requisites, instruments, and components involved. It includes a topographical diagram, a table of obtained results comparing calculated and measured output voltages, and a section for experimentation and troubleshooting. Additionally, it poses questions related to the converter's resolution and output voltage based on binary input values.

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Kenji Trentado
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22 views4 pages

Dspl01e - Exp 2

The document outlines the operation verification of a digital to analog converter, detailing the necessary requisites, instruments, and components involved. It includes a topographical diagram, a table of obtained results comparing calculated and measured output voltages, and a section for experimentation and troubleshooting. Additionally, it poses questions related to the converter's resolution and output voltage based on binary input values.

Uploaded by

Kenji Trentado
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Unit N.

2: Digital/Analog converter
Purposes: Verify the operation of a digital to analog converter

Requisites: Acquisition of Lessons 1 and 2 of Module DL 3155M21R (Theoretical


guide)

Instruments: Digital multimeter


Cable set

Digital/Analog converter
Electrical Diagrams

Fig. 2.1

Components List
16 resistances 330-1/4W-5%
8 green LED diodes 3mm
8 red LED diodes 3mm
N1 = AD570
8 slide switches SLG1201

Calculation data
Output voltage = decimal value · quantum
Quantum = FRS/2n , i.e. 10V/28

Topographical diagram

Fig. 2.2

Obtained Results (FSR=2.56 V)

Digital Inputs Analog Output


Binary Uo [V]
Hexadecimal Decimal
76543210 Calculated Value Measured value
00000000 00 0 0 0.01
00000001 01 1 0.01 0.02
00000010 02 2 0.02 0.03
....
00001111 0F 15 0.15 0.16
00010000 10 16 0.16 0.17
....
01111111 7F 127 1.27 1.29
10000000 80 128 1.28 1.29
....
11000000 C0 192 1.92 1.93
....
11111111 FF 255 2.55 2.57
00000011 03 3 0.03 0.04
00000100 04 4 0.04 0.05
00000101 05 5 0.05 0.06
00010001 11 17 0.17 0.18
00010010 12 18 0.18 0.18
00010011 13 19 0.19 0.19

Tab. 2.1

EXPERIMENTATION
insert the Module DL 3155M21R in the console and set the main switch to ON;
carry out the connections like in Fig.2.2;
connect the digital voltmeter 1 between jacks Uo and GND (Fig.2.2);
set all the deviators to “L”;
calculate for all the values of the input bits shown in Tab.2.1 the output voltage and write the
values in the same table;
measure the eventual offset voltage present in output; this voltage is a mistake that is common
to all the following measurements, so it will have to be subtracted to the measured values, to
obtain the true value of the conversion;
set the deviators “H” according to the digital codes written in Tab.2.1;
write the values read on the multimeter in Tab.2.1;
compare the calculated values with the measured ones;
comment the results.

QUESTIONS
An 8 bit D/A converter, with a full scale value if 10V, presents a resolution of:

Answer:
1.25 %
125 %
3.9 %

0.03 %
The greatest is the bit number of a converter the lower is its resolution:

True
Answer:
False
At a D/A converter, with fs value = 10V, the binary number 10000000 is applied in input,
which is the value of the output voltage?
5V

4V
Answer:
3.5 V

3V

TROUBLESHOOTING
Push the INSERT button to insert the fault in the circuit.
Repeat the operations in the EXPERIMENTATION section to find the fault inserted in the
circuit.
Which is the fault ?

DB3 output interrupted

Not supplied converter


Answer:
Converter output interrupted

B2 input interrupted
Remove all the connections.

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