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Electronic Measurement Industrial Electronics - College - Dong Thap Vocational College - 10


- Place the positive probe ) to point D and the negative probe to E.

(VOLTS/DIV; TIME/DIV; POSITION); INTENSITY; FOCUS; TRIGLEVEL....

- Adjust the knobs on the oscilloscope:


To get a standing wave on the oscilloscope screen, record the amplitude value h 1 (cell) in table 5 below.

- Keep the adjustment knobs on AF 1) and oscilloscope 3).

- Next, place the positive probe ) to point F and record the value h2 cell) in table 1


Table 1:



U DF (v)


h 1 (cell)


h 2 (cell)

R h 1 R ( )

1 hour 2 hours

2

1.5




2




2.5




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Electronic Measurement Industrial Electronics - College - Dong Thap Vocational College - 10

* Measuring capacitor capacitance using oscilloscope:

- From the output (OUT – PUT) of the AF source, a sinusoidal signal with an effective amplitude of 2V is taken out, determined by a VOM) with a frequency of 1KHz as shown in the figure.

Connect the circuit as shown in figure 2.



AF SOURCE


Positive probe



Osilloscope

I




70


- Place the positive probe ) to point I and the negative probe to .

(VOLTS/DIV; TIME/DIV; POSITION); INTENSITY; FOCUS; TRIGLEVEL....

- Adjust the knobs on the oscilloscope:


To get a standing wave on the oscilloscope screen, record the amplitude value h 1 (cell) in table 2 below.

- Keep the adjustment knobs on AF 1) and oscilloscope 3).

- Next, place the positive probe ) to point K. Observe and record the value of h 2

cell) in table 2.

- Change the frequency of the sine wave from source AF 1): f = 1500Hz – 2000Hz and repeat the above measurement steps. Record the results h 1 , h 2 (cells) in table 6.

Table 2:


U DF (v)

h 1 (cell)

h 2 (cell)

C h 1 . 1 . ( F)

1 h R

2

1.5




2




2.5





* Measuring inductance with oscilloscope:

- From the output (OUT – PUT) of the AF source, a sinusoidal signal with an effective amplitude of 2V is taken out, determined by a VOM) with a frequency of 1KHz as shown in the figure.

Connect the circuit as shown in figure 3.

AF SOURCE

Positive probe

Osilloscope

A

R

h1

OUTP UT

J

B

L

h2

Y

A

Y

B

(1)

(2)

F

(3)

Sound meter


Choose R = 39 or 18 or 82


Figure 3


- Place the positive probe ) to point A and the negative probe to B.

(VOLTS/DIV; TIME/DIV; POSITION); INTENSITY; FOCUS; TRIGLEVEL....

- Adjust the knobs on the oscilloscope:


To get a standing wave on the oscilloscope screen, record the amplitude value h 1 (cell) in table 3 below.

- Keep the adjustment knobs on AF 1) and oscilloscope 3).

- Next, place the positive probe ) to point F. Observe and record the value of h 2

cell) in table 3.

Table 3:



U DF (V)


h 1 (cell)


h 2 (cell)

C h 1 . 1 . ( F)

1 h R

2

1.5




2




2.5




- Observe the square wave on the oscilloscope.

REFERENCES


Reference documents:

- Nguyen Ngoc Tan, Ngo Tan Nhon, Ngo Van Ky - Measurement Engineering - Ho Chi Minh City University of Technology, 2000.

- Phan Ngoc Bich, Engineer Phan Thanh Duc, Engineer Tran Huu Thanh - Textbook of electrical measurement - electrical machines - electrical instruments, School of Electrical Engineering - Power Company 2 - Ho Chi Minh City, 2000.

- Nguyen Van Hoa - Measurement and measuring devices - Education Publishing House, 2000.

- Nguyen Van Hoa, Electrical and non-electrical measurement techniques , Education Publishing House

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- Nguyen Hoa Cong, Measurement Engineering , Hanoi National University Publishing House

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