EZ Digital OS-3060D Instrucciones de operaciones descargar pdf (Pagina 28)

2.3 Taking measurements using Oscilloscopes

OS-3020 D and OS-3060 D

2.3.1 Amplitude measurements

A fundamental distinction is made between two

types of voltage measurements when using an

oscilloscope:

- Measurement of peak-to-peak voltage without

any reference to polarity, and

- Measurement of the instantaneous values of a

voltage referred to a basic reference (polarity

related).

If you want to perform one of these two types of

measurement, make certain that the VARIABLE

knobs are pushed in and calibrated (right-hand

stop, latched-in).

1. Peak-to-peak voltages

To measure such voltages, proceed as follows:

a) Set up the oscilloscope according to 2.2.1

(default settings of switches and knobs)

b) Set the TIME/DIV switch so that two to three

cycles of the signal are visible on the screen

with the VOLTS/DIV switch turned to the left-

hand stop (5 V/div).

c) Use the Vertical position switch (25) to move

a negative peak of the signal as close as

possible to the vertical centre line (the line

with the ﬁne graduation marks = 0.2 DIV).

d) Move the signal onto a horizontal graticule

line by using one of the Horizontal position

switches (16) or (17) depending on the input

to which the signal is applied.

e) You can then determine the peak-to-peak

voltage:

Count the "boxes" between the negative and

positive peak of the signal and multiply them

by the VOLTS/DIV setting.

Example:

If you counted 4.2 divisions and the VOLTS/DIV

switch is set to 1 V/DIV, the voltage is therefore

4.2 DIV x 1 V/div = 4.2 V pp.

f) If X5 expansion is switched on, you must divide

the determined value by 5, if a 1:10 probe is

connected, you must multiply the result by 10.

g) In the case of sine-wave signals below 100 Hz

and rectangular-pulse signals below 1000 Hz,

set the AC/DC/GND switch of the relevant

channel to DC in order to prevent measuring

errors.

Warning!

Make certain that a periodic quantity is not

superimposed on a very high zero-frequency

quantity. It is crucial not to exceed the maximum

permissible input values.

Fig. 14. Determination of peak-to-peak voltage

Fig. 15. Measurement of direct voltage

2. Measurement of direct voltage

To determine a direct voltage, proceed as follows:

a) Set up the oscilloscope according to 2.2.1.

b) Set the AC/GND/DC switch of the channel in

which the signal is present to GND.

100

Reference line (base) Deflection

4 DIV

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 43 44

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EZ Digital OS-3060D Instrucciones de operaciones Pagina 28

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