EZ Digital OS-3060D Instrucciones de operaciones descargar pdf (Pagina 20)

matic triggering is that signals below 25 Hz and

complex signals may not trigger the time base

reliably enough. In this case, immediately switch

to NORM mode in order to obtain a "stable"

image again.

In the TV-V and TV-H switch positions, the trig-

ger signals are routed via a ﬁlter in the trigger

circuit (see also Figure 7). The polarity of the TV

sync signals must be negative to obtain the best

possible results.

Choosing the point at which triggering starts

Use the SLOPE switch (26) located on the shaft of

the LEVEL knob to decide the point at which

triggering starts: on the positive-going or nega-

tive-going transition of the trigger signal, see

also Figure 8-C.

Setting the trigger LEVEL

Use the trigger LEVEL knob to stabilise the signal

so that it can be observed more accurately. The

effect of adjusting the trigger level is shown in

Figure 8. The "-", "0" and "+" markers are refer-

red to the zero crossing of the signal waveform

or the negative and positive area. If the trigger

signal rises or falls extremely steeply, as in the

case of rectangular-pulse or digital signals, no

clear reversal of the displayed trace will be ap-

parent until the LEVEL knob has reached its most

negative or most positive point by turning it to

the left or right, at which point the display runs

away (in the AUTO position) or disappears ent-

irely (NORM position).

2.2.7 Addition and subtraction of signals

In this operating mode of a dual-trace oscillo-

scope, the signals that are applied are "com-

bined" with each other and displayed as a trace.

Addition gives the algebraic sum of CH 1 and CH

2 and subtraction gives the algebraic difference

of the two channels.

Set up the oscilloscope as follows in order to use

these functions:

1. Perform the basic settings as described under

heading 2.2.5.

2. Make sure that both the VOLTS/DIV switches

are set to the same position and that both the

VARIABLE knobs (14) and (15) are set to the

right-hand stop (cal. = calibrated) and are

pushed in. If the difference in the ampli-

tude of the two applied signals is too large,

adjust the two VOLTS/DIV controls so that

both amplitudes take up the entire height of

the screen.

3. Use the channel that has the higher ampli-

tude as the trigger source.

4. Set the MODE switch (18) to the ADD position.

The result is the algebraic sum of both the

signals in CH 1 and CH 2.

(positive) (+)

rise

(-) (negative)

fall

(+) Start

with rise

(-) Start

with fall

8-A Sawtooth pulse

Positive edge

Negative edge

(-) Start

with fall

Stable positive

edge (+)

Negative edge

with jitter (-)

(+) Start with

positive edge

8-B Square-wave pulse

8-C Trigger level (LEVEL)

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 43 44

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EZ Digital OS-3060D Instrucciones de operaciones Pagina 20

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