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NOTE
The frequency may be increased
quickly,
us-
ing the above method, but no similar action is
"
available to rapidly reduce the frequency set-
ting.
Example 3: Setting
the
Output Amplitude
This
step sets the amplitude of the existing waveform to a
value of IOmVp-p:
Use
the
cursor down key to set the amplitude range so it
indicates 0.02Vp-p (20mVp-p). Rotate the
AMlTD
knob
u n t i l the
scope indicates IOmVp-p.
Example
4:
Changing
the Output to a Square W a v e
This example changes the output to a square wave with
variable duty cycle, while maintaining the present fre-
quency,
in
continuous mode.
1. Press
FCTN twice to indicate a square wave output.
Note that the output waveform
has
equal time-on
and time-off.
2. Press DUTY
VAR
to allow variable duty
cyde
(LED
on). Rotate the associated knob below the key to
cre-
SECTION
2
Getting Stnrted
ate square waves with different on- and off-times.
Leave the square wave in some extreme variable po-
sition; that is,
an
obviously unequal
on-
or off-time.
3. Press
DUTY
VAR key again. The scope presentation
reverts to a square wave with equal on- and off-
times.
4. Press the
DUTY
VAR key again. The scope should
display the unequal duty cycle from the previous
step.
Example 5: Adjust
the DC Offset
This
step adjusts the
DC
offset value based on the center-
line (zero or average) voltage level of the existing
waveform.
I. Press the DC
OFFSET
key
(LED
on). Rotate the asso-
ciated knob
and
note
the
vertical movement of CH
A
on the scope. This movement corresponds directly
with the offset voltage applied by the rotation of
the
knob. Leave the signal with a sigruficant offset and
go to the next step.
2. Press
DC
OFFSETagain (LED off). The scope presen-
tation reverts to the original value of zero offset.
Press the key again and the offset value re-appears
and the CH A display moves off zero. Press the key
once more to return the scope to zero offset (LED
0fO.
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