Table 3-3. Note that the modifier buttons [x1], [x10] and
[x100] can only modify a parameter within one range.
These buttons in conjunction with the [RANGE] push-
button may cover the entire specified range.
3-10. SELECTING AN OUTPUT WAVEFORM
Selecting one of the available output waveforms is done
by depressing one of the two push-buttons in the OUT-
PUT section until the light next to the required waveform
illuminates. Models 8020 and 8022 each output six dif-
ferent waveshapes through the OUTPUT connector.
These waveforms are:
SINE WAVE POSITIVE SQUARE WAVE
TRIANGLE NEGATIVE SQUARE WAVE
DC SQUARE WAVE
Model 8021 offers eight additional waveforms DC
waveform is omitted:
PULSE
PULSE COMPLEMENT
POSITIVE PULSE
POSITIVE PULSE COMPLEMENT
NEGATIVE PULSE
NEGATIVE PULSE COMPLEMENT
RAMP
INVERTED RAMP
3-11. DISABLING THE OUTPUT
The Model 8020 features a stand-by mode which discon-
nects the waveform from the output connectors. The
stand-by function is especially useful in places where the
output is constantly connected to the device under test
and where modification of waveform parameters may
endanger this device.
To place the instrument in its stand-by mode depress in
sequence the [2nd] and the [ST BY] push-buttons. The se-
lected waveform light turns off; indicating that the output
signal is disconnected from the connectors.
To resume normal operation simply depress one of the
push-button in the OUTPUT section. The light next to the
previously selected waveform illuminates; indicating that
the output signal in now connected to the output connec-
tors.
3-12. SELECTING AN OPERATING MODE
Model 8020 may operate as a function generator, as a
sweep generator and as a voltage controlled oscillator.
Selecting one of these operating modes is done by press-
ing one of the push-buttons in the MODE section until
the light next to the desired mode illuminates.
In addition, Model 8021 offers pulse operating mode.
Model 8022 offers AM mode. When all lights in the mode
section are off, the generator is placed in its normal func-
tion generator mode.
3-12-1. Function Generator Mode
Function generator mode is the normal operating condi-
tions where the output waveform is programmed to have
various parameters. These parameters are stable
throughout the continuous operation of the generator.
The generator is placed in its normal operating mode
when all light in the MODE section are off.
3-12-2. Sweep Generator Mode
Placing the model 8020 in sweep mode transforms this
instrument into an independent sweep generator. The
function generator has eight built-in sweep modes of
which four of them are linear sweep modes and four are
logarithmic sweep modes. Selecting between linear or
logarithmic sweep mode is performed as follows:
1.
Depress the [2nd] push-button and observe that the
display is modified to indicate the following:
2nd ?
(? appears flashing)
2.
Depress the [LIN/LOG] push-button in the DIS-
PLAY/MODIFY group and observe that the LOG light
below the numeric display illuminates; indicating that
the generator is set to sweep having a logarithmic scale.
3. Repeating the sequence of depressing [2nd] and
[LIN/LOG] push-buttons turns the LOG light off. The
instrument then sweeps linearly.
3-12-2-1. Selecting Sweep Direction
When placed in sweep mode, the selected waveform at
the output connector repeatedly changes its frequency in
a direction set by the sweep start (FREQ) parameter to
frequency set by the sweep stop (STOP) parameter. The
time for completing one sweep cycle is determined by
the sweep time (TIME) parameter. There are four differ-
ent directions that the output waveform may sweep to.
The difference between the various modes is more sig-
nificant when using the triggered sweep mode as de-
scribed in the following:
Model 8020 Operating Instructions
Page 3-9
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