3-12-5. AM Mode (model 8022 only)
Model 8022 offers additional capability to the basic
function generator by allowing amplitude modulation
(AM) of its output waveform (carrier). Placing the func-
tion generator in AM mode modifies output amplitude to
that obtained by the amplitude-carrier (AMPL-CARR)
relationship. Modulating signal is applied to the AM IN
connector. Operator may select any of the available out-
put waveforms as carrier. Frequency and amplitude lim-
its of the modulating signal should be observed.
The Model 8022 is placed in AM operating mode when
the light next to AM illuminates.
3-13. TRIGGERING THE PULSE GENERATOR
Selecting one of the available triggering modes is simply
a matter of depressing push-buttons in the TRIGGER
section until the light next to the desired mode illumi-
nates. When no light in the TRIGGER MODE section is
on, the function generator operates in its normal continu-
ous mode.
The instrument may operate in one of the following trig-
gering modes:
GATED - An external signal enables the generator. First
output pulse is synchronous with the active slope. Last
pulse is always completed.
TRIGGERED - Each input cycle, at the TRIG INPUT
connector, generates a single output pulse. Output pulse
is synchronous with the active slope.
The Model 8020, when set to a trigger mode, accepts
various stimulants. When operating from an external
source, the generator may be programmed to be triggered
on a leading edge of a TTL level signal.
When external source is not available, the operator has
a choice of either using the MANUAL push-button or the
internal trigger generator. The MANUAL button simu-
lates an external signal. If the generator is placed in
GATED mode, an output signal will be available as long
as the MANUAL push-button is depressed. When the gen-
erator is set to TRIG (triggered) mode, each time the
MANUAL button is depressed a single output waveform
is generated. The MANUAL push-button has no effect in
normal mode of operation or when the instrument is set to
internal trigger mode.
To use the internal trigger generator first set the re-
quired trigger period. Place the generator in TRIG mode
and depress in sequence the [2nd] and the [INT TRIG]
push-button in the TRIGGER group. The INT TRIG light
under the numeric display illuminates; indicating that the
generator is placed in internal trigger mode. Repeating the
sequence of depressing [2nd] and [INT TRIG] turns off the
INT TRIG light and places the instrument in normal trig-
ger mode.
3-14. USING FRONT PANEL SET-UPS
Setting-up all parameters in a versatile instrument such
as the Model 8020 takes some time. The set-up time is
longer when a couple of tests are involve and more than
one set-up is required. The function generator incorpo-
rates a battery backed-up non-volatile memory that pre-
serves stored information for a long time. The size of the
non-volatile memory permits storage of up to 30 com-
plete front panel set-ups. Front panel set-ups can be re-
called one at a time. The generator also employs a special
recall mode which permits automatic scrolling through
the stored set-ups. Operator may select scrolling in an
ascending or descending order.
3-14-1. Store Set-ups
First modify the front panel parameters as necessary to
perform your tasks. Parameter modification procedure
is discussed in paragraph 3-8. When all parameters are
set and checked, proceed with storing this set-up as fol-
lows:
1. Depress in sequence the [2nd] and [STO] push-button
and observe that the display is modified to indicate the
following:
S xx
“S” means that the instrument is placed in store mode.
“xx” indicates the number of the present storage cell.
Numbers may range from 00 to 30. Depressing [2nd] re-
moves the generator from store set-up mode and leaves
front panel settings unchanged.
2. To program individual memory cells to specific front
panel set-ups depress the MODIFIER [x1 UP] or [x1
DOWN] until the desired number is displayed. Depress-
ing [EXE] locks-in the entire front panel set-up for later
usage. The instrument then resumes normal its opera-
tion.
3. Repeat the above procedure for as many set-ups that
are required. Stored front panel set-ups are limited to 30.
Model 8020 Operating Instructions
Page 3-11
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