8. Following the option message, the instrument pro-
ceeds with displaying the previously selected GPIB pri-
mary address. If GPIB option is not installed the instru-
ment skips this message. The GPIB address is set by front
panel programming and is stored in the non-volatile
memory. For example, with the generator programmed
to address 15, the display will show:
IE15
9. Following these display messages, the instrument will
commence its normal operating mode and begin gener-
ating waveforms. Note that the instrument is equipped
with a non-volatile memory. This memory automat-
ically monitors front panel traffic and retains its latest
set-up for events such as accidental power loss. In case of
power loss the instrument resumes operation with its
previously programmed front panel set-up.
It is possible to remove the sequence of displayed mes-
sages from the power up procedure by using a built-in shift
function. Depressing [SHIFT] and then [RANGE UP] in
sequence writes a special code to the non-volatile mem-
ory. The next time the generator is powered up, the instru-
ment will skip the power up procedure and will immedi-
ately commencewith displaying the front panel set-up. re-
peating the sequence of [SHIFT] and [RANGE UP] re-
stores normal power up procedure. Other shift functions
are described later in this section.
3-5. SOFTWARE RESET
One, who is not yet fully familiar with front panel opera-
tion of the function generator, may find himself locked
into a “dead-end” situation where nothing operates the
way it should. The fastest way of restoring the generator
to a known state is by resetting its software. This may be
done by pressing the [2nd] push-button and then press-
ing the [DCL] push-button (second function to the
[RANGE DOWN] push-button). The instrument then
resets to it’s factory selected defaults. Table 3-1 summa-
rizes these defaults.
3-5-1. Parameter Preset
As discussed in paragraph 3-5, software reset places all
front panel parameters at their factory selected defaults.
It may however be required to preset one or two parame-
ters and leave the rest untouched. In that case the instru-
ment provides additional capabilities with its [P.SET]
(preset) function. Depressing simultaneously the
[RANGE UP] and the [RANGE DOWN] push-buttons
modifies the displayed parameter to its preselected de-
fault value. Defaults values are summarized in Table 3-
1.
FUNCTION DESCRIPTION DEFAULT STATE
FREQ Frequency 10.00 KHz
AMPL Amplitude 1.00 V
OFST Offset 0.00 V
WID Pulse/Ramp Width 10.0 S
CARR Carrier Level 100 %
STOP Sweep Stop Frequency 2.00 KHz
TIME Sweep Time 1.00 S
T.PER Internal Trigger Period 1.00 S
MARK Sweep Marker Frequency 5.00 KHz
DC AMPL DC Amplitude 0.00 V
2nd Functions OFST Offset Mode Off
LIN/LOG Sweep Mode Linear
INT TRIG Internal Trigger Mode Off
SWP MODE Sweep Mode Sweep up
ST. BY Stand By Off
STATUS IEEE Status Local
DISPLAY/MODIFY Displayed Parameter Frequency
TRIGGER Trigger Mode Continuous
MODE Operating Mode Normal
OUTPUT Output Waveform Sinewave
Table 3-1. Default States After Software Reset
Model 8020 Operating Instructions
Page 3-5
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