3-7-4. IEEE-488 Errors
In general, whenever a GPIB programming attempts to
put the model 8020 into an error condition, the function
generator responds in two ways. First by displaying a
front panel message and than, if programmed so, by rais-
ing an SRQ flag in its status byte. The controller may then
address the generator using the serial poll command and
request its status byte.
The generator incorporates a number of display mes-
sages which are associated with errors involving GPIB in-
terface programming. These messages are discussed in de-
tail in Section 4 of this manual.
There is one message however, which should be ex-
plained at this point because it may interfere with front
panel operation. A remote enable or a device dependent
command sent to the instrument through the bus turns the
REMOTE light on. In this case, all front panel push-but-
tons except [LCL] are disabled. Press one of these push-
buttons causes the function generator to respond with the
following message:
LcL
This message indicates that the instrument expects that
the [LCL] push-button be first depressed otherwise front
panel operation is ignored. After the [LCL] button is de-
pressed, the REMOTE light turns off and the instrument is
ready to accept further front panel programming se-
quences.
Unless the [LCL] push-button is pressed and the RE-
MOTE light turns off.
3-8. SELECTING 2nd FUNCTIONS
A few front panel push-buttons were assigned a secon-
dary function. These functions are printed in yellow be-
low the button and are accessible through the [2nd] push-
button.
There are twelve front panel buttons whih were as-
signed a secondary function. These functions are:
ADR STO
EXE SWP MODE
OFST COMPLEMENT
LIN/LOG ST-BY
INT TRIG RCL MODE
RCL DCL
The operation of these secondary functions is described
later in this chapter. Pressing the [2nd] push-button gen-
erates the following display read-out:
2nd ?
The question mark (?) appears blinking; indicating
that the instrument is ready for a consequent press of an-
other push-button which was assigned a secondary func-
tion. Depressing [2nd] once more cancels this function.
3-9. MODIFYING PARAMETERS
There are various parameters, such as frequency and am-
plitude, which control the shape of the waveform at the
output connector. Modification of a specific parameter
is simply done by pressing the push-button below the re-
quested parameter until the light next to the required pa-
rameter illuminates. At this time the numeric readout
displayed a value plus an exponent. The dimension is
marked on the panel next to each parameter. For exam-
Window Amplitude Offset
Range Range
+/-7.50 V 1.0E 0 -15.0E 0 0E 0 - 7.00 E 0
+/-2.37 V 48E 0 - 150E 0 0E 0 - 2.13 E 0
+/-750 mV .10E 0 - .47E 0 0E-3 - 700 E-3
+/-237 mV 10E-3 - 150E-3 0E-3 - 232 E-3
Tabel 3-2. Offset Amplitude Programming Limits
Model 8020 Operating Instructions
Page 3-7
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