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281, 282, 284
Users Manual
choose to change the output level or the offset to produce a signal which is not clipped.
The word (clip?) will show in the display beside AMPLITUDE or DC OFFSET
while the clipped condition exists.
ERROR messages are shown when an illegal setting is attempted, most generally a
number outside the range of values permitted. In this case the entry is rejected and the
parameter setting is left unchanged, as in the following three examples:
1. Entering a frequency of 1 MHz for a triangle waveform. The error message:
Frequency out of range for the selected waveform is shown.
2. Entering an amplitude of 25 V pp. The error message:
Maximum output level exceeded is shown.
3. Entering a DC offset of 20 V. The error message:
Maximum DC offset exceeded is shown.
The messages remain on the display for approximately two seconds. The last two
messages can be viewed again by pressing the last error… soft-key on the
UTILITY screen.
Each message has a number and the full list appears in appendix B.
The default set-up is for all warning and error messages to be displayed and for a beep to
sound with each message. This set-up can be changed on the error… menu on the
UTILITY screen. The error menu is shown below:
error beep: ON
error message: ON
warn beep: ON
warn message: ON
Each feature can be turned on and off with alternate presses of the associated soft-key;
the factory default is for all features to be on. If the setting is changed and is required for
future use it should be saved by changing the POWER ON SETTING on the
power on… menu of the UTILITY screen to restore last setup.
SYNC Output
SYNC OUT is a multifunction CMOS/TTL level output that can be automatically or
manually set to be any of the following:
waveform sync: A square wave with 50 % duty cycle at the main waveform
frequency, or a pulse coincident with the first few points of
an arbitrary waveform. Can be selected for all waveforms.
position marker: Can be selected for arbitrary waveforms only. Any point(s)
on the main waveform may have associated marker bit(s)
set high or low. When the MAIN OUT waveform is a
standard waveform position marker is not available
and this choice on the list automatically becomes
phase zero; if selected, phase zero produces a
narrow (1 clock) pulse at the start of each standard
waveform cycle.
5-6
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