Warnings and Error Messages
Two classes of message are displayed on the screen when an illegal combination of parameters
is attempted.
WARNING messages are shown when the entered setting causes some change which the user
might not necessarily expect. Examples are:
1.
Changing the amplitude from, for example, 2·5 Volts pk
−
pk to 25mV pk
−
pk brings in the
step attenuator; if a non
−
zero offset has been set then this will now be attenuated too. The
message
DC OFFSET CHANGED BY AMPLITUDE
will be shown temporarily on the
screen but the setting will be accepted; in this case the actual, attenuated, offset will be
shown in brackets below the set value.
2.
With the output level set to 10V pk
−
pk, increasing the DC offset beyond ± 5V will cause
the message
DC LEVEL MAY CAUSE CLIPPING
.
The offset change will
be accepted (producing a clipped waveform) and the user may then choose to change the
output level or the offset to produce a signal which is not clipped.
(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. Examples are:
1.
Entering a frequency of 2MHz for a triangle waveform. The error message:
Frequency too high for the triangle wave
is shown
.
2.
Entering an amplitude of 25Vpp. The error message:
Number too high – value unchanged
is shown.
The messages are shown 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, see
System Operations section.
Each message has a number and the full list appears in Appendix 1.
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.
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