Fluke 9640A Series, Instruction Manual

Page: 67 / 324

Local Operation
Screen Controls and Indicators
3
3-19
Reference Soft Keys
For the Leveled Sine function, the Instrument user interface also supports a Reference
Frequency, a Reference Level or a Reference Point (Frequency and Level).
References may be an output setting that the user might need to return to frequently
during a calibration application, perhaps to check or adjust for stability.
Two soft keys,
Go to Reference
and
Set as Reference
, give immediate access to the
reference and can be pressed at any time. The
Go to Reference
soft key sets the output
of the Instrument to the existing reference settings. The
Set as Reference
soft key
transfers the current settings to establish a new reference setting. Both soft keys result in
the display of Reference Settings and their application to the output, unchanged or
updated dependent upon which key was pressed (see the following Monitoring the
References screen).
ead21f.bmp
Monitoring the References
Note that the message
Reference Frequency and Level Active
appear when the
Go to
Reference
soft key is pressed.
W
Caution
The reference settings could be a substantially different than
the previous Level and/or Frequency output settings, and, if
inadvertently applied, the resulting change in output signal may
damage the load. To protect against this, the user may elect to
switch to Standby as a Reference Preference prior to
confirming the switch to the reference settings. Setting
Reference Switching Preferences is described later in this
chapter.
Switching of the Output signal to match the reference settings
is otherwise immediate, and a Reference Active message is
displayed.
Reference settings are not editable on this screen, no adjustment of output level or
frequency can be made. New reference settings are established via the
Set as Reference
soft key only.