Fluke DDS Function Generator 271, User Manual

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271
Users Manual
4-4
Numeric entries are automatically confirmed when the appropriate unit key (
Hz
,
kHz
,
MHz
, etc.) is pressed but
ENTER
can be used to enter a number in the parameter’s basic
units or to confirm entries with fixed units (e.g. phase) or no units (e.g. burst count). It is
also used to confirm certain options when prompted.
Pressing
ESCAPE
returns a setting being edited to its last value; a second press (when
appropriate) will return the display from an edit menu to the main menu.
CE
(Clear Entry) undoes a numeric entry digit by digit.
Further explanations will be found as appropriate in the detailed descriptions of the
generator’s functions.
Principles of Editing
FIELD
and
DIGIT
keys are used, together with the rotary control, to edit parameters
shown on the current menu. The main menu shows all the basic generator parameters and
is the one displayed unless editing of a special function has been selected. These edit
menus are accessed by pressing the
EDIT
key, followed by the appropriate
MODE
key
or a numeric key which has a secondary function printed in red to the right of the numeric
digit.
FIELD
keys move the flashing edit cursor forward or backwards from one editable field
to the next; all the digits of a numeric parameter value are treated as a single field. When
the parameters of a particular function occupy two or more pages of the display, e.g. the
sweep mode parameters, the further pages are indicated by
MORE>>>
shown in the
display. In this case the
FIELD
keys also step between the last field on one page and the
first field on the next, and back again.
The attributes of the flashing edit cursor can be changed by the user if desired, as
described in chapter 12,
System Operations .
DIGIT
keys operate in more than one mode. When a numeric parameter value field is
selected by the
FIELD
keys,
DIGIT
keys step the edit cursor forwards or backwards
through the digits of the field. When the edit cursor is positioned in a parameter name
(for example
FREQ
) pressing either digit key will step the parameter through each of the
alternative forms in which a value may be entered (for example,
FREQ
changes to
PER
iod). The parameter's numeric value and units change accordingly.
Note that where there is no alternative form for the parameter (for example,
SYMMETRY
)
the edit cursor cannot be stepped into that field. When the edit cursor is positioned in a
parameter selection field (for example,
SOURCE =
on the
TRIG
menu), the
DIGIT
keys step through all possible choices for that parameter (in this example,
SOURCE = TGEN
,
SOURCE = EXT
, etc.).
Lastly, when the edit cursor is positioned in the units field of a parameter value, the
DIGIT
keys increment or decrement the numeric value of the parameter by a factor of 10
on each press; the units change each time the display autoranges.
The
ROTARY CONTROL
works as follows. With the cursor in any field other than a
numeric value field turning the control acts in exactly the same way as pressing the
DIGIT
keys. With the edit cursor positioned anywhere in a parameter numeric field,
turning the control will increment or decrement the value; the step size is determined by
the position of the edit cursor within the numeric field.
Thus for
FREQ = 1.00000 MHz
rotating the control will change the frequency in
1 kHz steps. The display will auto-range up or down as the frequency is changed,
provided that autoranging permits the increment size to be maintained; this will in turn
determine the lowest or highest setting that can be achieved by turning the control. In the
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