Stanford Research Systems SR785, Operating Manual And Programming Reference

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3-26 Status Indicators
SR785 Dynamic Signal Analyzer
box. This allows the effect of various choices to be compared while making the
selection. Press [Enter], the same softkey, another softkey or a menu key to un-highlight
the menu box when finished.
List selection may also be made using the numeric keys. The choices are numbered 0
through 9. Press a number key to make a selection. If [Enter] is not required, the new
selection immediately appears in the menu box. If [Enter] is required, the new selection
appears when [Enter] is pressed.
If no menu box is highlighted, pressing a numeric entry key automatically selects the
most recently modified parameter within the menu and begins numeric entry. This is
convenient when a measurement requires a single parameter within a menu (or menus) to
be modified repeatedly.
Numeric Values
Parameters with numeric values display their current value in their menu box. Examples
of numeric parameters are <Span>, <# Avgs> and <Ch1 Input Range>. Some numeric
values are ‘continuous’, such as <# Avgs>, while others can only have discrete values,
such as <Span>.
To enter a new value, press the softkey to highlight its menu box. The parameter value is
displayed in the entry field at the top of the screen. For example, to change the Span,
press [Freq] for the menu and then <Span> (1st softkey). The <Span> menu box will be
highlighted and the current Span value will be shown at the top of the screen.
The numeric entry keys are used to enter values directly. For example, to set the Span to
12.8 kHz, press [1] [2] [.] [8]. As soon as the [1] is pressed, the entry field shows the new
value as it is entered. The list of appropriate units is displayed as well.
The entry field displays the characters as the keys are pressed. The '_' is the entry point.
If an error is made, the backspace [<-] key will erase the last character. Pressing the same
softkey again (or another softkey to modify another parameter) will abort the entry
operation and leave the value unchanged. Use the knob to select the (kHz) units. When
the entry value is correct and the correct units are selected, press [Enter] to change the
span to the new value.
Entries may be made in exponential form using the [Exp] key. The entry above may be
made by pressing [1] [2] [.] [8] [Exp] [3] and selecting the (Hz) units.
Numeric entry always requires [Enter] to enter the new value.
Some menu boxes have 'Marker' as one of the units choices. If 'Marker' is selected as the
units, the analyzer ignores the numeric keys pressed and substitutes the current marker
value in the entry field.
If no menu box is highlighted, pressing a numeric entry key automatically selects the
most recently modified parameter within the menu and begins numeric entry. This is
convenient when a measurement requires a single parameter within a menu (or menus) to
be modified repeatedly.