Lambda SR1, Operation Manual, Page: 17 / 317

Getting Started 17
© 2014 Stanford Research Systems
Unit Entries
The Unit Entry is a type of control used extensively throughout SR1 that allows entry of numeric data in
a range of different units. The example below shows the generator amplitude control for example. When
the down-arrow is clicked, a the current value of the
entry is shown in the drop-down list expressed in each of the allowed units. Selecting a different unit
makes it the current unit for subsequent entries. To enter a new value into a unit entry first click
anywhere on the current text, and then enter a new numeric value followed by an optional modifier
character. The allowed modifiers are:
Character Modifier Numeric Value
f femto
x10
-15
p pico
x10
-12
n nano
x10
-9
u micro
x10
-6
m milli
x10
-3
k kilo
x10
3
M mega
x10
6
G giga
x10
9
T tera
x10
12
(Note that the front-panel keypad contains dedicated keys for the unit-modifiers just to the right of the
Enter key.) To complete the entry press the "Enter" key on the front panel or an external keyboard. To
abort the entry press the "Esc" key on the keypad or keyboard.
Sometimes the precision of the value represented by a unit entry may exceed the number of digits
displayed. To see the value of any unit entry displayed with full double precision hold the cursor over the
unit entry— the full double precision value will be shown as a "hint."
Unit Displays
Unit Displays are the controls with a black background and green text which are used to display
measurement results and other quantities whose value can't be changed by the user. As with unit
entries, the units of the unit display can be changed by using the mouse or trackpad to click on the
at the right of the control and select a unit from the drop-down list. Right-clicking the Unit Display brings
up a menu which offers some more options: