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PERFORMANCE TESTS
Introduction
The performance tests described in this section
are designed to verify with a high degree of confi-
dence that the unit is performing within the
specifications.
The results of each test may be recorded on the
test sheet at the end of this section.
[HARDKEYS]
The keypad consists of five groups of hardkeys.
The ENTRY keys are used to enter numeric
parameters which have been highlighted by a soft-
key. The MENU keys select a menu of softkeys.
Pressing a menu key will change the menu boxes
which are displayed next to the softkeys. Each
menu groups together similar parameters and
functions. The CONTROL keys start and stop
actual data acquisition, select the cursor and
toggle the active display. These keys are not in a
menu since they are used frequently and while dis-
playing any menu. The SYSTEM keys print the
screen to a printer and display help messages.
Once again, these keys can be accessed from any
menu. The AUTO keys are perform various auto
functions and can be accessed from any menu.
Hardkeys are referenced in braces like [HELP].
<Softkeys>
The SR850 has a menu driven user interface. The
6 softkeys to the right of the video display have dif-
ferent functions depending upon the information
displayed in the menu boxes along the right edge
of the screen. In general, the softkeys have two
uses. The first is to toggle a feature on and off or
to choose between settings. The second is to high-
light a parameter which is then changed using the
knob or numeric keypad. In both cases, the soft-
keys affect the parameters which are displayed
adjacent to them.
Softkeys are referenced in brackets like
<Ref. Frequency>.
7-1
Knob
The knob is used to adjust parameters which have
been highlighted using the softkeys. Most numeric
entry fields may be adjusted using the knob. In
addition, parameters such as sensitivity and time
constant use the knob as well. In these cases, the
knob function is selected by the softkeys. The
[CURSOR] key, which can be pressed at any time,
will set the knob function to scrolling the cursor.
Preset
Throughout this section, it will be necessary to
preset the lock-in into a known default state. To do
this, turn the power off. Turn the power back on
while holding down the [←] (backspace) key. The
unit will perform power up tests and then assume
the default settings. Each test generally starts with
a preset. This procedure will be referred to as
{PRESET}.
Serial Number
If you need to contact Stanford Research
Systems, please have the serial number of your
unit available. The serial number is printed on a
label affixed to the rear panel. The serial number
is also displayed on the screen when the unit is
powered on.
The serial number can also be displayed by
pressing
[SYSTEM SETUP]
<Hardware Test >
<More>
<Screen Test>
Firmware Revision
The firmware revision code is displayed on the
screen when the unit is powered on. The revision
code is also displayed with the serial number in
the Screen Test described above.