Stanford Research Systems SR865A Operation Manual page 109

Chapter 3 Operation 91
To change a setting, touch the setting (shown within a dark gray tile) to either toggle the
selection or highlight it for keypad entry. The Enter { } button advances to the next
entry tile in a section. For more information about using the computer interfaces see the
Remote Programming chapter.
General Settings
Time and Date
Touch the {h} button in the Time section to highlight the hours setting. Use the keypad or
{↑} and {↓} buttons to set the hour of day in 24 hour format. The time will highlight in
orange indicating that the display is not the current time but rather the time that will be
set. Continue to enter the minutes and seconds then touch {set} to commit the time to the
internal clock. Repeat this process for the date.
The time and date are used to label data files and screen shots as well as saved settings.
10MHz Timebase
The SR865A can accept an external 10 MHz timebase input on the rear panel. This
allows the internal reference frequency of the SR865A to remain frequency and phase
stable with other SR865A units on the same timebase.
When set to Internal the external timebase input is ignored. When set to Auto, the
SR865A will automatically lock to an external timebase whenever a 1 Vrms 10 MHz
signal is detected at the timebase input. If the external timebase signal drifts out of range
(either in amplitude or frequency) this setting will revert to Internal.
The LED is on when the unit is locked to an external timebase.
Ext 10 MHz
The SR865A can also output its own 10 MHz timebase to another unit.
Sounds
Sounds can be toggled from On to Mute. These are primarily the key and knob clicks but
also includes various other notification sounds.
SR865A DSP Lock-in Amplifier