Reference Oscillator (Ref Osc) - Agilent Technologies 53151A Operating Manual

NOTE
NOTE
Chapter 2 Operating Your Frequency Counter
Using the Menu
Some of the menu items listed on the previous page provide information
only (no settings are required [or possible] for these), such as Battery
Voltage, Operation Hours, and information that identifies the Counter
(Agilent model number, firmware version number, serial number, and
installed option codes). These menu options are described in the
remainder of this chapter and also in "The Front Panel Menus at a
Glance" on page 1-4.
Always terminate each setting you change in a menu option by pressing
the key. You can abort any change while the Menu is displayed by
Enter
pressing the
Reset/Local
you made to the current menu option, but they do not affect any of the
other menu options. The
but the key does not.
Reset/Local

Reference Oscillator (REF OSC)

By default, the Counter uses its internal 10 MHz reference oscillator
(or the optional Oven Timebase, Option 001) as a timebase for all
measurements, unless REF OSC is set to EXT, and it detects a 1, 2, 5, or
10 MHz reference signal on the Reference connector on the back panel.
If an external reference signal is present, you can force the Counter to use
the internal reference oscillator by setting the REF OSC menu option
to INT.
The available settings are EXT (external) and INT (internal), and the
default setting is INT.
When REF OSC is set to internal (INT), the Counter outputs a 10 MHz,
1 V p-p signal on the Reference connector on the back panel.
2-42
key or the key. Both keys nullify the change
Clear
key terminates the current menu session,
Clear
Operating Guide