2 Operating Your Frequency Counter
104 Keysight 53150A/151A/152A Operating Guide
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 (Keysight 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 30.
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.
NOTE
Always terminate each setting you change in a menu option by pressing the
Enter key. You can abort any change while the Menu is displayed by pressing the
Reset/Local key or the Clear key. Both keys nullify the change you made to the
current menu option, but they do not affect any of the other menu options. The
Clear key terminates the current menu session, but the Reset/Local key does
not.
NOTE
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.
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