2
Operating Your Instrument
116
Keysight 53147A/148A/149A Operating and Programming 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 instrument (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
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 rms
signal on the Reference connector on the back panel.
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