Instruction manual

Chapter 4 Command Reference

[:SENSe]:FUNCtion Subtree

4-30 Programming Guide

[:SENSe]:ROSCillator Subtree

This subtree controls the Reference Oscillator.

COMMAND [:SENSe]:ROSCillator:SOURce . . . <character_program_data>

Sets or queries the current reference timebase to INTernal or EXTernal.

QUERY RESPONSE A sequence of ASCII-encoded bytes: INT or EXT

COMMENTS • *RST: INT

• INTernal indicates the timebase is the internal reference. EXTernal

indicates the signal at the external reference input (located on the rear

panel of the Counter; Reference connector) is the reference timebase.

• The Counter does not switch to EXTernal unless a suitable 1, 2, 5, or

10 MHz signal is present on the “Reference” connector on the back panel.

• Execution of the command (that is, explicitly selecting internal or

external timebase) sets [:SENS]:ROSC:SOUR:AUTO to OFF.

• If this is set to EXT, and no valid external signal is available at the

back-panel Reference connector, the front-panel frequency display may

show an error message.

• If this is set to INT, the 10 MHz signal generated by the internal

reference oscillator is available as an output on the back-panel

Reference connector.

FRONT-PANEL

KEYS

Shift + Menu (REF OSC > INT | EXT)